$MTCH
Match Group, Inc. Stock $mtch

$mtch Overview Financials Valuation SEC Filings Company Website

2019 Q4 Form 10-K Financial Statement

#000089110320000004 Filed on February 28, 2020

Income Statement

Concept	2019 Q4	2019 Q3	2019 Q2
Revenue	$547.2M	$541.5M	$498.0M
YoY Change	-50.44%	-50.98%	-52.98%
Cost Of Revenue	$294.6M	$296.4M	$276.4M
YoY Change	16.1%	24.93%	26.65%
Gross Profit	$252.6M	$245.1M	$221.6M
YoY Change	-70.3%	-71.74%	-73.65%
Gross Profit Margin	46.16%	45.27%	44.5%
Selling, General & Admin	$169.3M	$182.2M	$158.2M
YoY Change	9.01%	-68.45%	-71.66%
% of Gross Profit	67.03%	74.35%	71.37%
Research & Development	$38.40M	$36.61M	$32.68M
YoY Change	14.63%	-52.91%	-56.68%
% of Gross Profit	15.2%	14.94%	14.75%
Depreciation & Amortization	$16.00M	$8.533M	$8.752M
YoY Change	58.42%	-5.19%	-53.46%
% of Gross Profit	6.33%	3.48%	3.95%
Operating Expenses	$223.7M	$218.9M	$190.8M
YoY Change	12.41%	-66.61%	-69.87%
Operating Profit	$181.3M	$175.2M	$171.3M
YoY Change	35.42%	1.39%	1.71%
Interest Expense	-$42.00M	$38.99M	$33.55M
YoY Change	4.74%	41.23%	22.62%
% of Operating Profit	-23.16%	22.25%	19.58%
Other Income/Expense, Net	-$4.500M	$2.788M	$2.538M
YoY Change	-260.71%	-65.64%	-98.52%
Pretax Income	$134.9M	$139.0M	$140.3M
YoY Change	22.75%	-9.33%	-55.06%
Income Tax	$15.00M	$1.200M	$21.10M
% Of Pretax Income	11.12%	0.86%	15.04%
Net Earnings	$124.3M	$128.5M	$113.5M
YoY Change	-42.86%	-11.82%	-48.04%
Net Earnings / Revenue	22.71%	23.74%	22.79%
Basic Earnings Per Share	$0.59	$0.75	$0.65
Diluted Earnings Per Share	$0.51	$0.64	$0.56
COMMON SHARES
Basic Shares Outstanding		182.2M shares	181.6M shares
Diluted Shares Outstanding		193.2M shares	194.5M shares

Balance Sheet

Concept	2019 Q4	2019 Q3	2019 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments	$485.7M	$523.6M	$428.1M
YoY Change	56.57%	-72.14%	-75.75%
Cash & Equivalents	$465.7M	$366.4M	$266.4M
Short-Term Investments	$19.99M	$157.2M	$161.7M
Other Short-Term Assets	$97.85M	$225.0M	$234.9M
YoY Change	-57.13%	-8.6%	-1.29%
Inventory
Prepaid Expenses	$55.70M
Receivables	$116.5M	$355.9M	$365.5M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$3.708B	$3.684B	$3.914B
YoY Change	34.22%	48.99%	66.79%
LONG-TERM ASSETS
Property, Plant & Equipment	$101.1M	$361.7M	$361.6M
YoY Change	-68.3%	17.25%	17.92%
Goodwill	$1.240B	$2.853B	$2.893B
YoY Change	-0.42%	10.92%	12.2%
Intangibles	$228.3M	$603.7M	$628.4M
YoY Change	-63.84%	-3.27%	-1.25%
Long-Term Investments		$9.100M	$0.00
YoY Change
Other Assets	$64.23M	$120.1M	$103.9M
YoY Change	-52.39%	30.18%	18.47%
Total Long-Term Assets	$4.737B	$4.620B	$4.385B
YoY Change	15.19%	18.49%	12.77%
TOTAL ASSETS
Total Short-Term Assets	$3.708B	$3.684B	$3.914B
Total Long-Term Assets	$4.737B	$4.620B	$4.385B
Total Assets	$8.445B	$8.305B	$8.299B
YoY Change	22.84%	30.33%	33.1%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$20.20M	$22.20M	$13.80M
YoY Change	112.63%	83.47%	18.97%
Accrued Expenses	$182.3M	$507.3M	$433.1M
YoY Change	-58.09%	20.18%	14.67%
Deferred Revenue	$218.8M	$414.3M	$402.2M
YoY Change	4.24%	8.63%	7.21%
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$13.75M	$13.75M	$13.75M
YoY Change	0.0%	0.0%	0.0%
Total Short-Term Liabilities	$1.010B	$1.036B	$953.5M
YoY Change	14.33%	15.98%	12.75%
LONG-TERM LIABILITIES
Long-Term Debt	$3.240B	$3.112B	$3.139B
YoY Change	44.29%	56.85%	58.33%
Other Long-Term Liabilities	$26.16M	$215.6M	$223.5M
YoY Change	-60.85%	488.7%	535.33%
Total Long-Term Liabilities	$3.266B	$3.327B	$3.362B
YoY Change	41.25%	64.68%	66.65%
TOTAL LIABILITIES
Total Short-Term Liabilities	$1.010B	$1.036B	$953.5M
Total Long-Term Liabilities	$3.266B	$3.327B	$3.362B
Total Liabilities	$4.276B	$4.364B	$4.315B
YoY Change	33.81%	49.75%	50.73%
SHAREHOLDERS EQUITY
Retained Earnings	$1.725B	$1.590B	$1.461B
YoY Change	37.04%	48.96%	58.58%
Common Stock	$11.38B	$11.76B	$11.96B
YoY Change	-5.36%	-1.62%	-0.43%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$10.31B	$10.31B	$10.31B
YoY Change	0.0%	0.0%	0.67%
Treasury Stock Shares	194.7M shares	194.7M shares	194.7M shares
Shareholders Equity	$2.658B	$2.897B	$2.983B
YoY Change
Total Liabilities & Shareholders Equity	$8.445B	$8.305B	$8.299B
YoY Change	22.84%	30.33%	33.1%

Cashflow Statement

Concept	2019 Q4	2019 Q3	2019 Q2
OPERATING ACTIVITIES
Net Income	$124.3M	$128.5M	$113.5M
YoY Change	-42.86%	-11.82%	-48.04%
Depreciation, Depletion And Amortization	$16.00M	$8.533M	$8.752M
YoY Change	58.42%	-5.19%	-53.46%
Cash From Operating Activities	$249.1M	$333.0M	$263.3M
YoY Change	-55.75%	83.27%	117.24%
INVESTING ACTIVITIES
Capital Expenditures	-$8.700M	-$9.400M	-$11.00M
YoY Change	-13.86%	44.62%	12.24%
Acquisitions
YoY Change
Other Investing Activities	$86.50M	-$265.2M	-$112.9M
YoY Change	-161.7%		6172.22%
Cash From Investing Activities	$77.80M	-$274.6M	-$123.9M
YoY Change	-151.76%	4124.62%	968.1%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-135.7M	-261.3M	843.1M
YoY Change	235.06%	217.5%	-1090.72%
NET CHANGE
Cash From Operating Activities	249.1M	333.0M	263.3M
Cash From Investing Activities	77.80M	-274.6M	-123.9M
Cash From Financing Activities	-135.7M	-261.3M	843.1M
Net Change In Cash	191.2M	-202.9M	982.5M
YoY Change	-48.62%	-318.41%	3910.2%
FREE CASH FLOW
Cash From Operating Activities	$249.1M	$333.0M	$263.3M
Capital Expenditures	-$8.700M	-$9.400M	-$11.00M
Free Cash Flow	$257.8M	$342.4M	$274.3M
YoY Change	-55.01%	81.93%	109.39%

Facts In Submission

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CY2018	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	5000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-4026000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-9966000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-31406000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	76243000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	533854000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	726341000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	434251000	USD
