$STGW
Stagwell Inc Stock $stgw

$stgw Overview Financials Valuation SEC Filings Company Website

2020 Q4 Form 10-K Financial Statement

#000087688321000016 Filed on March 16, 2021

Income Statement

Concept	2020 Q4	2020 Q3	2020 Q2
Revenue	$328.2M	$228.1M	$259.7M
YoY Change	-14.09%	-33.48%	-28.29%
Cost Of Revenue	$209.0M	$149.0M	$165.6M
YoY Change	-19.82%	-33.01%	-31.2%
Gross Profit	$119.1M	$79.09M	$94.05M
YoY Change	-1.75%	-34.35%	-22.52%
Gross Profit Margin	36.3%	34.67%	36.22%
Selling, General & Admin	$136.5M	$72.51M	$132.6M
YoY Change	44.89%	-9.02%	51.85%
% of Gross Profit	114.58%	91.69%	140.96%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$9.468M	$9.974M	$8.898M
YoY Change	0.72%	6.11%	-16.06%
% of Gross Profit	7.95%	12.61%	9.46%
Operating Expenses	$146.0M	$81.84M	$150.7M
YoY Change	40.75%	-8.25%	53.74%
Operating Profit	-$26.83M	$26.45M	$98.00K
YoY Change	-252.89%	-10.11%	-99.58%
Interest Expense	-$9.070M	-$13.11M	-$40.97M
YoY Change	-19.73%	-34.79%	203.47%
% of Operating Profit		-49.56%	-41804.08%
Other Income/Expense, Net	-$2.223M	-$2.371M	-$4.717M
YoY Change	-201.05%	-88.44%	-66.84%
Pretax Income	-$115.4M	$24.08M	-$4.619M
YoY Change	-6509.22%	170.29%	-150.12%
Income Tax	$109.5M	$2.618M	-$7.923M
% Of Pretax Income		10.87%
Net Earnings	-$233.5M	$17.81M	-$595.0K
YoY Change	2940.6%	-1116.44%	-113.87%
Net Earnings / Revenue	-71.14%	7.81%	-0.23%
Basic Earnings Per Share	-$3.23	-$0.07	-$0.06
Diluted Earnings Per Share	-$3.23	-$0.07	-$0.06
COMMON SHARES
Basic Shares Outstanding		73.21M shares	72.53M shares
Diluted Shares Outstanding		73.48M shares	72.53M shares

Balance Sheet

Concept	2020 Q4	2020 Q3	2020 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments	$60.76M	$37.08M	$85.48M
YoY Change	-43.16%	35.81%	213.12%
Cash & Equivalents	$92.46M	$37.08M	$85.48M
Short-Term Investments
Other Short-Term Assets	$36.43M	$67.59M	$66.32M
YoY Change	2.3%	88.05%	47.98%
Inventory
Prepaid Expenses
Receivables	$225.7M	$403.6M	$359.3M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$365.7M	$530.2M	$530.5M
YoY Change	-41.2%	3.21%	-3.05%
LONG-TERM ASSETS
Property, Plant & Equipment	$35.61M	$87.91M	$70.79M
YoY Change	-56.06%	5.98%	-15.68%
Goodwill	$351.7M	$710.0M	$706.9M
YoY Change	8.16%	-4.18%	-4.93%
Intangibles	$186.0M	$46.60M	$48.90M
YoY Change	167.7%	-17.86%	-19.63%
Long-Term Investments	$3.947M
YoY Change	-35.94%
Other Assets	$17.04M	$21.49M	$27.36M
YoY Change	-43.53%	-10.51%	3.56%
Total Long-Term Assets	$648.2M	$1.176B	$1.175B
YoY Change	-46.27%	-5.02%	-6.11%
TOTAL ASSETS
Total Short-Term Assets	$365.7M	$530.2M	$530.5M
Total Long-Term Assets	$648.2M	$1.176B	$1.175B
Total Assets	$1.014B	$1.706B	$1.705B
YoY Change	-44.55%	-2.6%	-5.18%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$147.8M	$128.6M	$148.3M
YoY Change	-26.14%	-28.11%	-34.95%
Accrued Expenses	$316.2M	$363.5M	$302.9M
YoY Change	-21.39%	10.64%	0.92%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$994.0K
YoY Change
Total Short-Term Liabilities	$337.0M	$688.5M	$624.1M
YoY Change	-58.89%	-2.87%	-14.72%
LONG-TERM LIABILITIES
Long-Term Debt	$198.0M	$860.4M	$922.5M
YoY Change	-77.69%	-3.9%	0.92%
Other Long-Term Liabilities	$5.801M	$38.44M	$36.50M
YoY Change	-77.49%	114.35%	87.17%
Total Long-Term Liabilities	$203.8M	$898.9M	$959.0M
YoY Change	-77.69%	-1.58%	2.73%
TOTAL LIABILITIES
Total Short-Term Liabilities	$337.0M	$688.5M	$624.1M
Total Long-Term Liabilities	$203.8M	$898.9M	$959.0M
Total Liabilities	$614.7M	$1.851B	$1.853B
YoY Change	-68.98%	-1.76%	-3.87%
SHAREHOLDERS EQUITY
Retained Earnings	$0.00	-$476.3M	-$480.4M
YoY Change	-100.0%	2.99%	4.26%
Common Stock	$0.00	$106.0M	$98.23M
YoY Change	-100.0%	7.8%	0.8%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$358.8M	-$210.7M	-$224.8M
YoY Change
Total Liabilities & Shareholders Equity	$1.014B	$1.706B	$1.705B
YoY Change	-44.55%	-2.6%	-5.18%

