$STGW
Stagwell Inc Stock $stgw

$stgw Overview Financials Valuation SEC Filings Company Website

2020 Q1 Form 8-K Financial Statement

#000087688320000024 Filed on August 31, 2020

Income Statement

Concept	2020 Q1	2019 Q1	2019
Revenue	$327.7M	$328.8M	$1.416B
YoY Change	-0.32%	-78.28%	-4.02%
Cost Of Revenue	$222.7M	$237.2M	$961.1M
YoY Change	-6.1%	-2.42%	-3.04%
Gross Profit	$105.0M	$91.64M	$454.7M
YoY Change	14.63%	-92.79%	-6.03%
Gross Profit Margin	32.05%	27.87%	32.12%
Selling, General & Admin	$66.40M	$67.10M	$328.3M
YoY Change	-1.04%	-20.02%	-5.94%
% of Gross Profit	63.21%	73.22%	72.21%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$9.206M	$8.838M	$25.13M
YoY Change	4.16%	5.19%	-7.3%
% of Gross Profit	8.76%	9.64%	5.53%
Operating Expenses	$75.50M	$75.90M	$366.7M
YoY Change	-0.53%	-21.18%	-7.23%
Operating Profit	$29.33M	$15.68M	$79.46M
YoY Change	87.01%	-207.17%	5441.14%
Interest Expense	-$30.40M	-$11.30M	-$56.19M
YoY Change	169.03%	-50.22%	-37.79%
% of Operating Profit	-103.66%	-72.06%	-70.72%
Other Income/Expense, Net	-$14.03M	-$14.70M	-$58.59M
YoY Change	-4.54%	-34.08%	-34.97%
Pretax Income	$15.29M	-$88.67M	$20.87M
YoY Change	-117.25%	-203.08%	-123.53%
Income Tax	$13.50M	$29.62M	$10.32M
% Of Pretax Income	88.28%		49.44%
Net Earnings	$1.002M	-$113.0K	-$5.253M
YoY Change	-986.73%	-99.62%	-95.96%
Net Earnings / Revenue	0.31%	-0.03%	-0.37%
Basic Earnings Per Share	-$0.03	-$0.04
Diluted Earnings Per Share	-$0.03	-$0.04	-$75.98K
COMMON SHARES
Basic Shares Outstanding	72.40B shares	57.22M shares	69.13M shares
Diluted Shares Outstanding	72.40B shares	57.22M shares	69.13M shares

Balance Sheet

Concept	2020 Q1	2019 Q1	2019
SHORT-TERM ASSETS
Cash & Short-Term Investments	$221.1M	$26.40M	$106.9M
YoY Change	737.5%	-9.59%	246.36%
Cash & Equivalents	$221.1M	$26.37M	$106.9M
Short-Term Investments
Other Short-Term Assets	$44.69M	$44.69M	$35.61M
YoY Change	0.0%	23.2%	-70.67%
Inventory
Prepaid Expenses
Receivables	$406.2M	$438.6M	$479.4M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$694.8M	$568.2M	$622.0M
YoY Change	22.26%	2.8%	5.44%
LONG-TERM ASSETS
Property, Plant & Equipment	$75.77M	$85.46M	$304.7M
YoY Change	-11.34%	0.1%	245.48%
Goodwill	$716.4M	$742.8M
YoY Change	-3.55%	-10.78%
Intangibles	$50.64M	$64.86M
YoY Change	-21.92%	-2.25%
Long-Term Investments		$6.586M
YoY Change		2.24%
Other Assets	$29.62M	$26.13M	$115.1M
YoY Change	13.37%	-16.8%	-2.68%
Total Long-Term Assets	$1.165B	$1.265B	$1.206B
YoY Change	-7.9%	10.15%	18.07%
TOTAL ASSETS
Total Short-Term Assets	$694.8M	$568.2M	$622.0M
Total Long-Term Assets	$1.165B	$1.265B	$1.206B
Total Assets	$1.860B	$1.833B	$1.828B
YoY Change	1.45%	7.76%	13.45%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$153.5M	$214.7M	$200.1M
YoY Change	-28.51%	5.9%	-9.84%
Accrued Expenses	$373.8M	$295.4M	$402.2M
YoY Change	26.54%	1.86%	28.6%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$720.5M	$729.0M	$819.6M
YoY Change	-1.17%	-2.63%	10.38%
LONG-TERM LIABILITIES
Long-Term Debt	$1.014B	$919.1M	$887.6M
YoY Change	10.36%	-2.52%	-6.98%
Other Long-Term Liabilities	$35.52M	$17.52M	$274.6M
YoY Change	102.72%	-68.25%	161.8%
Total Long-Term Liabilities	$1.050B	$936.6M	$1.162B
YoY Change	12.09%	-6.16%	9.74%
TOTAL LIABILITIES
Total Short-Term Liabilities	$720.5M	$729.0M	$819.6M
Total Long-Term Liabilities	$1.050B	$936.6M	$1.162B
Total Liabilities	$2.008B	$1.959B	$2.059B
YoY Change	2.48%	6.7%	7.08%
SHAREHOLDERS EQUITY
Retained Earnings	-$479.7M	-$465.0M
YoY Change	3.16%	25.48%
Common Stock	$99.59M	$98.69M
YoY Change	0.91%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	-$223.7M	-$214.5M	-$230.8M
YoY Change
Total Liabilities & Shareholders Equity	$1.860B	$1.833B	$1.828B
YoY Change	1.45%	7.76%	13.45%