CY2019	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	112689000	USD
CY2018	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	130786000	USD
CY2017	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	53084000	USD
CY2019	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest	-2023000	USD
CY2018	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest	-6129000	USD
CY2017	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest	13797000	USD
CY2019	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest	-1000	USD
CY2018	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest	1000	USD
CY2017	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest	0	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	110665000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	124658000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	66881000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	423189000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	601683000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	367370000	USD
CY2016Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2010670000	USD
CY2017	us-gaap	Net Income Loss Including Portion Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest	354388000	USD
CY2017	iaci	Other Comprehensive Income Loss Netof Tax Including Portion Attributableto Nonredeemable Noncontrolling Interest Total OtherComprehensiveIncomeLossNetofTaxIncludingPortionAttributabletoNonredeemableNoncontrollingInterestTotal	74952000	USD
CY2017	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	246388000	USD
CY2017	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	-10504000	USD
CY2017	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	50121000	USD
CY2017	us-gaap	Minority Interest Decrease From Redemptions MinorityInterestDecreaseFromRedemptions	848000	USD
CY2017	us-gaap	Noncontrolling Interest Increase From Business Combination NoncontrollingInterestIncreaseFromBusinessCombination	779471000	USD
CY2017	iaci	Adjustmentsto Additional Paidin Capital Purchaseof Exchangeable Note Hedge AdjustmentstoAdditionalPaidinCapitalPurchaseofExchangeableNoteHedge	74365000	USD
CY2017	us-gaap	Adjustments To Additional Paid In Capital Equity Component Of Convertible Debt AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt	71158000	USD
CY2017	iaci	Temporary Equity Changein Redemption Value TemporaryEquityChangeinRedemptionValue	6341000	USD
CY2017	iaci	Issuanceof Common Stock Pursuantto Stock Based Awards Netof Withholding Taxes IssuanceofCommonStockPursuanttoStockBasedAwardsNetofWithholdingTaxes	-472702000	USD
CY2017	us-gaap	Adjustments To Additional Paid In Capital Warrant Issued AdjustmentsToAdditionalPaidInCapitalWarrantIssued	23650000	USD
CY2017	us-gaap	Stockholders Equity Other StockholdersEquityOther	-1027000	USD
CY2017Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2946823000	USD
CY2018Q1	us-gaap	Cumulative Effect Of New Accounting Principle In Period Of Adoption CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	40205000	USD
CY2018	us-gaap	Net Income Loss Including Portion Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest	723850000	USD
CY2018	iaci	Other Comprehensive Income Loss Netof Tax Including Portion Attributableto Nonredeemable Noncontrolling Interest Total OtherComprehensiveIncomeLossNetofTaxIncludingPortionAttributabletoNonredeemableNoncontrollingInterestTotal	-30704000	USD
CY2018	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	237282000	USD
CY2018	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	21786000	USD
CY2018	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	82891000	USD
CY2018	us-gaap	Minority Interest Decrease From Redemptions MinorityInterestDecreaseFromRedemptions	9364000	USD
CY2018	iaci	Temporary Equity Changein Redemption Value TemporaryEquityChangeinRedemptionValue	-4098000	USD
CY2018	iaci	Issuanceof Common Stock Pursuantto Stock Based Awards Netof Withholding Taxes IssuanceofCommonStockPursuanttoStockBasedAwardsNetofWithholdingTaxes	-200694000	USD
CY2018	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	105126000	USD
CY2018	iaci	Temporary Equity Created In Acquisition TemporaryEquityCreatedInAcquisition	14307000	USD
CY2018	us-gaap	Stockholders Equity Other StockholdersEquityOther	-425000	USD
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	3551801000	USD
CY2019	us-gaap	Net Income Loss Including Portion Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest	540985000	USD
CY2019	iaci	Other Comprehensive Income Loss Netof Tax Including Portion Attributableto Nonredeemable Noncontrolling Interest Total OtherComprehensiveIncomeLossNetofTaxIncludingPortionAttributabletoNonredeemableNoncontrollingInterestTotal	-10005000	USD
CY2019	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	238076000	USD
CY2019	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	-82462000	USD
CY2019	iaci	Temporary Equity Changein Redemption Value TemporaryEquityChangeinRedemptionValue	-11554000	USD
CY2019	iaci	Issuanceof Common Stock Pursuantto Stock Based Awards Netof Withholding Taxes IssuanceofCommonStockPursuanttoStockBasedAwardsNetofWithholdingTaxes	-238376000	USD
CY2019	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	274302000	USD
CY2019	iaci	Adjustmentsto Additional Paidin Capital Purchaseof Exchangeable Note Hedge AdjustmentstoAdditionalPaidinCapitalPurchaseofExchangeableNoteHedge	303428000	USD
CY2019	us-gaap	Adjustments To Additional Paid In Capital Equity Component Of Convertible Debt AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt	320998000	USD
CY2019	us-gaap	Adjustments To Additional Paid In Capital Warrant Issued AdjustmentsToAdditionalPaidInCapitalWarrantIssued	166520000	USD