Cashflow Statement

Concept	2020 Q4	2020 Q3	2020 Q2
OPERATING ACTIVITIES
Net Income	-$233.5M	$17.81M	-$595.0K
YoY Change	2940.6%	-1116.44%	-113.87%
Depreciation, Depletion And Amortization	$9.468M	$9.974M	$8.898M
YoY Change	0.72%	6.11%	-16.06%
Cash From Operating Activities	$35.05M	$31.19M	-$33.68M
YoY Change	-62.07%	-9.34%	-177.07%
INVESTING ACTIVITIES
Capital Expenditures	-$12.84M	-$7.784M	$2.144M
YoY Change	-367.42%	-232.76%	-50.34%
Acquisitions
YoY Change
Other Investing Activities	$0.00	-$2.310M	$18.33M
YoY Change	-100.0%	285.0%	-558.33%
Cash From Investing Activities	-$12.84M	-$10.09M	$14.64M
YoY Change	301.13%	55.29%	-276.42%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-1.457M	-70.54M	-1.434M
YoY Change	-84.66%	152.81%	-95.91%
NET CHANGE
Cash From Operating Activities	35.05M	31.19M	-33.68M
Cash From Investing Activities	-12.84M	-10.09M	14.64M
Cash From Financing Activities	-1.457M	-70.54M	-1.434M
Net Change In Cash	20.76M	-49.44M	-20.47M
YoY Change	-73.96%	5308794326220801000.0%	-6923.0%
FREE CASH FLOW
Cash From Operating Activities	$35.05M	$31.19M	-$33.68M
Capital Expenditures	-$12.84M	-$7.784M	$2.144M
Free Cash Flow	$47.89M	$38.97M	-$35.82M
YoY Change	-45.34%	36.56%	-190.96%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2020	dei	Entity Central Index Key EntityCentralIndexKey	0000876883
CY2020	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2020
CY2020	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2020	dei	Amendment Flag AmendmentFlag	false
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CY2020	dei	Entity Registrant Name EntityRegistrantName	MDC PARTNERS INC.
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CY2019Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	129579000	USD
CY2018Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	128546000	USD
CY2019Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	145000000	shares
CY2018Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	95000000	shares
CY2019Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	145000000	shares
CY2018Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	95000000	shares
CY2019Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	145000000	shares
CY2018Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	95000000	shares
CY2019Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	145000000	shares
CY2019	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	3	reportable_segment
CY2020	dei	Document Type DocumentType	10-K
CY2020	dei	Document Annual Report DocumentAnnualReport	true
CY2020	dei	Document Period End Date DocumentPeriodEndDate	2020-12-31
CY2020	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2020	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2020	dei	Document Transition Report DocumentTransitionReport	false
CY2020	dei	Entity File Number EntityFileNumber	001-13718
CY2020	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	Z4
CY2020	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	98-0364441
CY2020	dei	Entity Address Address Line1 EntityAddressAddressLine1	One World Trade Center
CY2020	dei	Entity Address Address Line2 EntityAddressAddressLine2	Floor 65
CY2020	dei	Entity Address City Or Town EntityAddressCityOrTown	New York
CY2020	dei	Entity Address State Or Province EntityAddressStateOrProvince	NY
CY2020	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	10007
CY2020	dei	City Area Code CityAreaCode	646
CY2020	dei	Local Phone Number LocalPhoneNumber	429-1800
CY2020	dei	Security12b Title Security12bTitle	Class A Subordinate Voting Shares, no par value
CY2020	dei	Trading Symbol TradingSymbol	MDCA
CY2020	dei	Security Exchange Name SecurityExchangeName	NASDAQ
CY2020	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	No
CY2020	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2020	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2020	dei	Entity Filer Category EntityFilerCategory	Accelerated Filer
CY2020	dei	Entity Small Business EntitySmallBusiness	true
CY2020	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
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CY2020Q4	us-gaap	Business Combination Contingent Consideration Liability Current BusinessCombinationContingentConsiderationLiabilityCurrent	53730000	USD
CY2019Q4	us-gaap	Business Combination Contingent Consideration Liability Current BusinessCombinationContingentConsiderationLiabilityCurrent	45521000	USD
CY2020Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	843184000	USD
CY2019Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	887630000	USD
CY2020Q4	us-gaap	Business Combination Contingent Consideration Liability Noncurrent BusinessCombinationContingentConsiderationLiabilityNoncurrent	29335000	USD
CY2019Q4	us-gaap	Business Combination Contingent Consideration Liability Noncurrent BusinessCombinationContingentConsiderationLiabilityNoncurrent	29699000	USD
CY2020Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	247243000	USD
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	219163000	USD
CY2020Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	82065000	USD
CY2019Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	25771000	USD
CY2020Q4	us-gaap	Liabilities Liabilities	1893087000	USD
CY2019Q4	us-gaap	Liabilities Liabilities	1981908000	USD
CY2020Q4	us-gaap	Redeemable Noncontrolling Interest Equity Fair Value RedeemableNoncontrollingInterestEquityFairValue	27137000	USD
CY2019Q4	us-gaap	Redeemable Noncontrolling Interest Equity Fair Value RedeemableNoncontrollingInterestEquityFairValue	36973000	USD
CY2020Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2019Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2020Q4	us-gaap	Preferred Stock Value PreferredStockValue	152746000	USD
CY2019Q4	us-gaap	Preferred Stock Value PreferredStockValue	152746000	USD
CY2020Q4	us-gaap	Common Stock Value CommonStockValue	104367000	USD
CY2019Q4	us-gaap	Common Stock Value CommonStockValue	101469000	USD
CY2020Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-709751000	USD
CY2019Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-480779000	USD
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	2739000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-4269000	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	-449899000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	-230833000	USD
CY2020Q4	us-gaap	Minority Interest MinorityInterest	40989000	USD
CY2019Q4	us-gaap	Minority Interest MinorityInterest	40258000	USD
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	-408910000	USD
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	-190575000	USD
CY2020Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1511314000	USD
CY2019Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1828306000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	-207197000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	10903000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	-118222000	USD
CY2020	us-gaap	Share Based Compensation ShareBasedCompensation	14179000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	31040000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	18416000	USD
CY2020	us-gaap	Depreciation And Amortization DepreciationAndAmortization	36905000	USD
CY2019	us-gaap	Depreciation And Amortization DepreciationAndAmortization	38329000	USD
CY2018	us-gaap	Depreciation And Amortization DepreciationAndAmortization	46196000	USD
CY2020	us-gaap	Asset Impairment Charges AssetImpairmentCharges	96399000	USD
CY2019	us-gaap	Asset Impairment Charges AssetImpairmentCharges	8599000	USD
CY2018	us-gaap	Asset Impairment Charges AssetImpairmentCharges	87204000	USD
CY2020	mdca	Adjustment To Deferred Acquisition Consideration AdjustmentToDeferredAcquisitionConsideration	42187000	USD