Cashflow Statement

Concept	2020 Q1	2019 Q1	2019
OPERATING ACTIVITIES
Net Income	$1.002M	-$113.0K	-$5.253M
YoY Change	-986.73%	-99.62%	-95.96%
Depreciation, Depletion And Amortization	$9.206M	$8.838M	$25.13M
YoY Change	4.16%	5.19%	-7.3%
Cash From Operating Activities	-$19.96M	-$81.20M	$86.54M
YoY Change	-75.42%	33.04%	400.8%
INVESTING ACTIVITIES
Capital Expenditures	$1.546M	$3.606M	$18.60M
YoY Change	-57.13%	-5.08%	-8.23%
Acquisitions	$729.0K	$1.050M	$4.823M
YoY Change	-30.57%		-85.26%
Other Investing Activities	$0.00	$293.0K	-$484.0K
YoY Change	-100.0%	324.64%	4.31%
Cash From Investing Activities	$16.65M	$18.10M	$115.0K
YoY Change	-8.04%	-567.97%	-100.23%
FINANCING ACTIVITIES
Cash Dividend Paid		$0.00	$56.00K
YoY Change		-100.0%	-71.43%
Common Stock Issuance & Retirement, Net		$0.00	$601.0K
YoY Change		-100.0%	-22.55%
Debt Paid & Issued, Net	$4.608M	$1.536M	$0.00
YoY Change	200.0%	1844.3%
Cash From Financing Activities	$119.6M	$60.75M	-$11.73M
YoY Change	96.93%	27.58%	-154.72%
NET CHANGE
Cash From Operating Activities	-$19.96M	-$81.20M	$86.54M
Cash From Investing Activities	$16.65M	$18.10M	$115.0K
Cash From Financing Activities	$119.6M	$60.75M	-$11.73M
Net Change In Cash	$114.2M	-$2.922M	$76.06M
YoY Change	-4007.22%	-82.79%	-481.48%
FREE CASH FLOW
Cash From Operating Activities	-$19.96M	-$81.20M	$86.54M
Capital Expenditures	$1.546M	$3.606M	$18.60M
Free Cash Flow	-$21.50M	-$84.81M	$67.94M
YoY Change	-74.65%	30.81%	-2376.91%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2020Q3	dei	Amendment Flag AmendmentFlag	false
CY2020Q3	dei	Entity Central Index Key EntityCentralIndexKey	0000876883
CY2020Q3	dei	Entity File Number EntityFileNumber	001-13718
CY2020Q3	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	Z4
CY2020Q3	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	98-0364441
CY2020Q1	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	132174000	USD
CY2018Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	1879000	USD
CY2019Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	3304000	USD
CY2020Q1	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	2111000	USD
CY2019	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	3	reportable_segment
CY2018Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	95000000	shares
CY2020Q1	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	145000000	shares
CY2018Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	95000000	shares
CY2019Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	145000000	shares
CY2020Q1	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	145000000	shares
CY2018Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	95000000	shares
CY2019Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	145000000	shares
CY2020Q1	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	145000000	shares
CY2020Q3	dei	Document Type DocumentType	8-K
CY2020Q3	dei	Document Period End Date DocumentPeriodEndDate	2020-08-31
CY2020Q3	dei	Entity Registrant Name EntityRegistrantName	MDC PARTNERS INC.
CY2020Q3	dei	Entity Address Address Line1 EntityAddressAddressLine1	330 Hudson Street, 10th Floor
CY2020Q3	dei	Entity Address City Or Town EntityAddressCityOrTown	New York
CY2020Q3	dei	Entity Address State Or Province EntityAddressStateOrProvince	NY
CY2020Q3	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	10013
CY2020Q3	dei	City Area Code CityAreaCode	646
CY2020Q3	dei	Local Phone Number LocalPhoneNumber	429-1800
CY2020Q3	dei	Written Communications WrittenCommunications	false
CY2020Q3	dei	Soliciting Material SolicitingMaterial	false
CY2020Q3	dei	Pre Commencement Tender Offer PreCommencementTenderOffer	false
CY2020Q3	dei	Pre Commencement Issuer Tender Offer PreCommencementIssuerTenderOffer	false
CY2020Q3	dei	Security12b Title Security12bTitle	Class A Subordinate Voting Shares, no par value
CY2020Q3	dei	Trading Symbol TradingSymbol	MDCA
CY2020Q3	dei	Security Exchange Name SecurityExchangeName	NASDAQ
CY2020Q3	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
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CY2019Q4	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation Current LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent	0	USD
CY2018Q4	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation Current LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent	35967000	USD
CY2019Q4	us-gaap	Customer Advances Current CustomerAdvancesCurrent	171742000	USD
CY2018Q4	us-gaap	Customer Advances Current CustomerAdvancesCurrent	138505000	USD
CY2019Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	48659000	USD
CY2018Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	0	USD
CY2019Q4	us-gaap	Business Combination Contingent Consideration Liability Current BusinessCombinationContingentConsiderationLiabilityCurrent	45521000	USD
CY2018Q4	us-gaap	Business Combination Contingent Consideration Liability Current BusinessCombinationContingentConsiderationLiabilityCurrent	32928000	USD
CY2019Q4	us-gaap	Liabilities Current LiabilitiesCurrent	819645000	USD
CY2018Q4	us-gaap	Liabilities Current LiabilitiesCurrent	742536000	USD
CY2019Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	887630000	USD
CY2018Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	954107000	USD
CY2019Q4	us-gaap	Business Combination Contingent Consideration Liability Noncurrent BusinessCombinationContingentConsiderationLiabilityNoncurrent	29699000	USD
CY2018Q4	us-gaap	Business Combination Contingent Consideration Liability Noncurrent BusinessCombinationContingentConsiderationLiabilityNoncurrent	50767000	USD
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	219163000	USD
CY2018Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	0	USD
CY2019Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	21584000	USD
CY2018Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	54255000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	4187000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	5329000	USD
CY2019Q4	us-gaap	Liabilities Liabilities	1981908000	USD
CY2018Q4	us-gaap	Liabilities Liabilities	1806994000	USD
CY2019Q4	us-gaap	Redeemable Noncontrolling Interest Equity Fair Value RedeemableNoncontrollingInterestEquityFairValue	36973000	USD
CY2018Q4	us-gaap	Redeemable Noncontrolling Interest Equity Fair Value RedeemableNoncontrollingInterestEquityFairValue	51546000	USD
CY2019Q4	us-gaap	Preferred Stock Value PreferredStockValue	152746000	USD
CY2018Q4	us-gaap	Preferred Stock Value PreferredStockValue	90123000	USD
CY2019Q4	us-gaap	Common Stock Value CommonStockValue	101469000	USD
CY2018Q4	us-gaap	Common Stock Value CommonStockValue	58579000	USD
CY2019Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-480779000	USD
CY2018Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-475526000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-4269000	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	4720000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	-230833000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	-322104000	USD
CY2019Q4	us-gaap	Minority Interest MinorityInterest	40258000	USD
CY2018Q4	us-gaap	Minority Interest MinorityInterest	64514000	USD
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	-190575000	USD
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	-257590000	USD
CY2019Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1828306000	USD
CY2018Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1600950000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	10903000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	-118222000	USD
CY2017	us-gaap	Profit Loss ProfitLoss	256461000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	31040000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	18416000	USD
CY2017	us-gaap	Share Based Compensation ShareBasedCompensation	24350000	USD
CY2019	us-gaap	Depreciation Depreciation	25133000	USD
CY2018	us-gaap	Depreciation Depreciation	27111000	USD
CY2017	us-gaap	Depreciation Depreciation	23873000	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	13196000	USD
CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	19085000	USD
CY2017	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	19601000	USD
CY2019	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	3346000	USD
CY2018	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	3193000	USD
CY2017	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	3022000	USD
CY2019	us-gaap	Asset Impairment Charges AssetImpairmentCharges	8599000	USD
CY2018	us-gaap	Asset Impairment Charges AssetImpairmentCharges	87204000	USD
CY2017	us-gaap	Asset Impairment Charges AssetImpairmentCharges	5471000	USD
CY2019	mdca	Adjustment To Deferred Acquisition Consideration AdjustmentToDeferredAcquisitionConsideration	5403000	USD
CY2018	mdca	Adjustment To Deferred Acquisition Consideration AdjustmentToDeferredAcquisitionConsideration	-374000	USD
CY2017	mdca	Adjustment To Deferred Acquisition Consideration AdjustmentToDeferredAcquisitionConsideration	-4819000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	4791000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	21585000	USD
CY2017	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-173313000	USD
CY2019	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	-3237000	USD
CY2018	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	1867000	USD
CY2017	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	1600000	USD
CY2019	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	352000	USD
CY2018	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	62000	USD
CY2017	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	2081000	USD
CY2019	us-gaap	Increase Decrease In Other Noncurrent Assets And Liabilities Net IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNet	863000	USD
CY2018	us-gaap	Increase Decrease In Other Noncurrent Assets And Liabilities Net IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNet	-392000	USD
CY2017	us-gaap	Increase Decrease In Other Noncurrent Assets And Liabilities Net IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNet	4420000	USD
CY2019	us-gaap	Foreign Currency Transaction Gain Loss Unrealized ForeignCurrencyTransactionGainLossUnrealized	9475000	USD
CY2018	us-gaap	Foreign Currency Transaction Gain Loss Unrealized ForeignCurrencyTransactionGainLossUnrealized	-20795000	USD
CY2017	us-gaap	Foreign Currency Transaction Gain Loss Unrealized ForeignCurrencyTransactionGainLossUnrealized	17637000	USD
CY2019	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	37763000	USD
CY2018	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-31326000	USD
CY2017	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	50030000	USD
CY2019	mdca	Increase Decrease In Expenditures Billable To Clients IncreaseDecreaseInExpendituresBillableToClients	-12236000	USD
CY2018	mdca	Increase Decrease In Expenditures Billable To Clients IncreaseDecreaseInExpendituresBillableToClients	11223000	USD
CY2017	mdca	Increase Decrease In Expenditures Billable To Clients IncreaseDecreaseInExpendituresBillableToClients	-1892000	USD
CY2019	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-3474000	USD
CY2018	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	17189000	USD
CY2017	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-6569000	USD
CY2019	mdca	Increase Decrease In Accounts Payable Accrued Expenses And Other Liabilities IncreaseDecreaseInAccountsPayableAccruedExpensesAndOtherLiabilities	-14077000	USD
CY2018	mdca	Increase Decrease In Accounts Payable Accrued Expenses And Other Liabilities IncreaseDecreaseInAccountsPayableAccruedExpensesAndOtherLiabilities	-18222000	USD
CY2017	mdca	Increase Decrease In Accounts Payable Accrued Expenses And Other Liabilities IncreaseDecreaseInAccountsPayableAccruedExpensesAndOtherLiabilities	13398000	USD
CY2019	us-gaap	Payment For Contingent Consideration Liability Operating Activities PaymentForContingentConsiderationLiabilityOperatingActivities	5223000	USD
CY2018	us-gaap	Payment For Contingent Consideration Liability Operating Activities PaymentForContingentConsiderationLiabilityOperatingActivities	29141000	USD
CY2017	us-gaap	Payment For Contingent Consideration Liability Operating Activities PaymentForContingentConsiderationLiabilityOperatingActivities	42790000	USD
CY2019	mdca	Payments For Proceeds From Cash In Trust PaymentsForProceedsFromCashInTrust	0	USD
CY2018	mdca	Payments For Proceeds From Cash In Trust PaymentsForProceedsFromCashInTrust	656000	USD
CY2017	mdca	Payments For Proceeds From Cash In Trust PaymentsForProceedsFromCashInTrust	709000	USD
CY2019	us-gaap	Increase Decrease In Deferred Revenue IncreaseDecreaseInDeferredRevenue	32934000	USD
CY2018	us-gaap	Increase Decrease In Deferred Revenue IncreaseDecreaseInDeferredRevenue	-14871000	USD
CY2017	us-gaap	Increase Decrease In Deferred Revenue IncreaseDecreaseInDeferredRevenue	14548000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	86539000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	17280000	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	71786000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	18596000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	20264000	USD
CY2017	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	32958000	USD
CY2019	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	23050000	USD
CY2018	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	2082000	USD
CY2017	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	10631000	USD
CY2019	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	4823000	USD
CY2018	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	32713000	USD
CY2017	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	USD
CY2019	us-gaap	Proceeds From Contributions From Affiliates ProceedsFromContributionsFromAffiliates	0	USD
CY2018	us-gaap	Proceeds From Contributions From Affiliates ProceedsFromContributionsFromAffiliates	963000	USD
CY2017	us-gaap	Proceeds From Contributions From Affiliates ProceedsFromContributionsFromAffiliates	3672000	USD
CY2019	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-484000	USD
CY2018	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	776000	USD
CY2017	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	1758000	USD
CY2019	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	0	USD
CY2018	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	146000	USD
CY2018	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	499000	USD
CY2017	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	2229000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	115000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-50431000	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-20884000	USD
CY2019	us-gaap	Payment For Contingent Consideration Liability Financing Activities PaymentForContingentConsiderationLiabilityFinancingActivities	30155000	USD
CY2018	us-gaap	Payment For Contingent Consideration Liability Financing Activities PaymentForContingentConsiderationLiabilityFinancingActivities	32172000	USD
CY2017	us-gaap	Payment For Contingent Consideration Liability Financing Activities PaymentForContingentConsiderationLiabilityFinancingActivities	57083000	USD
CY2019	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	11392000	USD
CY2018	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	13419000	USD
CY2017	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	8865000	USD
CY2019	us-gaap	Payments Of Dividends PaymentsOfDividends	56000	USD
CY2018	us-gaap	Payments Of Dividends PaymentsOfDividends	196000	USD
CY2017	us-gaap	Payments Of Dividends PaymentsOfDividends	284000	USD
CY2019	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	601000	USD