CY2019	us-gaap	Stockholders Equity Other StockholdersEquityOther	-65000	USD
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	3898318000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	543820000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	757747000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	358008000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	240788000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	238420000	USD
CY2017	us-gaap	Share Based Compensation ShareBasedCompensation	264618000	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	92595000	USD
CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	108399000	USD
CY2017	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	42143000	USD
CY2019	us-gaap	Depreciation Depreciation	88399000	USD
CY2018	us-gaap	Depreciation Depreciation	75360000	USD
CY2017	us-gaap	Depreciation Depreciation	74265000	USD
CY2019	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	65803000	USD
CY2018	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	48445000	USD
CY2017	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	28930000	USD
CY2019	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	3318000	USD
CY2018	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2017	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-80101000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-34679000	USD
CY2017	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-285278000	USD
CY2019	us-gaap	Unrealized Gain Loss On Investments UnrealizedGainLossOnInvestments	37581000	USD
CY2018	us-gaap	Unrealized Gain Loss On Investments UnrealizedGainLossOnInvestments	152044000	USD
CY2017	us-gaap	Unrealized Gain Loss On Investments UnrealizedGainLossOnInvestments	34927000	USD
CY2019	iaci	Gain Losson Dispositionof Businessand Investments GainLossonDispositionofBusinessandInvestments	-8239000	USD
CY2018	iaci	Gain Losson Dispositionof Businessand Investments GainLossonDispositionofBusinessandInvestments	119955000	USD
CY2017	iaci	Gain Losson Dispositionof Businessand Investments GainLossonDispositionofBusinessandInvestments	-2254000	USD
CY2019	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-45546000	USD
CY2018	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-15763000	USD
CY2017	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-61647000	USD
CY2019	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	91435000	USD
CY2018	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	34828000	USD
CY2017	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	115169000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	17661000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	44557000	USD
CY2017	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-5688000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	41882000	USD
CY2018	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	53555000	USD
CY2017	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-25289000	USD
CY2019	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	-3287000	USD
CY2018	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	27034000	USD
CY2017	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	655000	USD
CY2019	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	37614000	USD
CY2018	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	49468000	USD
CY2017	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	39154000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	937939000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	988128000	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	416699000	USD
CY2019	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	205726000	USD
CY2018	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	64496000	USD
CY2017	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	146553000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	136652000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	85634000	USD
CY2019	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	163500000	USD
CY2018	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	333600000	USD
CY2017	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	114350000	USD
CY2019	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	59639000	USD
CY2018	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	449676000	USD
CY2017	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	29891000	USD
CY2017	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	75523000	USD
CY2018	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-1887000	USD
CY2019	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	165124000	USD
CY2018	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	136719000	USD
CY2017	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	185778000	USD
CY2019	us-gaap	Payments To Acquire Longterm Investments PaymentsToAcquireLongtermInvestments	253663000	USD
CY2018	us-gaap	Payments To Acquire Longterm Investments PaymentsToAcquireLongtermInvestments	52980000	USD
CY2017	us-gaap	Payments To Acquire Longterm Investments PaymentsToAcquireLongtermInvestments	9106000	USD
CY2019	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	2473000	USD
CY2018	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-9027000	USD
CY2017	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-2994000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-329529000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-173440000	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	42049000	USD
CY2019	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	303428000	USD
CY2018	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	0	USD
CY2017	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	74365000	USD