CY2019	mdca	Adjustment To Deferred Acquisition Consideration AdjustmentToDeferredAcquisitionConsideration	5403000	USD
CY2018	mdca	Adjustment To Deferred Acquisition Consideration AdjustmentToDeferredAcquisitionConsideration	-374000	USD
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	108556000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	4791000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	21585000	USD
CY2020	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	-771000	USD
CY2019	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	4107000	USD
CY2018	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	-22451000	USD
CY2020	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-72453000	USD
CY2019	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	37763000	USD
CY2018	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-31326000	USD
CY2020	mdca	Increase Decrease In Expenditures Billable To Clients IncreaseDecreaseInExpendituresBillableToClients	-19581000	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
CY2020	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-24840000	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
CY2020	mdca	Increase Decrease In Accounts Payable Accrued Expenses And Other Liabilities IncreaseDecreaseInAccountsPayableAccruedExpensesAndOtherLiabilities	-144123000	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
CY2020	us-gaap	Payment For Contingent Consideration Liability Operating Activities PaymentForContingentConsiderationLiabilityOperatingActivities	13330000	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
CY2020	mdca	Payments For Proceeds From Cash In Trust PaymentsForProceedsFromCashInTrust	0	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
CY2020	us-gaap	Increase Decrease In Deferred Revenue IncreaseDecreaseInDeferredRevenue	-18662000	USD
CY2019	us-gaap	Increase Decrease In Deferred Revenue IncreaseDecreaseInDeferredRevenue	32934000	USD
CY2018	us-gaap	Increase Decrease In Deferred Revenue IncreaseDecreaseInDeferredRevenue	-14871000	USD
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	32559000	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
CY2020	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	24310000	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
CY2020	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	19616000	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
CY2020	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	1816000	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
CY2020	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	1777000	USD
CY2019	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-484000	USD
CY2018	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-464000	USD
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-8287000	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
CY2020	us-gaap	Proceeds From Issuance Of Convertible Preferred Stock ProceedsFromIssuanceOfConvertiblePreferredStock	0	USD
CY2019	us-gaap	Proceeds From Issuance Of Convertible Preferred Stock ProceedsFromIssuanceOfConvertiblePreferredStock	98620000	USD
CY2018	us-gaap	Proceeds From Issuance Of Convertible Preferred Stock ProceedsFromIssuanceOfConvertiblePreferredStock	0	USD
CY2020	us-gaap	Payment For Contingent Consideration Liability Financing Activities PaymentForContingentConsiderationLiabilityFinancingActivities	35391000	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
CY2020	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	16036000	USD
CY2019	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	12049000	USD
CY2018	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	14537000	USD
CY2020	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	21999000	USD
CY2019	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	0	USD
CY2018	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	0	USD
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-73426000	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
CY2020	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	2978000	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
CY2020	mdca	Cash Cash Equivalents Restricted Cash Restricted Cash Equivalentsand Cash Heldin Trusts Including Cash Classified Within Assets Heldfor Sale Period Increase Decrease CashCashEquivalentsRestrictedCashRestrictedCashEquivalentsandCashHeldinTrustsIncludingCashClassifiedWithinAssetsHeldforSalePeriodIncreaseDecrease	-46176000	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
CY2020	mdca	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Decrease From Cash Classified As Assets Held For Sale CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsDecreaseFromCashClassifiedAsAssetsHeldForSale	0	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
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-46176000	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
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	106933000	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
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	60757000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	106933000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	30873000	USD
CY2020	us-gaap	Income Taxes Paid IncomeTaxesPaid	7946000	USD
CY2019	us-gaap	Income Taxes Paid IncomeTaxesPaid	2296000	USD
CY2018	us-gaap	Income Taxes Paid IncomeTaxesPaid	3836000	USD
CY2020	us-gaap	Interest Paid Net InterestPaidNet	57752000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	62223000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	64012000	USD
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	-190575000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	-228971000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	-228971000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	7738000	USD
CY2020	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	0	USD
CY2020	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	905000	USD
CY2020	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	6629000	USD
CY2020	mdca	Increase Decreasein Redemption Valueof Redeemable Noncontrolling Interests IncreaseDecreaseinRedemptionValueofRedeemableNoncontrollingInterests	-2800000	USD
CY2020	mdca	Adjustmentsto Additional Paidin Capital Changesdueto Business Combinations AdjustmentstoAdditionalPaidinCapitalChangesduetoBusinessCombinations	1626000	USD
CY2020	us-gaap	Stockholders Equity Other StockholdersEquityOther	1652000	USD
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	-408910000	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 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 Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	0	USD
CY2018	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	776000	USD
CY2018	us-gaap	Stock Issued During Period Value Acquisitions StockIssuedDuringPeriodValueAcquisitions	7030000	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	mdca	Adjustmentsto Additional Paidin Capital Changesdueto Business Combinations AdjustmentstoAdditionalPaidinCapitalChangesduetoBusinessCombinations	25550000	USD
CY2018	us-gaap	Minority Interest Change In Redemption Value MinorityInterestChangeInRedemptionValue	-5965000	USD
CY2017Q4	us-gaap	Cumulative Effect Of New Accounting Principle In Period Of Adoption CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	-1170000	USD
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	-257590000	USD
CY2020	us-gaap	Use Of Estimates UseOfEstimates	Use of Estimates. The preparation of the 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, right-of-use 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.