CY2017	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	404000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-11729000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	21434000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-32599000	USD
CY2019	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1000	USD
CY2018	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	77000	USD
CY2017	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-754000	USD
CY2019	mdca	Cash Cash Equivalents Restricted Cash Restricted Cash Equivalentsand Cash Heldin Trusts Including Cash Classified Within Assets Heldfor Sale Period Increase Decrease CashCashEquivalentsRestrictedCashRestrictedCashEquivalentsandCashHeldinTrustsIncludingCashClassifiedWithinAssetsHeldforSalePeriodIncreaseDecrease	74926000	USD
CY2018	mdca	Cash Cash Equivalents Restricted Cash Restricted Cash Equivalentsand Cash Heldin Trusts Including Cash Classified Within Assets Heldfor Sale Period Increase Decrease CashCashEquivalentsRestrictedCashRestrictedCashEquivalentsandCashHeldinTrustsIncludingCashClassifiedWithinAssetsHeldforSalePeriodIncreaseDecrease	-11640000	USD
CY2017	mdca	Cash Cash Equivalents Restricted Cash Restricted Cash Equivalentsand Cash Heldin Trusts Including Cash Classified Within Assets Heldfor Sale Period Increase Decrease CashCashEquivalentsRestrictedCashRestrictedCashEquivalentsandCashHeldinTrustsIncludingCashClassifiedWithinAssetsHeldforSalePeriodIncreaseDecrease	17549000	USD
CY2019	mdca	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Decrease From Cash Classified As Assets Held For Sale CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsDecreaseFromCashClassifiedAsAssetsHeldForSale	4441000	USD
CY2018	mdca	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Decrease From Cash Classified As Assets Held For Sale CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsDecreaseFromCashClassifiedAsAssetsHeldForSale	0	USD
CY2017	mdca	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Decrease From Cash Classified As Assets Held For Sale CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsDecreaseFromCashClassifiedAsAssetsHeldForSale	0	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	76060000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-19938000	USD
CY2017	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	17549000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	30873000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	50811000	USD
CY2016Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	33262000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	106933000	USD
CY2018	us-gaap	Income Taxes Paid IncomeTaxesPaid	3836000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	30873000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	50811000	USD
CY2019	us-gaap	Income Taxes Paid IncomeTaxesPaid	2296000	USD
CY2018	mdca	Adjustmentsto Additional Paidin Capital Changesdueto Business Combinations AdjustmentstoAdditionalPaidinCapitalChangesduetoBusinessCombinations	25550000	USD
CY2017	us-gaap	Income Taxes Paid IncomeTaxesPaid	8099000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	62223000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	64012000	USD
CY2017	us-gaap	Interest Paid Net InterestPaidNet	62895000	USD
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	-257590000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	-5253000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	-5253000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-8602000	USD
CY2019	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	98620000	USD
CY2019	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	0	USD
CY2019	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	601000	USD
CY2019	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	3655000	USD
CY2019	mdca	Increase Decreasein Redemption Valueof Redeemable Noncontrolling Interests IncreaseDecreaseinRedemptionValueofRedeemableNoncontrollingInterests	3160000	USD
CY2019	mdca	Adjustmentsto Additional Paidin Capital Changesdueto Business Combinations AdjustmentstoAdditionalPaidinCapitalChangesduetoBusinessCombinations	1911000	USD
CY2019	us-gaap	Minority Interest Change In Redemption Value MinorityInterestChangeInRedemptionValue	-24733000	USD
CY2019	us-gaap	Stockholders Equity Other StockholdersEquityOther	1142000	USD
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	-190575000	USD
CY2017Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	-159862000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	-130007000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	-130007000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	3713000	USD
CY2018	mdca	Stock Issued During Period Value Convertible Preferred Shares StockIssuedDuringPeriodValueConvertiblePreferredShares	-97000	USD
CY2018	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	776000	USD
CY2018	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	8165000	USD
CY2018	mdca	Increase Decreasein Redemption Valueof Redeemable Noncontrolling Interests IncreaseDecreaseinRedemptionValueofRedeemableNoncontrollingInterests	-4171000	USD
CY2018	us-gaap	Minority Interest Change In Redemption Value MinorityInterestChangeInRedemptionValue	-5965000	USD
CY2018	us-gaap	New Accounting Pronouncement Or Change In Accounting Principle Effect Of Adoption Quantification NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfAdoptionQuantification	-1170000	USD
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	-257590000	USD
CY2016Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	-513063000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	241086000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	241086000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	2275000	USD
CY2017	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	90220000	USD
CY2017	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	0	USD
CY2017	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	1758000	USD
CY2017	mdca	Stock Issued During Period Value Deferred Acquisition Consideration StockIssuedDuringPeriodValueDeferredAcquisitionConsideration	27852000	USD
CY2017	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	8028000	USD
CY2017	mdca	Increase Decreasein Redemption Valueof Redeemable Noncontrolling Interests IncreaseDecreaseinRedemptionValueofRedeemableNoncontrollingInterests	-1498000	USD
CY2017	mdca	Adjustmentsto Additional Paidin Capital Changesdueto Business Combinations AdjustmentstoAdditionalPaidinCapitalChangesduetoBusinessCombinations	-9650000	USD
CY2017	us-gaap	Minority Interest Change In Redemption Value MinorityInterestChangeInRedemptionValue	6960000	USD
CY2017	us-gaap	Noncontrolling Interest Decrease From Deconsolidation NoncontrollingInterestDecreaseFromDeconsolidation	10657000	USD
CY2017	us-gaap	Stockholders Equity Other StockholdersEquityOther	-343000	USD
CY2017Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	-159862000	USD
CY2019	us-gaap	Use Of Estimates UseOfEstimates	<div style="line-height:120%;padding-bottom:8px;text-align:justify;text-indent:24px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-style:italic;">Use of Estimates</span><span style="font-family:inherit;font-size:10pt;">. The preparation of consolidated financial statements in conformity with GAAP requires management to make judgments, estimates and assumptions. These estimates and assumptions affect the reported amounts of assets and liabilities including goodwill, intangible assets, contingent deferred acquisition consideration, redeemable noncontrolling interests, deferred tax assets and the amounts of revenue and expenses reported during the period. These estimates are evaluated on an ongoing basis and are based on historical experience, current conditions and various other assumptions believed to be reasonable under the circumstances. These estimates require the use of assumptions about future performance, which are uncertain at the time of estimation. To the extent actual results differ from the assumptions used, results of operations and cash flows could be materially affected. </span></div>
CY2019	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	<div style="line-height:120%;padding-bottom:8px;text-align:left;text-indent:24px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-style:italic;">Concentration of Credit Risk</span><span style="font-family:inherit;font-size:10pt;">. The Company provides marketing communications services to clients who operate in most industry sectors. Credit is granted to qualified clients in the ordinary course of business. Due to the diversified nature of the Company’s client base, the Company does not believe that it is exposed to a concentration of credit risk. No client accounted for more than </span><span style="font-family:inherit;font-size:10pt;">10%</span><span style="font-family:inherit;font-size:10pt;"> of the Company’s consolidated accounts receivable as of December 31, 2019 or </span><span style="font-family:inherit;font-size:10pt;">December 31, 2018</span><span style="font-family:inherit;font-size:10pt;">. No sales to an individual client or country other than in the United States accounted for more than 10% of revenue for the fiscal years ended December 31, 2019, 2018, or 2017. As the Company operates in foreign markets, it is always considered at least reasonably possible foreign operations will be disrupted in the near term.</span></div>
CY2019Q4	us-gaap	Other Investments OtherInvestments	9854000	USD
CY2018Q4	us-gaap	Other Investments OtherInvestments	8072000	USD
CY2019	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	11909000	USD
CY2018	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	11136000	USD
CY2017	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	10031000	USD
CY2019Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	145000000	shares
CY2019	us-gaap	Revenues Revenues	1415803000	USD
CY2018	us-gaap	Revenues Revenues	1475088000	USD
CY2017	us-gaap	Revenues Revenues	1513779000	USD
CY2019	us-gaap	Revenues Revenues	1415803000	USD
CY2018	us-gaap	Revenues Revenues	1475088000	USD
CY2017	us-gaap	Revenues Revenues	1513779000	USD
CY2019Q4	us-gaap	Unbilled Contracts Receivable UnbilledContractsReceivable	65004000	USD
CY2018Q4	us-gaap	Unbilled Contracts Receivable UnbilledContractsReceivable	63247000	USD
CY2019Q4	mdca	Expenditures Billable Current ExpendituresBillableCurrent	30133000	USD
CY2018Q4	mdca	Expenditures Billable Current ExpendituresBillableCurrent	42369000	USD
CY2019Q4	us-gaap	Customer Advances Current CustomerAdvancesCurrent	171742000	USD
CY2018Q4	us-gaap	Customer Advances Current CustomerAdvancesCurrent	138505000	USD
CY2019	us-gaap	Deferred Revenue Additions DeferredRevenueAdditions	33237000	USD
CY2019	us-gaap	Deferred Revenue Revenue Recognized1 DeferredRevenueRevenueRecognized1	121659000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	-5253000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	-130007000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	241086000	USD
CY2019	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	-17557000	USD
CY2018	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	-138362000	USD
CY2017	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	204832000	USD
CY2019	mdca	Adjustmentto Net Income Allocatedto Convertible Shares AdjustmenttoNetIncomeAllocatedtoConvertibleShares	0	USD
CY2019	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	-0.25
CY2018	mdca	Adjustmentto Net Income Allocatedto Convertible Shares AdjustmenttoNetIncomeAllocatedtoConvertibleShares	0	USD
CY2017	mdca	Adjustmentto Net Income Allocatedto Convertible Shares AdjustmenttoNetIncomeAllocatedtoConvertibleShares	106000	USD
CY2019	mdca	Income Lossfrom Continuing Operations Attributableto Parent Diluted IncomeLossfromContinuingOperationsAttributabletoParentDiluted	-17557000	USD
CY2018	mdca	Income Lossfrom Continuing Operations Attributableto Parent Diluted IncomeLossfromContinuingOperationsAttributabletoParentDiluted	-138362000	USD
CY2017	mdca	Income Lossfrom Continuing Operations Attributableto Parent Diluted IncomeLossfromContinuingOperationsAttributabletoParentDiluted	204938000	USD
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	69132100	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	57218994	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	55255797	shares
CY2019	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	0	shares
CY2018	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	0	shares
CY2017	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	225989	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	69132100	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	57218994	shares
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	55481786	shares
CY2019	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	-0.25
CY2018	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	-2.42
CY2017	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	3.71
CY2018	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	-2.42
CY2017	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	3.70
CY2018	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	1512000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	210633000	USD
CY2019Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	129579000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	81054000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	216735000	USD
CY2018Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	128546000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	88189000	USD
CY2019	us-gaap	Depreciation Depreciation	25133000	USD
CY2018	us-gaap	Depreciation Depreciation	27111000	USD
CY2017	us-gaap	Depreciation Depreciation	23873000	USD
CY2017Q4	us-gaap	Goodwill Goodwill	834879000	USD
CY2018	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	37592000	USD
CY2018	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	81707000	USD
CY2018	us-gaap	Goodwill Transfers GoodwillTransfers	0	USD
CY2018	mdca	Goodwill Transfers Held For Sale GoodwillTransfersHeldForSale	45224000	USD
CY2018	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	-12788000	USD
CY2018Q4	us-gaap	Goodwill Goodwill	732752000	USD
CY2019	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	1025000	USD
CY2019	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	4879000	USD
CY2019	us-gaap	Goodwill Transfers GoodwillTransfers	0	USD
CY2019	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	2793000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	731691000	USD
CY2019	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	4879000	USD
CY2018	us-gaap	Asset Impairment Charges AssetImpairmentCharges	87204000	USD
CY2018	us-gaap	Number Of Reporting Units NumberOfReportingUnits	3	reportable_segment
CY2017	us-gaap	Asset Impairment Charges AssetImpairmentCharges	5471000	USD
CY2017	us-gaap	Number Of Reporting Units NumberOfReportingUnits	2	reportable_segment
CY2019Q4	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	177304000	USD
CY2018Q4	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	173205000	USD
CY2019Q4	us-gaap	Indefinite Lived Trademarks IndefiniteLivedTrademarks	14600000	USD
CY2018Q4	us-gaap	Indefinite Lived Trademarks IndefiniteLivedTrademarks	14600000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	101506000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	122386000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	46613000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	54621000	USD