CY2019	us-gaap	Proceeds From Issuance Of Warrants ProceedsFromIssuanceOfWarrants	166520000	USD
CY2018	us-gaap	Proceeds From Issuance Of Warrants ProceedsFromIssuanceOfWarrants	0	USD
CY2017	us-gaap	Proceeds From Issuance Of Warrants ProceedsFromIssuanceOfWarrants	23650000	USD
CY2019	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	27815000	USD
CY2018	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	5449000	USD
CY2017	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	33744000	USD
CY2019	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	0	USD
CY2018	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	105126000	USD
CY2017	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	0	USD
CY2019	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	29184000	USD
CY2018	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	22498000	USD
CY2017	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	20184000	USD
CY2019	us-gaap	Payment For Contingent Consideration Liability Financing Activities PaymentForContingentConsiderationLiabilityFinancingActivities	0	USD
CY2018	us-gaap	Payment For Contingent Consideration Liability Financing Activities PaymentForContingentConsiderationLiabilityFinancingActivities	185000	USD
CY2017	us-gaap	Payment For Contingent Consideration Liability Financing Activities PaymentForContingentConsiderationLiabilityFinancingActivities	27289000	USD
CY2019	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-3868000	USD
CY2018	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	1060000	USD
CY2017	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-255000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	399831000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-312798000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-196869000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	1008241000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	501890000	USD
CY2017	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	261879000	USD
CY2019	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-1568000	USD
CY2017	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	11604000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	1006673000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	500003000	USD
CY2017	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	273483000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	2133685000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1633682000	USD
CY2016Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1360199000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	3140358000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	2133685000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1633682000	USD
CY2019	us-gaap	Nature Of Operations NatureOfOperations	ORGANIZATION<div style="line-height:120%;padding-bottom:16px;text-indent:30px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">IAC operates Vimeo and Dotdash, among many other online businesses, and also has majority ownership of both Match Group, which includes Tinder, Match, PlentyOfFish, OkCupid and Hinge, and ANGI Homeservices, which includes HomeAdvisor, Angie’s List and Handy.</span></div><div style="line-height:120%;padding-bottom:16px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-weight:bold;">Separation</span></div><div style="line-height:120%;padding-bottom:17px;text-align:left;text-indent:30px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">On December 19, 2019, IAC/InterActiveCorp ("IAC") entered into a Transaction Agreement (the "Transaction Agreement") with Match Group, Inc. ("MTCH"), IAC Holdings, Inc., a direct wholly owned subsidiary of IAC ("New IAC"), and Valentine Merger Sub LLC, an indirect wholly owned subsidiary of IAC. Subject to the terms and conditions set forth in the Transaction Agreement, the businesses of MTCH will be separated from the remaining businesses of IAC through a series of transactions that will result in the pre-transaction stockholders of IAC owning shares in two, separate public companies—(1) IAC, which will be renamed Match Group, Inc. ("New Match") and which will own the businesses of MTCH and certain IAC financing subsidiaries, and (2) New IAC, which will be renamed IAC/InterActiveCorp and which will own IAC's other businesses—and the pre-transaction stockholders of MTCH (other than IAC) owning shares in New Match. Completion of the Separation, which is expected to occur in mid-second quarter of 2020, is subject to a number of conditions, including approval by a majority of the disinterested shareholders of MTCH, approval of IAC’s shareholders and other customary conditions and approvals. We refer to the full separation as the "Separation".</span></div><div style="line-height:120%;padding-bottom:16px;text-indent:30px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">As used herein, "IAC," the "Company," "we," "our" or "us" and similar terms refer to IAC/InterActiveCorp and its subsidiaries (unless the context requires otherwise).</span></div><div style="line-height:120%;padding-bottom:16px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-weight:bold;">Match Group</span></div><div style="line-height:120%;padding-bottom:16px;text-indent:32px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">Our Match Group segment consists of the businesses and operations of Match Group, Inc. ("Match Group" or "MTCH").</span></div><div style="line-height:120%;padding-bottom:16px;text-indent:32px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">MTCH completed its initial public offering ("IPO") on November 24, 2015. At </span><span style="font-family:inherit;font-size:10pt;">December 31, 2019</span><span style="font-family:inherit;font-size:10pt;">, IAC’s economic interest and voting interest in MTCH were </span><span style="font-family:inherit;font-size:10pt;"><span>80.7%</span></span><span style="font-family:inherit;font-size:10pt;"> and </span><span style="font-family:inherit;font-size:10pt;"><span>97.5%</span></span><span style="font-family:inherit;font-size:10pt;">, respectively.