CY2020	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	<span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:400;line-height:120%">Concentration of Credit Risk</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">. 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 10% of the Company’s consolidated accounts receivable as of December 31, 2020 or December 31, 2019. 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, 2020, 2019, or 2018. 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>
CY2019Q4	us-gaap	Equity Method Investments EquityMethodInvestments	6161000	USD
CY2020Q4	us-gaap	Equity Method Investments EquityMethodInvestments	3947000	USD
CY2020Q4	us-gaap	Other Investments OtherInvestments	7257000	USD
CY2019Q4	us-gaap	Other Investments OtherInvestments	9854000	USD
CY2020	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	8203000	USD
CY2019	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	11909000	USD
CY2018	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	11136000	USD
CY2020Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	145000000	shares
CY2020	us-gaap	Revenues Revenues	1199011000	USD
CY2019	us-gaap	Revenues Revenues	1415803000	USD
CY2018	us-gaap	Revenues Revenues	1475088000	USD
CY2020	us-gaap	Revenues Revenues	1199011000	USD
CY2019	us-gaap	Revenues Revenues	1415803000	USD
CY2018	us-gaap	Revenues Revenues	1475088000	USD
CY2020Q4	us-gaap	Unbilled Contracts Receivable UnbilledContractsReceivable	49110000	USD
CY2019Q4	us-gaap	Unbilled Contracts Receivable UnbilledContractsReceivable	65004000	USD
CY2020Q4	mdca	Expenditures Billable Current ExpendituresBillableCurrent	10552000	USD
CY2019Q4	mdca	Expenditures Billable Current ExpendituresBillableCurrent	30133000	USD
CY2020Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	112755000	USD
CY2019Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	216931000	USD
CY2020	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	104176000	USD
CY2020	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	210078000	USD
CY2020Q4	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P1Y
CY2020Q4	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P1Y
CY2020Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	6105000	USD
CY2020Q4	us-gaap	Revenue Remaining Performance Obligation Percentage RevenueRemainingPerformanceObligationPercentage	0.92
CY2020Q4	us-gaap	Revenue Remaining Performance Obligation Percentage RevenueRemainingPerformanceObligationPercentage	0.08
CY2020	us-gaap	Net Income Loss NetIncomeLoss	-228971000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	-5253000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	-130007000	USD
CY2020	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	-243150000	USD
CY2019	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	-17557000	USD
CY2018	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	-138362000	USD
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	72862178	shares
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
CY2020	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	0	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
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	72862178	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
CY2020	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	-3.34
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
CY2020	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	-3.34
CY2019	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	-0.25
CY2018	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	-2.42
CY2020Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	226579000	USD
CY2020Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	136166000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	90413000	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
CY2020	us-gaap	Depreciation Depreciation	24598000	USD
CY2019	us-gaap	Depreciation Depreciation	25133000	USD
CY2018	us-gaap	Depreciation Depreciation	27111000	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
CY2020	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	0	USD
CY2020	us-gaap	Goodwill Written Off Related To Sale Of Business Unit GoodwillWrittenOffRelatedToSaleOfBusinessUnit	7074000	USD
CY2020	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	61661000	USD
CY2020	us-gaap	Goodwill Transfers GoodwillTransfers	0	USD
CY2020	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	5255000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	668211000	USD
CY2020	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	61661000	USD
CY2019	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	4879000	USD
CY2018	us-gaap	Asset Impairment Charges AssetImpairmentCharges	87204000	USD
CY2020Q4	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	238965000	USD
CY2019Q4	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	177304000	USD
CY2020Q4	us-gaap	Indefinite Lived Trademarks IndefiniteLivedTrademarks	0	USD
CY2019Q4	us-gaap	Indefinite Lived Trademarks IndefiniteLivedTrademarks	14600000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	85305000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	101506000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	51461000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	46613000	USD
CY2020Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	33844000	USD
CY2019Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	54893000	USD
CY2020	us-gaap	Acquired Finite Lived Intangible Assets Weighted Average Useful Life AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife	P8Y
CY2020	mdca	Amortization Of Intangible Assets Finite Lived AmortizationOfIntangibleAssetsFiniteLived	11260000	USD
CY2019	mdca	Amortization Of Intangible Assets Finite Lived AmortizationOfIntangibleAssetsFiniteLived	11828000	USD
CY2018	mdca	Amortization Of Intangible Assets Finite Lived AmortizationOfIntangibleAssetsFiniteLived	17290000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	8514000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	8062000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	7711000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	4558000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	4999000	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
CY2020	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements	-46792000	USD
CY2019	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements	-30719000	USD
CY2020	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Gain Loss Included In Earnings FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings	44993000	USD
CY2019	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Gain Loss Included In Earnings FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings	15451000	USD
CY2020	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Purchases FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases	7703000	USD
CY2019	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Purchases FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases	7145000	USD
CY2020	mdca	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Foreign Currency Translation Adjustment FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityForeignCurrencyTranslationAdjustment	2227000	USD
CY2019	mdca	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Foreign Currency Translation Adjustment FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityForeignCurrencyTranslationAdjustment	196000	USD
CY2020Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Liability Value FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue	82802000	USD
CY2019Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Liability Value FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue	74671000	USD
CY2020Q4	us-gaap	Business Combination Contingent Consideration Liability BusinessCombinationContingentConsiderationLiability	83065000	USD