CY2019Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	54893000	USD
CY2018Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	67765000	USD
CY2019	us-gaap	Acquired Finite Lived Intangible Assets Weighted Average Useful Life AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife	P8Y
CY2018Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Liability Value FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue	82598000	USD
CY2017Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Liability Value FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue	119086000	USD
CY2019	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements	-30719000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	9481000	USD
CY2019	mdca	Amortization Of Intangible Assets Finite Lived AmortizationOfIntangibleAssetsFiniteLived	11828000	USD
CY2018	mdca	Amortization Of Intangible Assets Finite Lived AmortizationOfIntangibleAssetsFiniteLived	17290000	USD
CY2017	mdca	Amortization Of Intangible Assets Finite Lived AmortizationOfIntangibleAssetsFiniteLived	17125000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	8098000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	7547000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	7089000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	8078000	USD
CY2018	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements	-54947000	USD
CY2019	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Gain Loss Included In Earnings FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings	15450000	USD
CY2018	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Gain Loss Included In Earnings FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings	3512000	USD
CY2019	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Purchases FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases	7145000	USD
CY2018	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Purchases FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases	14943000	USD
CY2019	mdca	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Foreign Currency Translation Adjustment FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityForeignCurrencyTranslationAdjustment	197000	USD
CY2018	mdca	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Foreign Currency Translation Adjustment FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityForeignCurrencyTranslationAdjustment	4000	USD
CY2019Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Liability Value FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue	74671000	USD
CY2018Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Liability Value FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue	82598000	USD
CY2019Q4	us-gaap	Business Combination Contingent Consideration Liability BusinessCombinationContingentConsiderationLiability	75220000	USD
CY2018Q4	us-gaap	Business Combination Contingent Consideration Liability BusinessCombinationContingentConsiderationLiability	83695000	USD
CY2019	mdca	Adjustmentstodeferredacquisitionconsiderationincludedinsharebasedcompensation Adjustmentstodeferredacquisitionconsiderationincludedinsharebasedcompensation	10048000	USD
CY2018	mdca	Adjustmentstodeferredacquisitionconsiderationincludedinsharebasedcompensation Adjustmentstodeferredacquisitionconsiderationincludedinsharebasedcompensation	7191000	USD
CY2019	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Gain Loss Included In Earnings FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings	15450000	USD
CY2018	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Gain Loss Included In Earnings FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings	3512000	USD
CY2019Q4	mdca	Lessee Operating Lease Lease Notyet Commenced Liability LesseeOperatingLeaseLeaseNotyetCommencedLiability	13900000	USD
CY2019	us-gaap	Operating Lease Cost OperatingLeaseCost	67044000	USD
CY2019	us-gaap	Variable Lease Cost VariableLeaseCost	18879000	USD
CY2019	us-gaap	Sublease Income SubleaseIncome	8965000	USD
CY2019	us-gaap	Lease Cost LeaseCost	76958000	USD
CY2019	us-gaap	Operating Lease Payments OperatingLeasePayments	69735000	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	269801000	USD
CY2019Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P5Y3M18D
CY2019Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.086
CY2019	mdca	Impairmentof Right Of Use Asset ImpairmentofRightOfUseAsset	3700000	USD
CY2018	us-gaap	Operating Lease Cost OperatingLeaseCost	65093000	USD
CY2017	us-gaap	Operating Lease Cost OperatingLeaseCost	64086000	USD
CY2018	us-gaap	Sublease Income SubleaseIncome	3671000	USD
CY2017	us-gaap	Sublease Income SubleaseIncome	2797000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Remainder Of Fiscal Year LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear	69563000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	59216000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	48593000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	43878000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	37260000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	102552000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	361062000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	93240000	USD
CY2019Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	267822000	USD
CY2019Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	4836000	USD
CY2018Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	4701000	USD
CY2019Q4	us-gaap	Long Term Line Of Credit LongTermLineOfCredit	0	USD
CY2018Q4	us-gaap	Long Term Line Of Credit LongTermLineOfCredit	68143000	USD
CY2019Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	12370000	USD
CY2018Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	14036000	USD
CY2019Q4	us-gaap	Debt Longterm And Shortterm Combined Amount DebtLongtermAndShorttermCombinedAmount	887630000	USD
CY2018Q4	us-gaap	Debt Longterm And Shortterm Combined Amount DebtLongtermAndShorttermCombinedAmount	954107000	USD
CY2019	us-gaap	Interest Expense Debt InterestExpenseDebt	62210000	USD
CY2018	us-gaap	Interest Expense Debt InterestExpenseDebt	64420000	USD
CY2017	us-gaap	Interest Expense Debt InterestExpenseDebt	62001000	USD
CY2019	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	3346000	USD
CY2018	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	3193000	USD
CY2017	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	3022000	USD
CY2019	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	0	USD
CY2018	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	0	USD
CY2017	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	0	USD
CY2019	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	1640000	USD
CY2018	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	1641000	USD
CY2017	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	1725000	USD
CY2019	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	1604000	USD
CY2018	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	1948000	USD
CY2017	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	1830000	USD
CY2019	us-gaap	Defined Benefit Plan Recognized Net Gain Loss Due To Settlements And Curtailments1 DefinedBenefitPlanRecognizedNetGainLossDueToSettlementsAndCurtailments1	-626000	USD
CY2018	us-gaap	Defined Benefit Plan Recognized Net Gain Loss Due To Settlements And Curtailments1 DefinedBenefitPlanRecognizedNetGainLossDueToSettlementsAndCurtailments1	-1039000	USD
CY2017	us-gaap	Defined Benefit Plan Recognized Net Gain Loss Due To Settlements And Curtailments1 DefinedBenefitPlanRecognizedNetGainLossDueToSettlementsAndCurtailments1	0	USD
CY2019	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	-266000	USD
CY2018	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	-258000	USD
CY2017	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	-222000	USD
CY2019	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	928000	USD
CY2018	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	990000	USD
CY2017	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	117000	USD
CY2019	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate	0.0442
CY2018	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate	0.0383
CY2017	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate	0.0432
CY2019	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.0700
CY2018	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.0700
CY2017	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.0740
CY2019	us-gaap	Defined Benefit Plan Amounts Recognized In Other Comprehensive Income Loss Net Gain Loss Before Tax DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax	-2917000	USD
CY2018	us-gaap	Defined Benefit Plan Amounts Recognized In Other Comprehensive Income Loss Net Gain Loss Before Tax DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax	520000	USD
CY2017	us-gaap	Defined Benefit Plan Amounts Recognized In Other Comprehensive Income Loss Net Gain Loss Before Tax DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax	-1558000	USD
CY2019	mdca	Defined Benefit Plan Amounts Recognizedin Other Comprehensive Income Loss Amortizationof Actuarial Gain Loss Before Tax DefinedBenefitPlanAmountsRecognizedinOtherComprehensiveIncomeLossAmortizationofActuarialGainLossBeforeTax	266000	USD
CY2018	mdca	Defined Benefit Plan Amounts Recognizedin Other Comprehensive Income Loss Amortizationof Actuarial Gain Loss Before Tax DefinedBenefitPlanAmountsRecognizedinOtherComprehensiveIncomeLossAmortizationofActuarialGainLossBeforeTax	258000	USD
CY2017	mdca	Defined Benefit Plan Amounts Recognizedin Other Comprehensive Income Loss Amortizationof Actuarial Gain Loss Before Tax DefinedBenefitPlanAmountsRecognizedinOtherComprehensiveIncomeLossAmortizationofActuarialGainLossBeforeTax	222000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	2651000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	-778000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	1336000	USD
CY2019	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent	3579000	USD
CY2018	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent	212000	USD
CY2017	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent	1453000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	37938000	USD
CY2017Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	43750000	USD
CY2016Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	40722000	USD
CY2019	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	1640000	USD
CY2018	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	1641000	USD
CY2017	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	1725000	USD
CY2017	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	-3088000	USD
CY2019	us-gaap	Defined Benefit Plan Benefit Obligation Benefits Paid DefinedBenefitPlanBenefitObligationBenefitsPaid	2693000	USD
CY2019	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	-6127000	USD
CY2018	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	3522000	USD
CY2018	us-gaap	Defined Benefit Plan Benefit Obligation Benefits Paid DefinedBenefitPlanBenefitObligationBenefitsPaid	3931000	USD
CY2017	us-gaap	Defined Benefit Plan Benefit Obligation Benefits Paid DefinedBenefitPlanBenefitObligationBenefitsPaid	1785000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	43012000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	37938000	USD
CY2017Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	43750000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	23181000	USD
CY2017Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	27977000	USD
CY2016Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	24482000	USD
CY2019	us-gaap	Defined Benefit Plan Actual Return On Plan Assets DefinedBenefitPlanActualReturnOnPlanAssets	4188000	USD
CY2018	us-gaap	Defined Benefit Plan Actual Return On Plan Assets DefinedBenefitPlanActualReturnOnPlanAssets	-2093000	USD
CY2017	us-gaap	Defined Benefit Plan Actual Return On Plan Assets DefinedBenefitPlanActualReturnOnPlanAssets	3360000	USD
CY2019	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	2530000	USD
CY2018	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	1228000	USD
CY2017	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	1920000	USD
CY2019	us-gaap	Defined Benefit Plan Plan Assets Benefits Paid DefinedBenefitPlanPlanAssetsBenefitsPaid	2693000	USD
CY2018	us-gaap	Defined Benefit Plan Plan Assets Benefits Paid DefinedBenefitPlanPlanAssetsBenefitsPaid	3931000	USD
CY2017	us-gaap	Defined Benefit Plan Plan Assets Benefits Paid DefinedBenefitPlanPlanAssetsBenefitsPaid	1785000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	27206000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	23181000	USD
CY2017Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	27977000	USD
CY2019Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	15806000	USD
CY2018Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	14757000	USD
CY2017Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	15773000	USD
CY2019Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	15806000	USD
CY2018Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	14757000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Amounts Recognized In Balance Sheet DefinedBenefitPlanAmountsRecognizedInBalanceSheet	15806000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Amounts Recognized In Balance Sheet DefinedBenefitPlanAmountsRecognizedInBalanceSheet	14757000	USD
CY2019Q4	mdca	Defined Benefit Plan Accumulated Other Comprehensive Income Net Settlementand Curtailmentgainlossnetoftax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetSettlementandCurtailmentgainlossnetoftax	-15530000	USD
CY2018Q4	mdca	Defined Benefit Plan Accumulated Other Comprehensive Income Net Settlementand Curtailmentgainlossnetoftax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetSettlementandCurtailmentgainlossnetoftax	-12878000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Net Gains Losses After Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesAfterTax	15530000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Net Gains Losses After Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesAfterTax	12878000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate	0.0339
CY2018Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate	0.0442
CY2019Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	27206000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	23181000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Plan Assets Target Allocation Percentage DefinedBenefitPlanPlanAssetsTargetAllocationPercentage	1.000
CY2019Q4	us-gaap	Defined Benefit Plan Weighted Average Asset Allocations DefinedBenefitPlanWeightedAverageAssetAllocations	1.000
CY2018Q4	us-gaap	Defined Benefit Plan Weighted Average Asset Allocations DefinedBenefitPlanWeightedAverageAssetAllocations	1.000
CY2019	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	2530000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Next Twelve Months DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths	1885000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Two DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo	1885000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Three DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree	1924000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Four DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour	2198000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Five DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive	2323000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Five Fiscal Years Thereafter DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter	11396000	USD