</span></div><div style="line-height:120%;padding-bottom:16px;text-align:left;text-indent:30px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">MTCH is a leading provider of dating products available in over 40 languages to our users all over the world through applications and websites that we own and operate. MTCH operates a portfolio of dating brands, including Tinder, Match, Meetic, OkCupid, Hinge, Pairs, PlentyOfFish and OurTime, as well as a number of other brands, each designed to increase users' likelihood of finding a meaningful connection. Through our portfolio of trusted brands, we provide tailored products to meet the varying preferences of our users.</span></div><div style="line-height:120%;padding-bottom:16px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-weight:bold;">ANGI Homeservices</span></div><div style="line-height:120%;padding-bottom:16px;text-indent:30px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">Our ANGI Homeservices segment includes the North American (United States and Canada) and European businesses and operations of ANGI Homeservices Inc. ("ANGI"). On September 29, 2017, the Company's HomeAdvisor business and Angie's List Inc. ("Angie's List") combined under a new publicly traded company called ANGI Homeservices Inc. (the "Combination"). At </span><span style="font-family:inherit;font-size:10pt;">December 31, 2019</span><span style="font-family:inherit;font-size:10pt;">, IAC’s economic interest and voting interest in ANGI were </span><span style="font-family:inherit;font-size:10pt;"><span>84.1%</span></span><span style="font-family:inherit;font-size:10pt;"> and </span><span style="font-family:inherit;font-size:10pt;"><span>98.1%</span></span><span style="font-family:inherit;font-size:10pt;">, respectively.</span></div><div style="line-height:120%;padding-bottom:16px;text-align:left;text-indent:30px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">ANGI connects quality home service professionals across 500 different categories, from repairing and remodeling to cleaning and landscaping, with consumers. Over 250,000 domestic service professionals find work through ANGI and consumers turn to at least one of our brands to find a professional for more than 25 million projects each year. We established category-transforming products with brands such as HomeAdvisor, Angie's List, Handy and Fixd Repair.</span></div><div style="line-height:120%;padding-bottom:16px;text-indent:30px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">On January 25, 2019, ANGI completed the acquisition of Fixd Repair, a home warranty and service company. On October 19, 2018, ANGI acquired Handy, a leading platform in the United States for connecting individuals looking for household services (primarily cleaning and handyman services) with top-quality, pre-screened independent service professionals. ANGI also owns and operates mHelpDesk, a provider of cloud-based field service software for small to mid-size businesses. Prior to its sale on December 31, 2018, ANGI also operated Felix, a pay-per-call advertising service business. In addition to its market-leading U.S. operations, ANGI owns leading home services online marketplaces in France (Travaux), Germany (MyHammer), Netherlands (Werkspot), United Kingdom (MyBuilder Limited or "MyBuilder," which we acquired a </span></div><div style="line-height:120%;padding-bottom:16px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">controlling interest in on March 24, 2017), Canada (HomeStars Inc. or "HomeStars," which we acquired a controlling interest in on February 8, 2017) and Italy (Instapro), as well as operations in Austria (MyHammer).</span></div><div style="line-height:120%;padding-bottom:16px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-weight:bold;">Vimeo</span></div><div style="line-height:120%;padding-bottom:16px;text-align:left;text-indent:24px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">Vimeo operates a global video platform for creative professionals, small and medium businesses ("SMBs"), organizations and enterprises to connect with their audiences, customers and employees. Vimeo provides cloud-based Software-as-a-Service ("SaaS") offerings that allow customers to create, host, stream, monetize, analyze and distribute videos online and across devices. Vimeo also sold live streaming accessories through its hardware business, which was sold on March 29, 2019.</span></div><div style="line-height:120%;padding-bottom:16px;text-indent:24px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">On May 28, 2019, Vimeo completed the acquisition of Magisto, a video creation service enabling consumers and businesses to create short-form videos.</span></div><div style="line-height:120%;padding-bottom:16px;text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-weight:bold;">Dotdash</span></div><div style="line-height:120%;padding-bottom:16px;text-align:left;text-indent:24px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">Dotdash is a portfolio of digital publishing brands providing expert information and inspiration in select vertical content categories.</span></div><div style="line-height:120%;padding-bottom:16px;text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-weight:bold;">Applications</span></div><div style="line-height:120%;padding-bottom:16px;text-align:left;text-indent:24px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">Our Applications segment consists of our Desktop business and Mosaic Group, our mobile business. Through these businesses, we are a leading provider of global, advertising-driven desktop and subscription-based mobile applications.