CY2019Q4	us-gaap	Business Combination Contingent Consideration Liability BusinessCombinationContingentConsiderationLiability	75220000	USD
CY2020	mdca	Adjustmentstodeferredacquisitionconsiderationincludedinsharebasedcompensation Adjustmentstodeferredacquisitionconsiderationincludedinsharebasedcompensation	2806000	USD
CY2019	mdca	Adjustmentstodeferredacquisitionconsiderationincludedinsharebasedcompensation Adjustmentstodeferredacquisitionconsiderationincludedinsharebasedcompensation	10048000	USD
CY2020	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Gain Loss Included In Earnings FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings	44993000	USD
CY2019	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Gain Loss Included In Earnings FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings	15451000	USD
CY2020Q4	mdca	Lessee Operating Lease Lease Not Yet Commenced Number Of Contracts LesseeOperatingLeaseLeaseNotYetCommencedNumberOfContracts	3	lease
CY2020Q4	mdca	Lessee Operating Lease Lease Not Yet Commenced Number Of Contracts LesseeOperatingLeaseLeaseNotYetCommencedNumberOfContracts	3	lease
CY2019Q4	mdca	Lessee Operating Lease Lease Notyet Commenced Liability LesseeOperatingLeaseLeaseNotyetCommencedLiability	25900000	USD
CY2020	us-gaap	Operating Lease Cost OperatingLeaseCost	71257000	USD
CY2019	us-gaap	Operating Lease Cost OperatingLeaseCost	67044000	USD
CY2020	us-gaap	Variable Lease Cost VariableLeaseCost	14640000	USD
CY2019	us-gaap	Variable Lease Cost VariableLeaseCost	18879000	USD
CY2020	us-gaap	Sublease Income SubleaseIncome	11329000	USD
CY2019	us-gaap	Sublease Income SubleaseIncome	8965000	USD
CY2020	us-gaap	Lease Cost LeaseCost	74568000	USD
CY2019	us-gaap	Lease Cost LeaseCost	76958000	USD
CY2020	us-gaap	Operating Lease Payments OperatingLeasePayments	70277000	USD
CY2019	us-gaap	Operating Lease Payments OperatingLeasePayments	69735000	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	45663000	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	269801000	USD
CY2020Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P7Y2M12D
CY2019Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P5Y3M18D
CY2020Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.106
CY2019Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.086
CY2020	us-gaap	Operating Lease Expense OperatingLeaseExpense	22667000	USD
CY2020	us-gaap	Operating Lease Impairment Loss OperatingLeaseImpairmentLoss	9969000	USD
CY2019	us-gaap	Operating Lease Impairment Loss OperatingLeaseImpairmentLoss	3700000	USD
CY2018	us-gaap	Operating Lease Cost OperatingLeaseCost	65093000	USD
CY2018	us-gaap	Sublease Income SubleaseIncome	3671000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	68375000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	60252000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	56842000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	49909000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	38880000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	150950000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	425208000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	136757000	USD
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	288451000	USD
CY2020Q4	us-gaap	Long Term Line Of Credit LongTermLineOfCredit	0	USD
CY2019Q4	us-gaap	Long Term Line Of Credit LongTermLineOfCredit	0	USD
CY2020Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	27072000	USD
CY2019Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	12370000	USD
CY2020Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	843184000	USD
CY2019Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	887630000	USD
CY2020	us-gaap	Interest Expense Debt InterestExpenseDebt	59147000	USD
CY2019	us-gaap	Interest Expense Debt InterestExpenseDebt	62210000	USD
CY2018	us-gaap	Interest Expense Debt InterestExpenseDebt	64420000	USD
CY2020	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	3529000	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
CY2020	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	0	USD
CY2019	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	0	USD
CY2018	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	0	USD
CY2020	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	1426000	USD
CY2019	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	1640000	USD
CY2018	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	1641000	USD
CY2020	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	1924000	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
CY2020	us-gaap	Defined Benefit Plan Recognized Net Gain Loss Due To Settlements And Curtailments1 DefinedBenefitPlanRecognizedNetGainLossDueToSettlementsAndCurtailments1	-2333000	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
CY2020	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	-340000	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
CY2020	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	2175000	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
CY2019	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate	0.0339
CY2018	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate	0.0442
CY2017	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate	0.0383
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	0.0700
CY2020	us-gaap	Defined Benefit Plan Amounts Recognized In Other Comprehensive Income Loss Net Gain Loss Before Tax DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax	-2213000	USD
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
CY2020	mdca	Defined Benefit Plan Amounts Recognizedin Other Comprehensive Income Loss Amortizationof Actuarial Gain Loss Before Tax DefinedBenefitPlanAmountsRecognizedinOtherComprehensiveIncomeLossAmortizationofActuarialGainLossBeforeTax	340000	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
CY2020	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	1873000	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
CY2020	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent	4048000	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
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
CY2020	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	1426000	USD
CY2019	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	1640000	USD
CY2018	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	1641000	USD
CY2020	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	-5301000	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
CY2020	us-gaap	Defined Benefit Plan Benefit Obligation Benefits Paid DefinedBenefitPlanBenefitObligationBenefitsPaid	6728000	USD
CY2019	us-gaap	Defined Benefit Plan Benefit Obligation Benefits Paid DefinedBenefitPlanBenefitObligationBenefitsPaid	2693000	USD
CY2018	us-gaap	Defined Benefit Plan Benefit Obligation Benefits Paid DefinedBenefitPlanBenefitObligationBenefitsPaid	3931000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	43011000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	43012000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	37938000	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
CY2020	us-gaap	Defined Benefit Plan Actual Return On Plan Assets DefinedBenefitPlanActualReturnOnPlanAssets	2678000	USD
CY2019	us-gaap	Defined Benefit Plan Plan Assets Benefits Paid DefinedBenefitPlanPlanAssetsBenefitsPaid	2693000	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
CY2020	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	2325000	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
CY2020	us-gaap	Defined Benefit Plan Plan Assets Benefits Paid DefinedBenefitPlanPlanAssetsBenefitsPaid	6728000	USD
CY2018	us-gaap	Defined Benefit Plan Plan Assets Benefits Paid DefinedBenefitPlanPlanAssetsBenefitsPaid	3931000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	25481000	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