CY2017	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	0	USD
CY2017Q4	mdca	Accrued And Other Liabilities Attributable To Noncontrolling Interest AccruedAndOtherLiabilitiesAttributableToNoncontrollingInterest	11030000	USD
CY2018	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	11785000	USD
CY2018	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	13419000	USD
CY2018	mdca	Adjustments To Noncontrolling Interest AdjustmentsToNoncontrollingInterest	-118000	USD
CY2018Q4	mdca	Accrued And Other Liabilities Attributable To Noncontrolling Interest AccruedAndOtherLiabilitiesAttributableToNoncontrollingInterest	9278000	USD
CY2019	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	16156000	USD
CY2019	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	11392000	USD
CY2019	mdca	Adjustments To Noncontrolling Interest AdjustmentsToNoncontrollingInterest	-14000	USD
CY2019Q4	mdca	Accrued And Other Liabilities Attributable To Noncontrolling Interest AccruedAndOtherLiabilitiesAttributableToNoncontrollingInterest	14028000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	-5253000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	-130007000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	241086000	USD
CY2019	mdca	Net Income Loss Including Transferfrom Non Controlling Interests NetIncomeLossIncludingTransferfromNonControllingInterests	-3342000	USD
CY2018	mdca	Net Income Loss Including Transferfrom Non Controlling Interests NetIncomeLossIncludingTransferfromNonControllingInterests	-119867000	USD
CY2017	mdca	Net Income Loss Including Transferfrom Non Controlling Interests NetIncomeLossIncludingTransferfromNonControllingInterests	243401000	USD
CY2018Q4	us-gaap	Redeemable Noncontrolling Interest Equity Fair Value RedeemableNoncontrollingInterestEquityFairValue	51546000	USD
CY2017Q4	us-gaap	Redeemable Noncontrolling Interest Equity Fair Value RedeemableNoncontrollingInterestEquityFairValue	62886000	USD
CY2019	mdca	Redeemablenoncontrollinginterestredemptionsvalue Redeemablenoncontrollinginterestredemptionsvalue	14530000	USD
CY2018	mdca	Redeemablenoncontrollinginterestredemptionsvalue Redeemablenoncontrollinginterestredemptionsvalue	11943000	USD
CY2019	us-gaap	Noncontrolling Interest Increase From Business Combination NoncontrollingInterestIncreaseFromBusinessCombination	0	USD
CY2018	us-gaap	Noncontrolling Interest Increase From Business Combination NoncontrollingInterestIncreaseFromBusinessCombination	0	USD
CY2019	mdca	Redeemablenoncontrollinginterestchangesinredemptionvalue Redeemablenoncontrollinginterestchangesinredemptionvalue	-3163000	USD
CY2018	mdca	Redeemablenoncontrollinginterestchangesinredemptionvalue Redeemablenoncontrollinginterestchangesinredemptionvalue	1067000	USD
CY2019	mdca	Redeemable Noncontrolling Interest Currency Adjustments RedeemableNoncontrollingInterestCurrencyAdjustments	3000	USD
CY2018	mdca	Redeemable Noncontrolling Interest Currency Adjustments RedeemableNoncontrollingInterestCurrencyAdjustments	-464000	USD
CY2019	mdca	Change In Redeemable Noncontrolling Interest Other ChangeInRedeemableNoncontrollingInterestOther	3117000	USD
CY2018	mdca	Change In Redeemable Noncontrolling Interest Other ChangeInRedeemableNoncontrollingInterestOther	0	USD
CY2019Q4	us-gaap	Redeemable Noncontrolling Interest Equity Fair Value RedeemableNoncontrollingInterestEquityFairValue	36973000	USD
CY2018Q4	us-gaap	Redeemable Noncontrolling Interest Equity Fair Value RedeemableNoncontrollingInterestEquityFairValue	51546000	USD
CY2019Q4	us-gaap	Redeemable Noncontrolling Interest Equity Fair Value RedeemableNoncontrollingInterestEquityFairValue	36973000	USD
CY2019Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	4836000	USD
CY2018Q4	us-gaap	Preferred Stock Value PreferredStockValue	90123000	USD
CY2017Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	11702000	USD
CY2017Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	13656000	USD
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	2460000	USD
CY2018	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	5892000	USD
CY2017	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	5335000	USD
CY2019	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	643000	USD
CY2018	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	472000	USD
CY2017	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	1401000	USD
CY2017Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-1954000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Reclassification Adjustments Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsNetOfTax	0	USD
CY2018	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax	6119000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	6119000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax	-555000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Reclassification Adjustment From Aoci Realized Upon Sale Or Liquidation Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationBeforeTax	0	USD
CY2018	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-555000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-555000	USD
CY2018	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	6119000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	6674000	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	13101000	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	17821000	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	4720000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Reclassification Adjustments Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsNetOfTax	0	USD
CY2019	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax	-7078000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-7078000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax	1911000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Reclassification Adjustment From Aoci Realized Upon Sale Or Liquidation Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationBeforeTax	0	USD
CY2019	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	1911000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	1911000	USD
CY2019	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-7078000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-8989000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	15012000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	10743000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-4269000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	20867000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-88669000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	86022000	USD
CY2019	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	5525000	USD
CY2018	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	8030000	USD
CY2017	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	4955000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	4791000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	21585000	USD
CY2017	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-173313000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	10316000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	29615000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-168358000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	20867000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-88669000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	86022000	USD
CY2019	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	4382000	USD
CY2018	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	-18621000	USD
CY2017	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	30108000	USD
CY2019	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	1141000	USD
CY2018	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	-3475000	USD
CY2017	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	8791000	USD
CY2019	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	3823000	USD
CY2019	us-gaap	Deferred Other Tax Expense Benefit DeferredOtherTaxExpenseBenefit	0	USD
CY2017	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	1441000	USD
CY2019	us-gaap	Income Tax Reconciliation Nondeductible Expense Other IncomeTaxReconciliationNondeductibleExpenseOther	709000	USD
CY2018	us-gaap	Income Tax Reconciliation Nondeductible Expense Other IncomeTaxReconciliationNondeductibleExpenseOther	10091000	USD
CY2017	us-gaap	Income Tax Reconciliation Nondeductible Expense Other IncomeTaxReconciliationNondeductibleExpenseOther	-220000	USD
CY2019	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-2830000	USD
CY2018	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	49482000	USD
CY2017	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-103212000	USD
CY2019	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	1422000	USD
CY2018	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	-152000	USD
CY2017	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	-2939000	USD
CY2019	us-gaap	Tax Cuts And Jobs Act Of2017 Income Tax Expense Benefit TaxCutsAndJobsActOf2017IncomeTaxExpenseBenefit	0	USD
CY2018	us-gaap	Tax Cuts And Jobs Act Of2017 Income Tax Expense Benefit TaxCutsAndJobsActOf2017IncomeTaxExpenseBenefit	0	USD
CY2017	us-gaap	Tax Cuts And Jobs Act Of2017 Income Tax Expense Benefit TaxCutsAndJobsActOf2017IncomeTaxExpenseBenefit	-100472000	USD
CY2019	us-gaap	Income Tax Reconciliation Minority Interest Income Expense IncomeTaxReconciliationMinorityInterestIncomeExpense	3566000	USD
CY2018	us-gaap	Income Tax Reconciliation Minority Interest Income Expense IncomeTaxReconciliationMinorityInterestIncomeExpense	2674000	USD
CY2017	us-gaap	Income Tax Reconciliation Minority Interest Income Expense IncomeTaxReconciliationMinorityInterestIncomeExpense	4413000	USD
CY2019	mdca	Effective Income Tax Rate Reconciliation Increase Decrease Foreign Tax Credits Amount EffectiveIncomeTaxRateReconciliationIncreaseDecreaseForeignTaxCreditsAmount	3646000	USD
CY2018	mdca	Effective Income Tax Rate Reconciliation Increase Decrease Foreign Tax Credits Amount EffectiveIncomeTaxRateReconciliationIncreaseDecreaseForeignTaxCreditsAmount	1711000	USD
CY2017	mdca	Effective Income Tax Rate Reconciliation Increase Decrease Foreign Tax Credits Amount EffectiveIncomeTaxRateReconciliationIncreaseDecreaseForeignTaxCreditsAmount	-2453000	USD
CY2018	us-gaap	Deferred Other Tax Expense Benefit DeferredOtherTaxExpenseBenefit	-8865000	USD
CY2017	us-gaap	Deferred Other Tax Expense Benefit DeferredOtherTaxExpenseBenefit	0	USD
CY2019	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	1589000	USD
CY2018	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	606000	USD
CY2017	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	5011000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	10316000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	29615000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-168358000	USD
CY2019	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.494
CY2018	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	-0.334
CY2017	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	-1.957
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	10316000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	20867000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	29615000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-88669000	USD
CY2018Q4	us-gaap	Income Tax Receivable IncomeTaxReceivable	5025000	USD
CY2017Q4	us-gaap	Income Tax Receivable IncomeTaxReceivable	4388000	USD
CY2018Q4	us-gaap	Taxes Payable Current And Noncurrent TaxesPayableCurrentAndNoncurrent	11722000	USD
CY2017Q4	us-gaap	Taxes Payable Current And Noncurrent TaxesPayableCurrentAndNoncurrent	10045000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Property Plant And Equipment DeferredTaxAssetsPropertyPlantAndEquipment	0	USD
CY2018Q4	us-gaap	Deferred Tax Assets Property Plant And Equipment DeferredTaxAssetsPropertyPlantAndEquipment	905000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	70265000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	67059000	USD
CY2019Q4	mdca	Deferred Tax Assets Interest Deductions DeferredTaxAssetsInterestDeductions	16797000	USD
CY2018Q4	mdca	Deferred Tax Assets Interest Deductions DeferredTaxAssetsInterestDeductions	8911000	USD
CY2019Q4	mdca	Deferred Tax Assets Refinancing Charge DeferredTaxAssetsRefinancingCharge	669000	USD
CY2018Q4	mdca	Deferred Tax Assets Refinancing Charge DeferredTaxAssetsRefinancingCharge	2926000	USD
CY2019Q4	mdca	Deferred Tax Assets Deferred Acquisition Consideration DeferredTaxAssetsDeferredAcquisitionConsideration	117421000	USD
CY2018Q4	mdca	Deferred Tax Assets Deferred Acquisition Consideration DeferredTaxAssetsDeferredAcquisitionConsideration	125786000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	1736000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	2101000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Pensions DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions	4414000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Pensions DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions	3872000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Unrealized Currency Losses DeferredTaxAssetsUnrealizedCurrencyLosses	11373000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Unrealized Currency Losses DeferredTaxAssetsUnrealizedCurrencyLosses	14645000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Capital Loss Carryforwards DeferredTaxAssetsCapitalLossCarryforwards	13081000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Capital Loss Carryforwards DeferredTaxAssetsCapitalLossCarryforwards	11827000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Reserves DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves	77824000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Reserves DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves	8280000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	313580000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	246312000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	65649000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	68479000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	247931000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	177833000	USD
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CY2019Q4	us-gaap	Deferred Tax Liabilities Deferred Expense DeferredTaxLiabilitiesDeferredExpense	546000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Deferred Expense DeferredTaxLiabilitiesDeferredExpense	0	USD
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CY2018Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	0	USD
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CY2018Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssets	91726000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	167218000	USD
CY2018Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	91726000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	80713000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	86107000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Net Noncurrent DeferredTaxAssetsNetNoncurrent	84900000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Net Noncurrent DeferredTaxAssetsNetNoncurrent	91436000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	4187000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	5329000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	80713000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	86107000	USD
CY2018Q4	mdca	Indefinite Loss Carry Forwards IndefiniteLossCarryForwards	205050000	USD