</span></div><div style="line-height:120%;padding-bottom:16px;text-align:left;text-indent:24px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">Through our Desktop business, we own and operate a portfolio of desktop browser applications that provide users with access to a wide variety of online content, tools and services. We provide users who download our desktop browser applications with new tab search services, as well as the option of default browser search services. We distribute our desktop browser applications to consumers free of charge on an opt-in basis directly through direct-to-consumer (primarily Chrome Web Store) and partnership distribution channels.</span></div><div style="line-height:120%;padding-bottom:16px;text-align:left;text-indent:24px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">Through Mosaic Group, we are a leading provider of global subscription mobile applications. Mosaic Group's products are developed by the following owned and operated businesses: Apalon, iTranslate, acquired in March 2018, TelTech, acquired in October 2018, and, effective April 1, 2018 upon its transfer from Emerging & Other, Daily Burn.</span></div><div style="line-height:120%;padding-bottom:16px;text-align:left;text-indent:24px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">Apalon is a leading mobile development company with one of the largest and most popular application portfolios worldwide. iTranslate develops and distributes some of the world's most downloaded mobile translation applications, enabling users to read, write, speak and learn foreign languages anywhere in the world. TelTech develops and distributes unique and innovative mobile communications applications that help protect consumer privacy. Daily Burn is a health and fitness business that provides streaming fitness and workout videos across a variety of platforms (including mobile, web and other Internet-enabled television platforms).</span></div><div style="line-height:120%;padding-bottom:16px;text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-weight:bold;">Emerging & Other</span></div><div style="line-height:120%;padding-bottom:16px;text-indent:30px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">Our Emerging & Other segment primarily includes:</span></div><table cellpadding="0" cellspacing="0" style="padding-top:8px;padding-bottom:8px;font-family:Times New Roman; font-size:10pt;"><tr><td style="width:48px;"/><td/></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><span style="font-family:inherit;font-size:10pt;">•</span></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">Ask Media Group, a collection of websites providing general search services, and to a lesser extent, content that help users find the information they need;</span></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-top:8px;padding-bottom:8px;font-family:Times New Roman; font-size:10pt;"><tr><td style="width:48px;"/><td/></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><span style="font-family:inherit;font-size:10pt;">•</span></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">Bluecrew, a technology driven staffing platform exclusively for flexible W-2 work, which we acquired a controlling interest in on February 26, 2018;</span></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-top:8px;padding-bottom:8px;font-family:Times New Roman; font-size:10pt;"><tr><td style="width:48px;"/><td/></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><span style="font-family:inherit;font-size:10pt;">•</span></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">NurseFly, a platform to efficiently connect temporary healthcare professionals with job opportunities, which we acquired a controlling interest in on June 26, 2019;</span></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-top:8px;padding-bottom:8px;font-family:Times New Roman; font-size:10pt;"><tr><td style="width:48px;"/><td/></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><span style="font-family:inherit;font-size:10pt;">•</span></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">The Daily Beast, a website dedicated to news, commentary, culture and entertainment that publishes original reporting and opinion from its roster of full-time journalists and contributors;</span></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-top:8px;padding-bottom:8px;font-family:Times New Roman; font-size:10pt;"><tr><td style="width:48px;"/><td/></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><span style="font-family:inherit;font-size:10pt;">•</span></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">College Humor Media, a provider of digital content, including its subscription only property, Dropout.tv; </span></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-top:8px;padding-bottom:8px;font-family:Times New Roman; font-size:10pt;"><tr><td style="width:48px;"/><td/></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><span style="font-family:inherit;font-size:10pt;">•</span></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">IAC Films, a provider of production and producer services for feature films, primarily for initial sale and distribution through theatrical releases and video-on-demand services in the United States and internationally; and</span></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-top:8px;padding-bottom:8px;font-family:Times New Roman; font-size:10pt;"><tr><td style="width:48px;"/><td/></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><span style="font-family:inherit;font-size:10pt;">•</span></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">For periods prior to their sales:</span></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-top:8px;padding-bottom:8px;font-family:Times New Roman; font-size:10pt;"><tr><td style="width:96px;"/><td/></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:72px;"><span style="font-family:inherit;font-size:10pt;">◦</span></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">CityGrid, an advertising network that integrated local content and advertising for distribution to affiliated and third-party publishers across web and mobile platforms, sold December 31, 2018.