CY2020Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	17530000	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
CY2020Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	17530000	USD
CY2019Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	15806000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Amounts Recognized In Balance Sheet DefinedBenefitPlanAmountsRecognizedInBalanceSheet	17530000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Amounts Recognized In Balance Sheet DefinedBenefitPlanAmountsRecognizedInBalanceSheet	15806000	USD
CY2020Q4	mdca	Defined Benefit Plan Accumulated Other Comprehensive Income Net Settlementand Curtailmentgainlossnetoftax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetSettlementandCurtailmentgainlossnetoftax	-17403000	USD
CY2019Q4	mdca	Defined Benefit Plan Accumulated Other Comprehensive Income Net Settlementand Curtailmentgainlossnetoftax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetSettlementandCurtailmentgainlossnetoftax	-15530000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Net Gains Losses After Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesAfterTax	17403000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Net Gains Losses After Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesAfterTax	15530000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate	0.0255
CY2019Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate	0.0339
CY2020Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	25481000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	27206000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Plan Assets Target Allocation Percentage DefinedBenefitPlanPlanAssetsTargetAllocationPercentage	1.000
CY2020Q4	us-gaap	Defined Benefit Plan Weighted Average Asset Allocations DefinedBenefitPlanWeightedAverageAssetAllocations	1.000
CY2019Q4	us-gaap	Defined Benefit Plan Weighted Average Asset Allocations DefinedBenefitPlanWeightedAverageAssetAllocations	1.000
CY2020	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	2325000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Next Twelve Months DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths	1802000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Two DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo	1769000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Three DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree	1983000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Four DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour	2231000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Five DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive	2171000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Five Fiscal Years Thereafter DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter	10796000	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	mdca	Accrued And Other Liabilities Attributable To Noncontrolling Interest Distributions Made AccruedAndOtherLiabilitiesAttributableToNoncontrollingInterestDistributionsMade	11392000	USD
CY2019	mdca	Adjustments To Noncontrolling Interest AdjustmentsToNoncontrollingInterest	-14000	USD
CY2019Q4	mdca	Accrued And Other Liabilities Attributable To Noncontrolling Interest AccruedAndOtherLiabilitiesAttributableToNoncontrollingInterest	14028000	USD
CY2020	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	21774000	USD
CY2020	mdca	Accrued And Other Liabilities Attributable To Noncontrolling Interest Distributions Made AccruedAndOtherLiabilitiesAttributableToNoncontrollingInterestDistributionsMade	15192000	USD
CY2020	mdca	Adjustments To Noncontrolling Interest AdjustmentsToNoncontrollingInterest	94000	USD
CY2020Q4	mdca	Accrued And Other Liabilities Attributable To Noncontrolling Interest AccruedAndOtherLiabilitiesAttributableToNoncontrollingInterest	20704000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	-228971000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	-5253000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	-130007000	USD
CY2020	mdca	Net Income Loss Including Transferfrom Non Controlling Interests NetIncomeLossIncludingTransferfromNonControllingInterests	-227345000	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
CY2019Q4	us-gaap	Redeemable Noncontrolling Interest Equity Fair Value RedeemableNoncontrollingInterestEquityFairValue	36973000	USD
CY2018Q4	us-gaap	Redeemable Noncontrolling Interest Equity Fair Value RedeemableNoncontrollingInterestEquityFairValue	51546000	USD
CY2020	mdca	Redeemablenoncontrollinginterestredemptionsvalue Redeemablenoncontrollinginterestredemptionsvalue	12289000	USD
CY2019	mdca	Redeemablenoncontrollinginterestredemptionsvalue Redeemablenoncontrollinginterestredemptionsvalue	14530000	USD
CY2020	us-gaap	Noncontrolling Interest Increase From Business Combination NoncontrollingInterestIncreaseFromBusinessCombination	0	USD
CY2019	us-gaap	Noncontrolling Interest Increase From Business Combination NoncontrollingInterestIncreaseFromBusinessCombination	0	USD
CY2020	mdca	Redeemablenoncontrollinginterestchangesinredemptionvalue Redeemablenoncontrollinginterestchangesinredemptionvalue	-2800000	USD
CY2019	mdca	Redeemablenoncontrollinginterestchangesinredemptionvalue Redeemablenoncontrollinginterestchangesinredemptionvalue	3163000	USD
CY2020	mdca	Redeemable Noncontrolling Interest Currency Adjustments RedeemableNoncontrollingInterestCurrencyAdjustments	-347000	USD
CY2019	mdca	Redeemable Noncontrolling Interest Currency Adjustments RedeemableNoncontrollingInterestCurrencyAdjustments	3000	USD
CY2020	mdca	Change In Redeemable Noncontrolling Interest Other ChangeInRedeemableNoncontrollingInterestOther	0	USD
CY2019	mdca	Change In Redeemable Noncontrolling Interest Other ChangeInRedeemableNoncontrollingInterestOther	3117000	USD
CY2020Q4	us-gaap	Redeemable Noncontrolling Interest Equity Fair Value RedeemableNoncontrollingInterestEquityFairValue	27137000	USD
CY2019Q4	us-gaap	Redeemable Noncontrolling Interest Equity Fair Value RedeemableNoncontrollingInterestEquityFairValue	36973000	USD
CY2020Q4	us-gaap	Redeemable Noncontrolling Interest Equity Fair Value RedeemableNoncontrollingInterestEquityFairValue	27137000	USD
CY2020	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	5774000	USD
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	2460000	USD
CY2018	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	5892000	USD
CY2020	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	0	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
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
CY2020	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Reclassification Adjustments Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsNetOfTax	0	USD
CY2020	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax	8362000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	8362000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax	1354000	USD
CY2020	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
CY2020	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	1354000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	1354000	USD
CY2020	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	8362000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	7008000	USD
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	16366000	USD
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	19105000	USD
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	2739000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-88402000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	20867000	USD
CY2020	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	7999000	USD