CY2019Q4	mdca	Undistributed Earningsof Foreign Subsidiaries Amount No Longer Subjectto Permanent Reinvestment Assertion UndistributedEarningsofForeignSubsidiariesAmountNoLongerSubjecttoPermanentReinvestmentAssertion	5462000	USD
CY2019	mdca	Current Year Positions Changesin Reserve CurrentYearPositionsChangesinReserve	275000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	68479000	USD
CY2019Q4	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	-2830000	USD
CY2019	mdca	Foreign Subsidiaries Amount No Longer Subjectto Permanent Reinvestment Assertion Tax Expense ForeignSubsidiariesAmountNoLongerSubjecttoPermanentReinvestmentAssertionTaxExpense	546000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1107000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	973000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	111000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	87000	USD
CY2018Q4	mdca	Income Tax Reserve IncomeTaxReserve	887000	USD
CY2017Q4	mdca	Income Tax Reserve IncomeTaxReserve	1433000	USD
CY2016Q4	mdca	Income Tax Reserve IncomeTaxReserve	1465000	USD
CY2018	mdca	Current Year Positions Changesin Reserve CurrentYearPositionsChangesinReserve	0	USD
CY2017	mdca	Current Year Positions Changesin Reserve CurrentYearPositionsChangesinReserve	489000	USD
CY2019	mdca	Prior Period Positions Changesin Reserve PriorPeriodPositionsChangesinReserve	0	USD
CY2018	mdca	Prior Period Positions Changesin Reserve PriorPeriodPositionsChangesinReserve	7000	USD
CY2017	mdca	Prior Period Positions Changesin Reserve PriorPeriodPositionsChangesinReserve	-436000	USD
CY2019	mdca	Settlement Of Uncertainty SettlementOfUncertainty	0	USD
CY2018	mdca	Settlement Of Uncertainty SettlementOfUncertainty	314000	USD
CY2017	mdca	Settlement Of Uncertainty SettlementOfUncertainty	0	USD
CY2019	mdca	Lapseofstatuteoflimitations Lapseofstatuteoflimitations	166000	USD
CY2018	mdca	Lapseofstatuteoflimitations Lapseofstatuteoflimitations	239000	USD
CY2017	mdca	Lapseofstatuteoflimitations Lapseofstatuteoflimitations	85000	USD
CY2019Q4	mdca	Income Tax Reserve IncomeTaxReserve	996000	USD
CY2018Q4	mdca	Income Tax Reserve IncomeTaxReserve	887000	USD
CY2017Q4	mdca	Income Tax Reserve IncomeTaxReserve	1433000	USD
CY2019	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	4900000	USD
CY2018	us-gaap	Asset Impairment Charges AssetImpairmentCharges	87200000	USD
CY2019	mdca	Impairmentof Right Of Use Asset ImpairmentofRightOfUseAsset	3700000	USD
CY2019	us-gaap	Revenues Revenues	1415803000	USD
CY2018	us-gaap	Revenues Revenues	1475088000	USD
CY2017	us-gaap	Revenues Revenues	1513779000	USD
CY2019	mdca	Adjusted Ebitda AdjustedEBITDA	174153000	USD
CY2018	mdca	Adjusted Ebitda AdjustedEBITDA	161451000	USD
CY2017	mdca	Adjusted Ebitda AdjustedEBITDA	203492000	USD
CY2019	us-gaap	Depreciation And Amortization DepreciationAndAmortization	38329000	USD
CY2018	us-gaap	Depreciation And Amortization DepreciationAndAmortization	46196000	USD
CY2017	us-gaap	Depreciation And Amortization DepreciationAndAmortization	43474000	USD
CY2019	us-gaap	Asset Impairment Charges AssetImpairmentCharges	8599000	USD
CY2018	us-gaap	Asset Impairment Charges AssetImpairmentCharges	87204000	USD
CY2017	us-gaap	Asset Impairment Charges AssetImpairmentCharges	5471000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	31040000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	18416000	USD
CY2017	us-gaap	Share Based Compensation ShareBasedCompensation	24350000	USD
CY2019	mdca	Deferred Acquisition Consideration Expense Income DeferredAcquisitionConsiderationExpenseIncome	-5403000	USD
CY2018	mdca	Deferred Acquisition Consideration Expense Income DeferredAcquisitionConsiderationExpenseIncome	457000	USD
CY2017	mdca	Deferred Acquisition Consideration Expense Income DeferredAcquisitionConsiderationExpenseIncome	4898000	USD
CY2019	us-gaap	Gain Loss On Investments GainLossOnInvestments	-2048000	USD
CY2018	us-gaap	Gain Loss On Investments GainLossOnInvestments	-779000	USD
CY2017	us-gaap	Gain Loss On Investments GainLossOnInvestments	-3939000	USD
CY2019	us-gaap	Other Nonrecurring Income Expense OtherNonrecurringIncomeExpense	-9274000	USD
CY2018	us-gaap	Other Nonrecurring Income Expense OtherNonrecurringIncomeExpense	-7879000	USD
CY2017	us-gaap	Other Nonrecurring Income Expense OtherNonrecurringIncomeExpense	-253000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	79460000	USD
CY2019	us-gaap	Interest And Debt Expense InterestAndDebtExpense	64942000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-168358000	USD
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	1434000	USD
CY2017	us-gaap	Operating Income Loss OperatingIncomeLoss	130903000	USD
CY2018	us-gaap	Interest And Debt Expense InterestAndDebtExpense	67075000	USD
CY2017	us-gaap	Interest Expense Other InterestExpenseOther	64364000	USD
CY2019	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	8750000	USD
CY2018	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-23258000	USD
CY2017	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	18137000	USD
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-2401000	USD
CY2018	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	230000	USD
CY2017	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	1346000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	20867000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-88669000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	86022000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	10316000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	29615000	USD
CY2019	mdca	Income Loss From Continuing Operations Before Equity In Earnings Of Nonconsolidated Affiliates IncomeLossFromContinuingOperationsBeforeEquityInEarningsOfNonconsolidatedAffiliates	10551000	USD
CY2018	mdca	Income Loss From Continuing Operations Before Equity In Earnings Of Nonconsolidated Affiliates IncomeLossFromContinuingOperationsBeforeEquityInEarningsOfNonconsolidatedAffiliates	-118284000	USD
CY2017	mdca	Income Loss From Continuing Operations Before Equity In Earnings Of Nonconsolidated Affiliates IncomeLossFromContinuingOperationsBeforeEquityInEarningsOfNonconsolidatedAffiliates	254380000	USD
CY2019	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	352000	USD
CY2018	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	62000	USD
CY2017	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	2081000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	10903000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	-118222000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	256461000	USD
CY2019	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	16156000	USD
CY2018	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	11785000	USD
CY2017	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	15375000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	-5253000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	-130007000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	241086000	USD
CY2019	us-gaap	Depreciation And Amortization DepreciationAndAmortization	38329000	USD
CY2018	us-gaap	Depreciation And Amortization DepreciationAndAmortization	46196000	USD
CY2017	us-gaap	Depreciation And Amortization DepreciationAndAmortization	43474000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	31040000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	18416000	USD
CY2017	us-gaap	Share Based Compensation ShareBasedCompensation	24350000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	18596000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	20264000	USD
CY2017	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	32958000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	81054000	USD
CY2018Q4	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	800517000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	88189000	USD
CY2019Q4	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	786584000	USD
CY2019	us-gaap	Revenues Revenues	1415803000	USD
CY2018	us-gaap	Revenues Revenues	1475088000	USD
CY2019Q1	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	237153000	USD
CY2019Q2	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	240749000	USD
CY2019Q3	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	222448000	USD
CY2019Q4	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	260726000	USD
CY2017	us-gaap	Revenues Revenues	1513779000	USD
CY2019Q1	us-gaap	Revenues Revenues	328791000	USD
CY2019Q2	us-gaap	Revenues Revenues	362130000	USD
CY2019Q3	us-gaap	Revenues Revenues	342907000	USD
CY2019Q4	us-gaap	Revenues Revenues	381975000	USD
CY2018Q1	us-gaap	Revenues Revenues	326968000	USD
CY2018Q2	us-gaap	Revenues Revenues	379743000	USD
CY2018Q3	us-gaap	Revenues Revenues	375830000	USD
CY2018Q4	us-gaap	Revenues Revenues	392547000	USD
CY2018Q1	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	243030000	USD
CY2018Q2	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	253390000	USD
CY2018Q3	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	238690000	USD
CY2018Q4	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	256088000	USD
CY2019Q1	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	316000	USD
CY2019Q2	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	7333000	USD
CY2019Q3	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	5513000	USD
CY2019Q4	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	-2259000	USD
CY2018Q1	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	-28519000	USD
CY2018Q2	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	5951000	USD
CY2018Q3	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	-13667000	USD
CY2018Q4	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	-81987000	USD
CY2019Q1	us-gaap	Net Income Loss NetIncomeLoss	-113000	USD
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	4290000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	-1752000	USD
CY2019Q4	us-gaap	Net Income Loss NetIncomeLoss	-7678000	USD
CY2018Q1	us-gaap	Net Income Loss NetIncomeLoss	-29416000	USD
CY2018Q2	us-gaap	Net Income Loss NetIncomeLoss	3406000	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	-16125000	USD
CY2018Q4	us-gaap	Net Income Loss NetIncomeLoss	-87872000	USD
CY2019Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.04
CY2019Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.01
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.07
CY2018Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.56
CY2019Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.14
CY2019Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	981000	USD
CY2020Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	13500000	USD
CY2019Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	748000	USD
CY2018Q4	us-gaap	Asset Impairment Charges AssetImpairmentCharges	63879000	USD
CY2019Q4	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	-2830000	USD
CY2018Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.02
CY2018Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.32
CY2018Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-1.57
CY2019Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.04
CY2019Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.01
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.07
CY2019Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.14
CY2018Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.56
CY2018Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.02
CY2018Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.32
CY2018Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-1.57
CY2019Q4	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	4348000	USD
CY2018Q4	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-13323000	USD
CY2019Q4	us-gaap	Share Based Compensation ShareBasedCompensation	18408000	USD
CY2018Q4	us-gaap	Share Based Compensation ShareBasedCompensation	1533000	USD
CY2019Q4	us-gaap	Asset Impairment Charges AssetImpairmentCharges	6655000	USD
CY2018Q4	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	49447000	USD
CY2020Q1	us-gaap	Revenues Revenues	327742000	USD
CY2019Q1	us-gaap	Revenues Revenues	328791000	USD
CY2020Q1	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	222693000	USD
CY2019Q1	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	237153000	USD
CY2020Q1	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	66353000	USD
CY2019Q1	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	67118000	USD
CY2020Q1	us-gaap	Depreciation And Amortization DepreciationAndAmortization	9206000	USD
CY2019Q1	us-gaap	Depreciation And Amortization DepreciationAndAmortization	8838000	USD
CY2020Q1	us-gaap	Asset Impairment Charges AssetImpairmentCharges	161000	USD
CY2019Q1	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0	USD
CY2020Q1	us-gaap	Costs And Expenses CostsAndExpenses	298413000	USD
CY2019Q1	us-gaap	Costs And Expenses CostsAndExpenses	313109000	USD
CY2020Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	29329000	USD
CY2019Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	15682000	USD
CY2020Q1	us-gaap	Interest And Debt Expense InterestAndDebtExpense	15612000	USD
CY2019Q1	us-gaap	Interest And Debt Expense InterestAndDebtExpense	16760000	USD
CY2020Q1	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-14757000	USD
CY2019Q1	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	5442000	USD
CY2020Q1	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	16334000	USD
CY2019Q1	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-3383000	USD
CY2020Q1	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-14035000	USD
CY2019Q1	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-14701000	USD
CY2020Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	15294000	USD
CY2020Q1	mdca	Income Loss From Continuing Operations Before Equity In Earnings Of Nonconsolidated Affiliates IncomeLossFromContinuingOperationsBeforeEquityInEarningsOfNonconsolidatedAffiliates	1794000	USD
CY2019Q1	mdca	Income Loss From Continuing Operations Before Equity In Earnings Of Nonconsolidated Affiliates IncomeLossFromContinuingOperationsBeforeEquityInEarningsOfNonconsolidatedAffiliates	233000	USD
CY2020Q1	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	0	USD
CY2020Q1	us-gaap	Profit Loss ProfitLoss	1794000	USD
CY2019Q1	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	83000	USD
CY2019Q1	us-gaap	Profit Loss ProfitLoss	316000	USD
CY2020Q1	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	791000	USD
CY2019Q1	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	429000	USD
CY2020Q1	us-gaap	Accounts Payable Current AccountsPayableCurrent	153490000	USD
CY2019Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	200148000	USD
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	1003000	USD
CY2019Q1	us-gaap	Net Income Loss NetIncomeLoss	-113000	USD
CY2020Q1	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	-2437000	USD
CY2019Q1	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	-2496000	USD
CY2020Q1	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	-0.03
CY2019Q1	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	-0.04
CY2020Q1	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	-0.03
CY2019Q1	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	-0.04
CY2020Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	72397661	shares
CY2019Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	60258102	shares
CY2020Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	72397661	shares
CY2019Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	60258102	shares
CY2020Q1	us-gaap	Profit Loss ProfitLoss	1794000	USD
CY2019Q1	us-gaap	Profit Loss ProfitLoss	316000	USD