</span></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-top:8px;padding-bottom:8px;font-family:Times New Roman; font-size:10pt;"><tr><td style="width:96px;"/><td/></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:72px;"><span style="font-family:inherit;font-size:10pt;">◦</span></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">Dictionary.com, an online and mobile dictionary and thesaurus service, sold November 13, 2018.</span></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-top:8px;padding-bottom:8px;font-family:Times New Roman; font-size:10pt;"><tr><td style="width:96px;"/><td/></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:72px;"><span style="font-family:inherit;font-size:10pt;">◦</span></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">Electus, including Notional, a provider of production and producer services for both unscripted and scripted television and digital content, primarily for initial sale and distribution in the United States, sold October 29, 2018.</span></div></td></tr></table><div style="line-height:120%;font-size:10pt;padding-left:72px;"><span style="font-family:inherit;font-size:10pt;">◦</span></div><div style="line-height:120%;text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">The Princeton Review, a provider of educational test preparation, academic tutoring and college counseling services, sold on March 31, 2017.</span></div>
CY2019	us-gaap	Use Of Estimates UseOfEstimates	<div style="line-height:120%;padding-bottom:16px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-weight:bold;">Accounting Estimates</span></div><div style="line-height:120%;padding-bottom:16px;text-indent:32px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">Management of the Company is required to make certain estimates, judgments and assumptions during the preparation of its consolidated financial statements in accordance with GAAP. These estimates, judgments and assumptions impact the </span></div><div style="line-height:120%;padding-bottom:16px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">reported amounts of assets, liabilities, revenue and expenses and the related disclosure of contingent assets and liabilities. Actual results could differ from these estimates.</span></div><div style="line-height:120%;padding-bottom:16px;text-indent:30px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">On an ongoing basis, the Company evaluates its estimates and judgments, including those related to: the fair values of cash equivalents and marketable debt securities; the carrying value of accounts receivable, including the determination of the allowance for doubtful accounts; the determination of revenue reserves; the carrying value of right-of-use assets ("ROU assets"); the useful lives and recoverability of definite-lived intangible assets and property and equipment; the recoverability of goodwill and indefinite-lived intangible assets; the fair value of equity securities without readily determinable fair values; contingencies; the fair value of acquisition-related contingent consideration arrangements; unrecognized tax benefits; the valuation allowance for deferred income tax assets; and the fair value of and forfeiture rates for stock-based awards, among others. The Company bases its estimates and judgments on historical experience, its forecasts and budgets and other factors that the Company considers relevant.</span></div>
CY2019	us-gaap	Capitalized Contract Cost Amortization CapitalizedContractCostAmortization	464600000	USD
CY2018	us-gaap	Capitalized Contract Cost Amortization CapitalizedContractCostAmortization	355300000	USD
CY2019Q4	us-gaap	Contract With Customer Asset Net Current ContractWithCustomerAssetNetCurrent	71500000	USD
CY2018Q4	us-gaap	Contract With Customer Asset Net Current ContractWithCustomerAssetNetCurrent	69800000	USD
CY2018Q1	us-gaap	Contract With Customer Asset Net Current ContractWithCustomerAssetNetCurrent	53400000	USD
CY2019Q4	us-gaap	Contract With Customer Asset Net Noncurrent ContractWithCustomerAssetNetNoncurrent	6200000	USD
CY2018Q4	us-gaap	Contract With Customer Asset Net Noncurrent ContractWithCustomerAssetNetNoncurrent	4500000	USD
CY2018Q1	us-gaap	Contract With Customer Asset Net Noncurrent ContractWithCustomerAssetNetNoncurrent	4700000	USD
CY2019Q4	us-gaap	Goodwill Fair Value Disclosure GoodwillFairValueDisclosure	265100000	USD
CY2019Q4	iaci	Excessof Goodwill Value Over Carrying Value Percent ExcessofGoodwillValueOverCarryingValuePercent	0.10
CY2019Q4	us-gaap	Indefinite Lived Intangible Assets Excluding Goodwill Fair Value Disclosure IndefiniteLivedIntangibleAssetsExcludingGoodwillFairValueDisclosure	121200000	USD
CY2019	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	3300000	USD
CY2019	us-gaap	Minority Interest Change In Redemption Value MinorityInterestChangeInRedemptionValue	1	USD
CY2019	iaci	Accounts Receivable Periodof Payment Due AccountsReceivablePeriodofPaymentDue	P30D
CY2019Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	398800000	USD
CY2018Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	361700000	USD
CY2018Q1	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	332200000	USD