CY2019	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	5525000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-88669000	USD
CY2018	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	8030000	USD
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	108556000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	4791000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	21585000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	116555000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	10316000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	29615000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-88402000	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
CY2020	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	-18564000	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
CY2020	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	-3486000	USD
CY2019	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	1496000	USD
CY2018	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	-3944000	USD
CY2020	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	1162000	USD
CY2019	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	3823000	USD
CY2018	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	1512000	USD
CY2020	mdca	Effective Income Tax Rate Reconciliation Global Intangible Low Taxed Income Amount EffectiveIncomeTaxRateReconciliationGlobalIntangibleLowTaxedIncomeAmount	1363000	USD
CY2019	mdca	Effective Income Tax Rate Reconciliation Global Intangible Low Taxed Income Amount EffectiveIncomeTaxRateReconciliationGlobalIntangibleLowTaxedIncomeAmount	1147000	USD
CY2018	mdca	Effective Income Tax Rate Reconciliation Global Intangible Low Taxed Income Amount EffectiveIncomeTaxRateReconciliationGlobalIntangibleLowTaxedIncomeAmount	710000	USD
CY2020	mdca	Effective Income Tax Rate Reconciliation Base Erosion And Anti Abuse Tax Amount EffectiveIncomeTaxRateReconciliationBaseErosionAndAntiAbuseTaxAmount	4697000	USD
CY2019	mdca	Effective Income Tax Rate Reconciliation Base Erosion And Anti Abuse Tax Amount EffectiveIncomeTaxRateReconciliationBaseErosionAndAntiAbuseTaxAmount	2504000	USD
CY2018	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	49482000	USD
CY2018	mdca	Effective Income Tax Rate Reconciliation Base Erosion And Anti Abuse Tax Amount EffectiveIncomeTaxRateReconciliationBaseErosionAndAntiAbuseTaxAmount	389000	USD
CY2020	us-gaap	Income Tax Reconciliation Nondeductible Expense Other IncomeTaxReconciliationNondeductibleExpenseOther	1043000	USD
CY2019	us-gaap	Income Tax Reconciliation Nondeductible Expense Other IncomeTaxReconciliationNondeductibleExpenseOther	273000	USD
CY2018	us-gaap	Income Tax Reconciliation Nondeductible Expense Other IncomeTaxReconciliationNondeductibleExpenseOther	1388000	USD
CY2020	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	128938000	USD
CY2019	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-2830000	USD
CY2020	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	67000	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
CY2020	us-gaap	Income Tax Reconciliation Minority Interest Income Expense IncomeTaxReconciliationMinorityInterestIncomeExpense	4649000	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
CY2020	mdca	Effective Income Tax Rate Reconciliation Increase Decrease Foreign Tax Credits Amount EffectiveIncomeTaxRateReconciliationIncreaseDecreaseForeignTaxCreditsAmount	1160000	USD
CY2019	mdca	Effective Income Tax Rate Reconciliation Increase Decrease Foreign Tax Credits Amount EffectiveIncomeTaxRateReconciliationIncreaseDecreaseForeignTaxCreditsAmount	2724000	USD
CY2018	mdca	Effective Income Tax Rate Reconciliation Increase Decrease Foreign Tax Credits Amount EffectiveIncomeTaxRateReconciliationIncreaseDecreaseForeignTaxCreditsAmount	612000	USD
CY2020	us-gaap	Income Tax Reconciliation Nondeductible Expense Impairment Losses IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses	10158000	USD
CY2019	us-gaap	Income Tax Reconciliation Nondeductible Expense Impairment Losses IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses	436000	USD
CY2018	us-gaap	Income Tax Reconciliation Nondeductible Expense Impairment Losses IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses	8703000	USD
CY2020	us-gaap	Income Tax Reconciliation Prior Year Income Taxes IncomeTaxReconciliationPriorYearIncomeTaxes	4641000	USD
CY2019	us-gaap	Income Tax Reconciliation Prior Year Income Taxes IncomeTaxReconciliationPriorYearIncomeTaxes	-3544000	USD
CY2018	us-gaap	Income Tax Reconciliation Prior Year Income Taxes IncomeTaxReconciliationPriorYearIncomeTaxes	1192000	USD
CY2020	us-gaap	Deferred Other Tax Expense Benefit DeferredOtherTaxExpenseBenefit	-9999000	USD
CY2019	us-gaap	Deferred Other Tax Expense Benefit DeferredOtherTaxExpenseBenefit	1920000	USD
CY2018	us-gaap	Deferred Other Tax Expense Benefit DeferredOtherTaxExpenseBenefit	-8845000	USD
CY2020	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	24000	USD
CY2019	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	129000	USD
CY2018	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-137000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	116555000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	10316000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	29615000	USD
CY2020	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	-1.318
CY2019	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.494
CY2018	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	-0.334
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	116555000	USD
CY2019Q4	us-gaap	Taxes Payable Current And Noncurrent TaxesPayableCurrentAndNoncurrent	11722000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-88402000	USD
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
CY2020Q4	us-gaap	Income Tax Receivable IncomeTaxReceivable	1480000	USD
CY2019Q4	us-gaap	Income Tax Receivable IncomeTaxReceivable	5025000	USD
CY2020Q4	us-gaap	Taxes Payable Current And Noncurrent TaxesPayableCurrentAndNoncurrent	9238000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Property Plant And Equipment DeferredTaxAssetsPropertyPlantAndEquipment	20831000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Property Plant And Equipment DeferredTaxAssetsPropertyPlantAndEquipment	10987000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	47139000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	60705000	USD
CY2020Q4	mdca	Deferred Tax Assets Interest Deductions DeferredTaxAssetsInterestDeductions	20819000	USD
CY2019Q4	mdca	Deferred Tax Assets Interest Deductions DeferredTaxAssetsInterestDeductions	16797000	USD
CY2020Q4	mdca	Deferred Tax Assets Refinancing Charge DeferredTaxAssetsRefinancingCharge	0	USD
CY2019Q4	mdca	Deferred Tax Assets Refinancing Charge DeferredTaxAssetsRefinancingCharge	669000	USD
CY2020Q4	mdca	Deferred Tax Assets Deferred Acquisition Consideration DeferredTaxAssetsDeferredAcquisitionConsideration	122045000	USD