CY2020Q1	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	7429000	USD
CY2019Q1	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-4659000	USD
CY2020Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	7429000	USD
CY2019Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-4659000	USD
CY2020Q1	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	9223000	USD
CY2019Q1	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	-4343000	USD
CY2020Q1	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	282000	USD
CY2019Q1	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	780000	USD
CY2020Q1	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	8941000	USD
CY2019Q1	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-5123000	USD
CY2020Q1	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	221102000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	106933000	USD
CY2020Q1	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	406196000	USD
CY2019Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	449288000	USD
CY2020Q1	mdca	Expenditures Billable Current ExpendituresBillableCurrent	22763000	USD
CY2019Q4	mdca	Expenditures Billable Current ExpendituresBillableCurrent	30133000	USD
CY2020Q1	us-gaap	Other Assets Current OtherAssetsCurrent	44689000	USD
CY2019Q4	us-gaap	Other Assets Current OtherAssetsCurrent	35613000	USD
CY2020Q1	us-gaap	Assets Current AssetsCurrent	694750000	USD
CY2019Q4	us-gaap	Assets Current AssetsCurrent	621967000	USD
CY2020Q1	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	75767000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	81054000	USD
CY2020Q1	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	216194000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	223622000	USD
CY2020Q1	us-gaap	Goodwill Goodwill	716407000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	731691000	USD
CY2020Q1	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	50640000	USD
CY2019Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	54893000	USD
CY2020Q1	us-gaap	Assets Assets	1859669000	USD
CY2019Q4	us-gaap	Assets Assets	1828306000	USD
CY2020Q1	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	76289000	USD
CY2019Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	84900000	USD
CY2020Q1	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	29622000	USD
CY2019Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	30179000	USD
CY2020Q1	mdca	Accrued Expenses And Other Current Liabilities AccruedExpensesAndOtherCurrentLiabilities	325826000	USD
CY2019Q4	mdca	Accrued Expenses And Other Current Liabilities AccruedExpensesAndOtherCurrentLiabilities	353575000	USD
CY2020Q1	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	211254000	USD
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	219163000	USD
CY2020Q1	mdca	Other Liabilities Including Deferred Tax Liabilities OtherLiabilitiesIncludingDeferredTaxLiabilities	35523000	USD
CY2020Q1	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	146803000	USD
CY2019Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	171742000	USD
CY2020Q1	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	48022000	USD
CY2019Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	48659000	USD
CY2020Q1	us-gaap	Business Combination Contingent Consideration Liability Current BusinessCombinationContingentConsiderationLiabilityCurrent	46337000	USD
CY2019Q4	us-gaap	Business Combination Contingent Consideration Liability Current BusinessCombinationContingentConsiderationLiabilityCurrent	45521000	USD
CY2020Q1	us-gaap	Liabilities Current LiabilitiesCurrent	720478000	USD
CY2019Q4	us-gaap	Liabilities Current LiabilitiesCurrent	819645000	USD
CY2020Q1	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	1014260000	USD
CY2019Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	887630000	USD
CY2020Q1	us-gaap	Business Combination Contingent Consideration Liability Noncurrent BusinessCombinationContingentConsiderationLiabilityNoncurrent	26399000	USD
CY2019Q4	us-gaap	Business Combination Contingent Consideration Liability Noncurrent BusinessCombinationContingentConsiderationLiabilityNoncurrent	29699000	USD
CY2019Q4	mdca	Other Liabilities Including Deferred Tax Liabilities OtherLiabilitiesIncludingDeferredTaxLiabilities	25771000	USD
CY2020Q1	us-gaap	Liabilities Liabilities	2007914000	USD
CY2019Q4	us-gaap	Liabilities Liabilities	1981908000	USD
CY2020Q1	us-gaap	Redeemable Noncontrolling Interest Equity Fair Value RedeemableNoncontrollingInterestEquityFairValue	35698000	USD
CY2019Q4	us-gaap	Redeemable Noncontrolling Interest Equity Fair Value RedeemableNoncontrollingInterestEquityFairValue	36973000	USD
CY2020Q1	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2019Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2020Q1	us-gaap	Preferred Stock Value PreferredStockValue	152746000	USD
CY2019Q4	us-gaap	Preferred Stock Value PreferredStockValue	152746000	USD
CY2020Q1	us-gaap	Common Stock Value CommonStockValue	99587000	USD
CY2019Q4	us-gaap	Common Stock Value CommonStockValue	101469000	USD
CY2020Q1	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-479694000	USD
CY2019Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-480779000	USD
CY2020Q1	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	3669000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-4269000	USD
CY2020Q1	us-gaap	Stockholders Equity StockholdersEquity	-223692000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	-230833000	USD
CY2020Q1	us-gaap	Minority Interest MinorityInterest	39749000	USD
CY2019Q4	us-gaap	Minority Interest MinorityInterest	40258000	USD
CY2020Q1	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	-183943000	USD
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	-190575000	USD
CY2020Q1	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1859669000	USD
CY2019Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1828306000	USD
CY2019Q1	us-gaap	Profit Loss ProfitLoss	316000	USD
CY2020Q1	us-gaap	Share Based Compensation ShareBasedCompensation	3070000	USD
CY2019Q1	us-gaap	Share Based Compensation ShareBasedCompensation	2972000	USD
CY2020Q1	us-gaap	Profit Loss ProfitLoss	1794000	USD
CY2020Q1	us-gaap	Interest Paid InterestPaid	145000	USD
CY2019Q1	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	3373000	USD
CY2020Q1	us-gaap	Depreciation Depreciation	9206000	USD
CY2019Q1	us-gaap	Depreciation Depreciation	8838000	USD
CY2020Q1	mdca	Increase Decrease In Accounts Payable Accrued Expenses And Other Liabilities IncreaseDecreaseInAccountsPayableAccruedExpensesAndOtherLiabilities	-62120000	USD
CY2019Q1	mdca	Increase Decrease In Accounts Payable Accrued Expenses And Other Liabilities IncreaseDecreaseInAccountsPayableAccruedExpensesAndOtherLiabilities	-75105000	USD
CY2020Q1	us-gaap	Payment For Contingent Consideration Liability Operating Activities PaymentForContingentConsiderationLiabilityOperatingActivities	782000	USD
CY2019Q1	us-gaap	Payment For Contingent Consideration Liability Operating Activities PaymentForContingentConsiderationLiabilityOperatingActivities	3657000	USD
CY2019Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-2922000	USD
CY2020Q1	mdca	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents From Trusts Increase Decrease From Cash Classified As Assets Held For Sale CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsFromTrustsIncreaseDecreaseFromCashClassifiedAsAssetsHeldForSale	0	USD
CY2020Q1	us-gaap	Asset Impairment Charges AssetImpairmentCharges	161000	USD
CY2019Q1	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0	USD
CY2020Q1	mdca	Adjustment To Deferred Acquisition Consideration AdjustmentToDeferredAcquisitionConsideration	-4600000	USD
CY2019Q1	mdca	Adjustment To Deferred Acquisition Consideration AdjustmentToDeferredAcquisitionConsideration	-7643000	USD
CY2020Q1	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	8511000	USD
CY2019Q1	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	748000	USD
CY2020Q1	us-gaap	Increase Decrease In Other Noncurrent Assets And Liabilities Net IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNet	-4489000	USD
CY2019Q1	us-gaap	Increase Decrease In Other Noncurrent Assets And Liabilities Net IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNet	2608000	USD
CY2020Q1	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-41148000	USD
CY2019Q1	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	29957000	USD
CY2020Q1	mdca	Increase Decrease In Expenditures Billable To Clients IncreaseDecreaseInExpendituresBillableToClients	-7370000	USD
CY2019Q1	mdca	Increase Decrease In Expenditures Billable To Clients IncreaseDecreaseInExpendituresBillableToClients	4294000	USD
CY2020Q1	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	3385000	USD
CY2020Q1	us-gaap	Increase Decrease In Deferred Revenue IncreaseDecreaseInDeferredRevenue	-24816000	USD
CY2019Q1	us-gaap	Increase Decrease In Deferred Revenue IncreaseDecreaseInDeferredRevenue	32563000	USD
CY2020Q1	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-19954000	USD
CY2019Q1	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-81200000	USD
CY2020Q1	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	1546000	USD
CY2019Q1	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	3606000	USD
CY2020Q1	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	18920000	USD
CY2019Q1	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	23050000	USD
CY2020Q1	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	729000	USD
CY2019Q1	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	1050000	USD
CY2020Q1	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	0	USD
CY2019Q1	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	293000	USD
CY2020Q1	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	16645000	USD
CY2019Q1	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	18101000	USD
CY2020Q1	us-gaap	Payment For Contingent Consideration Liability Financing Activities PaymentForContingentConsiderationLiabilityFinancingActivities	750000	USD
CY2019Q1	us-gaap	Payment For Contingent Consideration Liability Financing Activities PaymentForContingentConsiderationLiabilityFinancingActivities	0	USD
CY2020Q1	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	4608000	USD
CY2019Q1	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	1536000	USD
CY2020Q1	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	119642000	USD
CY2019Q1	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	60753000	USD
CY2020Q1	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	-2164000	USD
CY2019Q1	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	-576000	USD
CY2020Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	114169000	USD
CY2019Q1	us-gaap	Interest Paid InterestPaid	1629000	USD
CY2019Q1	mdca	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents From Trusts Increase Decrease From Cash Classified As Assets Held For Sale CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsFromTrustsIncreaseDecreaseFromCashClassifiedAsAssetsHeldForSale	-3307000	USD
CY2020Q1	mdca	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Decrease From Cash Classified As Assets Held For Sale CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsDecreaseFromCashClassifiedAsAssetsHeldForSale	0	USD
CY2019Q1	mdca	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Decrease From Cash Classified As Assets Held For Sale CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsDecreaseFromCashClassifiedAsAssetsHeldForSale	1728000	USD
CY2020Q1	mdca	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rage Effect Net Of Cash Classified Within Assets Held For Sale CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRageEffectNetOfCashClassifiedWithinAssetsHeldForSale	114169000	USD
CY2020Q1	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	0	USD
CY2019Q1	mdca	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rage Effect Net Of Cash Classified Within Assets Held For Sale CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRageEffectNetOfCashClassifiedWithinAssetsHeldForSale	-4501000	USD
CY2020Q1	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	0	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	106933000	USD
CY2020Q1	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	637000	USD
CY2020Q1	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	476000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	30873000	USD
CY2020Q1	mdca	Increase Decreasein Redemption Valueof Redeemable Noncontrolling Interests IncreaseDecreaseinRedemptionValueofRedeemableNoncontrollingInterests	-1218000	USD
CY2020Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	221102000	USD
CY2019Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	26372000	USD
CY2020Q1	mdca	Adjustmentsto Additional Paidin Capital Changesdueto Business Combinations AdjustmentstoAdditionalPaidinCapitalChangesduetoBusinessCombinations	-503000	USD
CY2020Q1	us-gaap	Stockholders Equity Other StockholdersEquityOther	-82000	USD
CY2020Q1	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	-183943000	USD
CY2020Q1	us-gaap	Income Taxes Paid IncomeTaxesPaid	849000	USD
CY2019Q1	us-gaap	Income Taxes Paid IncomeTaxesPaid	1677000	USD
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	-190575000	USD
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	1003000	USD
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	1003000	USD
CY2020Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	7429000	USD
CY2020Q1	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	0	USD
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	-257590000	USD
CY2019Q1	us-gaap	Net Income Loss NetIncomeLoss	-113000	USD
CY2019Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-4659000	USD
CY2019Q1	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	97629000	USD
CY2019Q1	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	56000	USD
CY2019Q1	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	-1291000	USD
CY2019Q1	mdca	Increase Decreasein Redemption Valueof Redeemable Noncontrolling Interests IncreaseDecreaseinRedemptionValueofRedeemableNoncontrollingInterests	5919000	USD
CY2019Q1	us-gaap	Minority Interest Change In Redemption Value MinorityInterestChangeInRedemptionValue	-24735000	USD
CY2019Q1	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	-184896000	USD
CY2020Q1	us-gaap	Revenues Revenues	327742000	USD
CY2019Q1	us-gaap	Revenues Revenues	328791000	USD
CY2020Q1	us-gaap	Revenues Revenues	327742000	USD
CY2019Q1	us-gaap	Revenues Revenues	328791000	USD
CY2020Q1	us-gaap	Unbilled Contracts Receivable UnbilledContractsReceivable	75638000	USD
CY2019Q4	us-gaap	Unbilled Contracts Receivable UnbilledContractsReceivable	65004000	USD
CY2020Q1	mdca	Expenditures Billable Current ExpendituresBillableCurrent	22763000	USD
CY2019Q4	mdca	Expenditures Billable Current ExpendituresBillableCurrent	30133000	USD
CY2020Q1	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	146803000	USD
CY2019Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	171742000	USD
CY2020Q1	us-gaap	Deferred Revenue Additions DeferredRevenueAdditions	24939000	USD
	us-gaap	Deferred Revenue Revenue Recognized1 DeferredRevenueRevenueRecognized1	104937000	USD
CY2020Q1	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	35771000	USD
CY2020Q1	mdca	Revenue Remaining Performance Obligation Current Year Percentage RevenueRemainingPerformanceObligationCurrentYearPercentage	0.87
CY2020Q1	mdca	Lease Payments LeasePayments	112000000000	USD
CY2020Q1	mdca	Revenue Remaining Performance Obligation Year Two Percentage RevenueRemainingPerformanceObligationYearTwoPercentage	0.11