CY2019Q4	mdca	Deferred Tax Assets Deferred Acquisition Consideration DeferredTaxAssetsDeferredAcquisitionConsideration	117421000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	1693000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	1736000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Pensions DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions	4856000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Pensions DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions	4414000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Unrealized Currency Losses DeferredTaxAssetsUnrealizedCurrencyLosses	11995000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Unrealized Currency Losses DeferredTaxAssetsUnrealizedCurrencyLosses	11373000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Capital Loss Carryforwards DeferredTaxAssetsCapitalLossCarryforwards	13657000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Capital Loss Carryforwards DeferredTaxAssetsCapitalLossCarryforwards	13081000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Reserves DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves	77870000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Reserves DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves	76397000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	320905000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	313580000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	198452000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	65649000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	122453000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	247931000	USD
CY2019Q4	mdca	Deferred Tax Liabilities Operating Lease Liability DeferredTaxLiabilitiesOperatingLeaseLiability	67613000	USD
CY2020Q4	mdca	Deferred Tax Liabilities Operating Lease Liability DeferredTaxLiabilitiesOperatingLeaseLiability	57890000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	382000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssets	88326000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Financing Arrangements DeferredTaxLiabilitiesFinancingArrangements	1675000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Financing Arrangements DeferredTaxLiabilitiesFinancingArrangements	0	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Deferred Expense DeferredTaxLiabilitiesDeferredExpense	475000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Deferred Expense DeferredTaxLiabilitiesDeferredExpense	546000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	1893000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssets	98677000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	150259000	USD
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CY2019Q4	mdca	Undistributed Earningsof Foreign Subsidiaries Amount No Longer Subjectto Permanent Reinvestment Assertion UndistributedEarningsofForeignSubsidiariesAmountNoLongerSubjecttoPermanentReinvestmentAssertion	5462000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1066000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1107000	USD
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CY2019Q4	mdca	Income Tax Reserve IncomeTaxReserve	996000	USD
CY2018Q4	mdca	Income Tax Reserve IncomeTaxReserve	887000	USD
CY2017Q4	mdca	Income Tax Reserve IncomeTaxReserve	1433000	USD
CY2020	mdca	Current Year Positions Changesin Reserve CurrentYearPositionsChangesinReserve	581000	USD
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CY2018	mdca	Prior Period Positions Changesin Reserve PriorPeriodPositionsChangesinReserve	7000	USD
CY2020	mdca	Settlement Of Uncertainty SettlementOfUncertainty	0	USD
CY2019	mdca	Settlement Of Uncertainty SettlementOfUncertainty	0	USD
CY2018	mdca	Settlement Of Uncertainty SettlementOfUncertainty	314000	USD
CY2020	mdca	Lapseofstatuteoflimitations Lapseofstatuteoflimitations	170000	USD
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CY2019	mdca	Lapseofstatuteoflimitations Lapseofstatuteoflimitations	166000	USD
CY2018	mdca	Lapseofstatuteoflimitations Lapseofstatuteoflimitations	239000	USD
CY2020Q4	mdca	Income Tax Reserve IncomeTaxReserve	1407000	USD
CY2019Q4	mdca	Income Tax Reserve IncomeTaxReserve	996000	USD
CY2018Q4	mdca	Income Tax Reserve IncomeTaxReserve	887000	USD
CY2020	mdca	Unrecognized Tax Benefits Reduction To Deferred Tax Asset UnrecognizedTaxBenefitsReductionToDeferredTaxAsset	477000	USD
CY2020	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	61661000	USD
CY2019	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	4879000	USD
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CY2020	us-gaap	Operating Lease Impairment Loss OperatingLeaseImpairmentLoss	9969000	USD
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CY2019	us-gaap	Revenues Revenues	1415803000	USD
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CY2020	mdca	Adjusted Ebitda AdjustedEBITDA	177332000	USD
CY2018	us-gaap	Depreciation And Amortization DepreciationAndAmortization	46196000	USD
CY2019	mdca	Adjusted Ebitda AdjustedEBITDA	174153000	USD
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CY2019	us-gaap	Asset Impairment Charges AssetImpairmentCharges	8599000	USD
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CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	31040000	USD
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CY2020	mdca	Deferred Acquisition Consideration Expense Income DeferredAcquisitionConsiderationExpenseIncome	-42187000	USD
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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
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	116555000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	10316000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	29615000	USD
CY2020	mdca	Income Loss From Continuing Operations Before Equity In Earnings Of Nonconsolidated Affiliates IncomeLossFromContinuingOperationsBeforeEquityInEarningsOfNonconsolidatedAffiliates	-204957000	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
CY2020	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-2240000	USD
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CY2019	us-gaap	Profit Loss ProfitLoss	10903000	USD
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CY2020	mdca	Income Lossfrom Continuing Operations Attributableto Parent Diluted IncomeLossfromContinuingOperationsAttributabletoParentDiluted	-243150000	USD
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CY2019Q3	us-gaap	Revenues Revenues	342907000	USD
CY2020Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.03
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CY2019Q4	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	260725000	USD
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CY2020Q4	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	209043000	USD
CY2019Q1	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	237154000	USD
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CY2020Q1	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	1794000	USD
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CY2020Q3	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	14804000	USD
CY2020Q4	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	-226303000	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
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	-1752000	USD
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CY2019Q4	us-gaap	Share Based Compensation ShareBasedCompensation	18408000	USD
CY2020Q4	us-gaap	Business Combination Contingent Consideration Arrangements Change In Amount Of Contingent Consideration Liability1 BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1	41672000	USD
CY2019Q4	us-gaap	Business Combination Contingent Consideration Arrangements Change In Amount Of Contingent Consideration Liability1 BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1	9030000	USD
CY2020Q4	us-gaap	Asset Impairment Charges AssetImpairmentCharges	77240000	USD
CY2019Q4	us-gaap	Asset Impairment Charges AssetImpairmentCharges	6655000	USD

Files In Submission

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$STGW
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2020 Q4 Form 10-K Financial Statement

#000087688321000016 Filed on March 16, 2021

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$STGW Stagwell Inc Stock $stgw

2020 Q4 Form 10-K Financial Statement

#000087688321000016 Filed on March 16, 2021

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Files In Submission

$STGW
Stagwell Inc Stock $stgw