CY2020Q1	mdca	Revenue Remaining Performance Obligation Year Three Percentage RevenueRemainingPerformanceObligationYearThreePercentage	0.02
CY2019Q2	mdca	Lessee Operating Lease Lease Notyet Commenced Liability LesseeOperatingLeaseLeaseNotyetCommencedLiability	124233000000	USD
CY2020Q1	us-gaap	Operating Lease Liability OperatingLeaseLiability	259276000	USD
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	1003000	USD
CY2019Q1	us-gaap	Net Income Loss NetIncomeLoss	-113000	USD
CY2020Q1	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	-2437000	USD
CY2019Q1	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	-2496000	USD
CY2020Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	72397661	shares
CY2019Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	60258102	shares
CY2020Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	72397661	shares
CY2019Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	60258102	shares
CY2020Q1	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	-0.03
CY2019Q1	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	-0.04
CY2020Q1	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	-0.03
CY2019Q1	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	-0.04
CY2020Q1	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	2835770000	shares
CY2019Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Liability Value FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue	74671000	USD
CY2018Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Liability Value FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue	82598000	USD
CY2020Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements	-1125000	USD
CY2019	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements	-30719000	USD
CY2020Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Gain Loss Included In Earnings FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings	-2575000	USD
CY2019	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Gain Loss Included In Earnings FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings	15450000	USD
CY2020Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Purchases FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases	1389000	USD
CY2019	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Purchases FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases	7145000	USD
CY2020Q1	mdca	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Foreign Currency Translation Adjustment FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityForeignCurrencyTranslationAdjustment	-185000	USD
CY2019	mdca	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Foreign Currency Translation Adjustment FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityForeignCurrencyTranslationAdjustment	197000	USD
CY2020Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Liability Value FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue	72175000	USD
CY2019Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Liability Value FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue	74671000	USD
CY2020Q1	us-gaap	Business Combination Contingent Consideration Liability BusinessCombinationContingentConsiderationLiability	72736000	USD
CY2019Q4	us-gaap	Business Combination Contingent Consideration Liability BusinessCombinationContingentConsiderationLiability	75220000	USD
CY2020Q1	mdca	Adjustmentstodeferredacquisitionconsiderationincludedinsharebasedcompensation Adjustmentstodeferredacquisitionconsiderationincludedinsharebasedcompensation	2025000	USD
CY2019Q1	mdca	Adjustmentstodeferredacquisitionconsiderationincludedinsharebasedcompensation Adjustmentstodeferredacquisitionconsiderationincludedinsharebasedcompensation	809000	USD
CY2020Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Gain Loss Included In Earnings FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings	-2575000	USD
CY2019Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Gain Loss Included In Earnings FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings	-6834000	USD
CY2019Q1	mdca	Adjustmentsto Additional Paidin Capital Changesdueto Business Combinations AdjustmentstoAdditionalPaidinCapitalChangesduetoBusinessCombinations	0	USD
CY2020Q1	us-gaap	Operating Lease Cost OperatingLeaseCost	16391000	USD
CY2019Q1	us-gaap	Operating Lease Cost OperatingLeaseCost	16441000	USD
CY2020Q1	us-gaap	Variable Lease Cost VariableLeaseCost	4655000	USD
CY2019Q1	us-gaap	Variable Lease Cost VariableLeaseCost	4964000	USD
CY2020Q1	us-gaap	Sublease Income SubleaseIncome	2805000	USD
CY2019Q1	us-gaap	Sublease Income SubleaseIncome	1599000	USD
CY2020Q1	us-gaap	Lease Cost LeaseCost	18241000	USD
CY2019Q1	us-gaap	Lease Cost LeaseCost	19806000	USD
CY2020Q1	us-gaap	Operating Lease Payments OperatingLeasePayments	17635000	USD
CY2019Q1	us-gaap	Operating Lease Payments OperatingLeasePayments	15652000	USD
CY2020Q1	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	7119000	USD
CY2019Q1	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	256818000	USD
CY2020Q1	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P7Y
CY2019Q1	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P7Y3M18D
CY2020Q1	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	8.7
CY2019Q1	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	8.7
CY2020Q1	mdca	Impairmentof Right Of Use Asset ImpairmentofRightOfUseAsset	161000	USD
CY2020Q1	us-gaap	Lessee Operating Lease Liability Payments Remainder Of Fiscal Year LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear	52025000	USD
CY2020Q1	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	59901000	USD
CY2020Q1	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	49774000	USD
CY2020Q1	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	44573000	USD
CY2020Q1	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	38111000	USD
CY2020Q1	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	103505000	USD
CY2020Q1	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	347889000	USD
CY2020Q1	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	88613000	USD
CY2020Q1	mdca	Net Income Loss Including Transferfrom Non Controlling Interests NetIncomeLossIncludingTransferfromNonControllingInterests	500000	USD
CY2019Q1	mdca	Net Income Loss Including Transferfrom Non Controlling Interests NetIncomeLossIncludingTransferfromNonControllingInterests	-113000	USD
CY2020Q1	us-gaap	Long Term Line Of Credit LongTermLineOfCredit	125000000	USD
CY2019Q4	us-gaap	Long Term Line Of Credit LongTermLineOfCredit	0	USD
CY2020Q1	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	10740000	USD
CY2019Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	12370000	USD
CY2020Q1	us-gaap	Debt Longterm And Shortterm Combined Amount DebtLongtermAndShorttermCombinedAmount	1014260000	USD
CY2019Q4	us-gaap	Debt Longterm And Shortterm Combined Amount DebtLongtermAndShorttermCombinedAmount	887630000	USD
CY2020Q1	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	17576000	USD
CY2019Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	4836000	USD
CY2018Q4	mdca	Accrued And Other Liabilities Attributable To Noncontrolling Interest AccruedAndOtherLiabilitiesAttributableToNoncontrollingInterest	9278000	USD
CY2019	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	16156000	USD
CY2019	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	11392000	USD
CY2019	mdca	Adjustments To Noncontrolling Interest AdjustmentsToNoncontrollingInterest	-14000	USD
CY2019Q4	mdca	Accrued And Other Liabilities Attributable To Noncontrolling Interest AccruedAndOtherLiabilitiesAttributableToNoncontrollingInterest	14028000	USD
CY2020Q1	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	791000	USD
CY2020Q1	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	3973000	USD
CY2020Q1	mdca	Adjustments To Noncontrolling Interest AdjustmentsToNoncontrollingInterest	-856000	USD
CY2020Q1	mdca	Accrued And Other Liabilities Attributable To Noncontrolling Interest AccruedAndOtherLiabilitiesAttributableToNoncontrollingInterest	9990000	USD
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	1003000	USD
CY2019Q1	us-gaap	Net Income Loss NetIncomeLoss	-113000	USD
CY2020Q1	mdca	Adjustmentsto Additional Paidin Capital Changesdueto Business Combinations AdjustmentstoAdditionalPaidinCapitalChangesduetoBusinessCombinations	-503000	USD
CY2019Q4	us-gaap	Redeemable Noncontrolling Interest Equity Fair Value RedeemableNoncontrollingInterestEquityFairValue	36973000	USD
CY2018Q4	us-gaap	Redeemable Noncontrolling Interest Equity Fair Value RedeemableNoncontrollingInterestEquityFairValue	51546000	USD
CY2020Q1	mdca	Redeemablenoncontrollinginterestredemptionsvalue Redeemablenoncontrollinginterestredemptionsvalue	1615000	USD
CY2019	mdca	Redeemablenoncontrollinginterestredemptionsvalue Redeemablenoncontrollinginterestredemptionsvalue	14530000	USD
CY2020Q1	us-gaap	Noncontrolling Interest Increase From Business Combination NoncontrollingInterestIncreaseFromBusinessCombination	0	USD
CY2019	us-gaap	Noncontrolling Interest Increase From Business Combination NoncontrollingInterestIncreaseFromBusinessCombination	0	USD
CY2020Q1	mdca	Redeemablenoncontrollinginterestchangesinredemptionvalue Redeemablenoncontrollinginterestchangesinredemptionvalue	1218000	USD
CY2019	mdca	Redeemablenoncontrollinginterestchangesinredemptionvalue Redeemablenoncontrollinginterestchangesinredemptionvalue	-3163000	USD
CY2020Q1	mdca	Redeemable Noncontrolling Interest Currency Adjustments RedeemableNoncontrollingInterestCurrencyAdjustments	-878000	USD
CY2019	mdca	Redeemable Noncontrolling Interest Currency Adjustments RedeemableNoncontrollingInterestCurrencyAdjustments	3000	USD
CY2020Q1	mdca	Noncontrolling Interest Increasefrom Other NoncontrollingInterestIncreasefromOther	0	USD
CY2019	mdca	Noncontrolling Interest Increasefrom Other NoncontrollingInterestIncreasefromOther	3117000	USD
CY2020Q1	us-gaap	Redeemable Noncontrolling Interest Equity Fair Value RedeemableNoncontrollingInterestEquityFairValue	35698000	USD
CY2019Q4	us-gaap	Redeemable Noncontrolling Interest Equity Fair Value RedeemableNoncontrollingInterestEquityFairValue	36973000	USD
CY2020Q1	us-gaap	Redeemable Noncontrolling Interest Equity Fair Value RedeemableNoncontrollingInterestEquityFairValue	35698000	USD
CY2020Q1	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	17576000	USD
CY2020Q1	mdca	Derivative Discount Rate DerivativeDiscountRate	0.0991
CY2020Q1	mdca	Impairmentof Right Of Use Asset ImpairmentofRightOfUseAsset	161000	USD
CY2020Q1	mdca	Accrued Media Cost Current AccruedMediaCostCurrent	213915000	USD
CY2019Q4	mdca	Accrued Media Cost Current AccruedMediaCostCurrent	216931000	USD
CY2020Q1	us-gaap	Goodwill Goodwill	716407000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	731691000	USD
CY2020Q1	us-gaap	Indefinitelived Intangible Assets Acquired IndefinitelivedIntangibleAssetsAcquired	14600	USD
CY2020Q1	us-gaap	Finite Lived Intangible Assets Remaining Amortization Period1 FiniteLivedIntangibleAssetsRemainingAmortizationPeriod1	P5Y
CY2020Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	13500000	USD
CY2020Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	15294000	USD
CY2019Q1	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	883
CY2019Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	748000	USD
CY2019Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	981000	USD
CY2020Q1	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	762
CY2020Q1	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	3	reportable_segment
CY2020Q1	us-gaap	Revenues Revenues	327742000	USD
CY2019Q1	us-gaap	Revenues Revenues	328791000	USD
CY2020Q1	mdca	Adjusted Ebitda AdjustedEBITDA	39568000	USD
CY2019Q1	mdca	Adjusted Ebitda AdjustedEBITDA	21475000	USD
CY2020Q1	us-gaap	Depreciation And Amortization DepreciationAndAmortization	9206000	USD
CY2019Q1	us-gaap	Depreciation And Amortization DepreciationAndAmortization	8838000	USD
CY2020Q1	us-gaap	Asset Impairment Charges AssetImpairmentCharges	161000	USD
CY2019Q1	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0	USD
CY2020Q1	us-gaap	Share Based Compensation ShareBasedCompensation	3070000	USD
CY2019Q1	us-gaap	Share Based Compensation ShareBasedCompensation	2972000	USD
CY2020Q1	mdca	Deferred Acquisition Consideration Expense Income DeferredAcquisitionConsiderationExpenseIncome	4600000	USD
CY2019Q1	mdca	Deferred Acquisition Consideration Expense Income DeferredAcquisitionConsiderationExpenseIncome	7643000	USD
CY2020Q1	mdca	Distributions From Non Consolidated Affiliates DistributionsFromNonConsolidatedAffiliates	14000	USD
CY2019Q1	mdca	Distributions From Non Consolidated Affiliates DistributionsFromNonConsolidatedAffiliates	0	USD
CY2020Q1	us-gaap	Profit Loss ProfitLoss	1794000	USD
CY2020Q1	us-gaap	Other Nonrecurring Income Expense OtherNonrecurringIncomeExpense	-2416000	USD
CY2019Q1	us-gaap	Other Nonrecurring Income Expense OtherNonrecurringIncomeExpense	-1626000	USD
CY2019Q1	us-gaap	Profit Loss ProfitLoss	316000	USD
CY2020Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	29329000	USD
CY2020Q1	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-14757000	USD
CY2020Q1	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	791000	USD
CY2019Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	15682000	USD
CY2020Q1	us-gaap	Interest And Debt Expense InterestAndDebtExpense	15612000	USD
CY2019Q1	us-gaap	Interest And Debt Expense InterestAndDebtExpense	16760000	USD
CY2019Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	748000	USD
CY2019Q1	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	5442000	USD
CY2020Q1	mdca	Income Loss From Continuing Operations Before Equity In Earnings Of Nonconsolidated Affiliates IncomeLossFromContinuingOperationsBeforeEquityInEarningsOfNonconsolidatedAffiliates	1794000	USD
CY2019Q1	mdca	Income Loss From Continuing Operations Before Equity In Earnings Of Nonconsolidated Affiliates IncomeLossFromContinuingOperationsBeforeEquityInEarningsOfNonconsolidatedAffiliates	233000	USD
CY2020Q1	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	0	USD
CY2019Q1	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	83000	USD
CY2020Q1	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	16334000	USD
CY2019Q1	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-3383000	USD
CY2020Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	15294000	USD
CY2019Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	981000	USD
CY2020Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	13500000	USD
CY2019Q1	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	429000	USD
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	1003000	USD
CY2019Q1	us-gaap	Net Income Loss NetIncomeLoss	-113000	USD
CY2020Q1	us-gaap	Depreciation And Amortization DepreciationAndAmortization	9206000	USD
CY2019Q1	us-gaap	Depreciation And Amortization DepreciationAndAmortization	8838000	USD
CY2020Q1	us-gaap	Share Based Compensation ShareBasedCompensation	3070000	USD
CY2019Q1	us-gaap	Share Based Compensation ShareBasedCompensation	2972000	USD
CY2020Q1	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	1546000	USD
CY2019Q1	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	3606000	USD

Files In Submission

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$STGW
Stagwell Inc Stock $stgw

2020 Q1 Form 8-K Financial Statement

#000087688320000024 Filed on August 31, 2020

Income Statement

Balance Sheet

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Facts In Submission

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$STGW Stagwell Inc Stock $stgw

2020 Q1 Form 8-K Financial Statement

#000087688320000024 Filed on August 31, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$STGW
Stagwell Inc Stock $stgw