CY2019	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	356400000	USD
CY2018	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	330200000	USD
CY2019Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	397500000	USD
CY2018Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	360000000.0	USD
CY2019Q4	us-gaap	Contract With Customer Liability Noncurrent ContractWithCustomerLiabilityNoncurrent	1300000	USD
CY2018Q4	us-gaap	Contract With Customer Liability Noncurrent ContractWithCustomerLiabilityNoncurrent	1700000	USD
CY2019	iaci	Cash Equivalents Maturity Period At Purchase Less Than CashEquivalentsMaturityPeriodAtPurchaseLessThan	P91D
CY2019	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	<div style="line-height:120%;padding-bottom:16px;text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-weight:bold;">Certain Risks and Concentrations</span></div><div style="line-height:120%;padding-bottom:17px;text-align:left;text-indent:34px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">A meaningful portion of the Company's revenue is attributable to a services agreement with Google (the "Services Agreement"). In addition, the Company earns certain other advertising revenue from Google that is not attributable to the Services Agreement. For the years ended </span><span style="font-family:inherit;font-size:10pt;">December 31, 2019</span><span style="font-family:inherit;font-size:10pt;">, </span><span style="font-family:inherit;font-size:10pt;">2018</span><span style="font-family:inherit;font-size:10pt;"> and </span><span style="font-family:inherit;font-size:10pt;">2017</span><span style="font-family:inherit;font-size:10pt;">, consolidated revenue earned from Google was </span><span style="font-family:inherit;font-size:10pt;"><span>$733.5 million</span></span><span style="font-family:inherit;font-size:10pt;">, </span><span style="font-family:inherit;font-size:10pt;"><span>$825.2 million</span></span><span style="font-family:inherit;font-size:10pt;"> and </span><span style="font-family:inherit;font-size:10pt;"><span>$740.7 million</span></span><span style="font-family:inherit;font-size:10pt;">, respectively, representing </span><span style="font-family:inherit;font-size:10pt;"><span>15%</span></span><span style="font-family:inherit;font-size:10pt;">, </span><span style="font-family:inherit;font-size:10pt;"><span>19%</span></span><span style="font-family:inherit;font-size:10pt;">, and </span><span style="font-family:inherit;font-size:10pt;"><span>22%</span></span><span style="font-family:inherit;font-size:10pt;">, respectively, of the Company's consolidated revenue. Accounts receivable related to revenue earned from Google totaled </span><span style="font-family:inherit;font-size:10pt;"><span>$53.0 million</span></span><span style="font-family:inherit;font-size:10pt;"> and </span></div><div style="line-height:120%;padding-bottom:17px;text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><span>$69.1 million</span></span><span style="font-family:inherit;font-size:10pt;"> at </span><span style="font-family:inherit;font-size:10pt;">December 31, 2019</span><span style="font-family:inherit;font-size:10pt;"> and </span><span style="font-family:inherit;font-size:10pt;">2018</span><span style="font-family:inherit;font-size:10pt;">, respectively.</span></div><div style="line-height:120%;padding-bottom:17px;text-align:left;text-indent:34px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">Revenue attributable to the Services Agreement is earned by the Desktop business within the Applications segment and Ask Media Group within the Emerging & Other segment. For the years ended </span><span style="font-family:inherit;font-size:10pt;">December 31, 2019</span><span style="font-family:inherit;font-size:10pt;">, </span><span style="font-family:inherit;font-size:10pt;">2018</span><span style="font-family:inherit;font-size:10pt;"> and </span><span style="font-family:inherit;font-size:10pt;">2017</span><span style="font-family:inherit;font-size:10pt;">, revenue earned from the Services Agreement was </span><span style="font-family:inherit;font-size:10pt;"><span>$291.1 million</span></span><span style="font-family:inherit;font-size:10pt;">, </span><span style="font-family:inherit;font-size:10pt;"><span>$426.5 million</span></span><span style="font-family:inherit;font-size:10pt;"> and </span><span style="font-family:inherit;font-size:10pt;"><span>$480.6 million</span></span><span style="font-family:inherit;font-size:10pt;">, respectively, within the Applications segment and </span><span style="font-family:inherit;font-size:10pt;"><span>$385.9 million</span></span><span style="font-family:inherit;font-size:10pt;">, </span><span style="font-family:inherit;font-size:10pt;"><span>$339.0 million</span></span><span style="font-family:inherit;font-size:10pt;"> and </span><span style="font-family:inherit;font-size:10pt;"><span>$203.5 million</span></span><span style="font-family:inherit;font-size:10pt;">, respectively, within the Emerging & Other segment.</span></div><div style="line-height:120%;padding-bottom:17px;text-align:left;text-indent:34px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">The current Services Agreement expires on March 31, 2020. On February 11, 2019, the Company and Google amended the Services Agreement, effective as of April 1, 2020. The amendment extends the expiration date of the agreement to March 31, 2023; provided that during September 2020 and during each September thereafter, either party may, after discussion with the other party, terminate the services agreement, effective on September 30 of the year following the year such notice is given. The Company believes that the amended agreement, taken as a whole, is comparable to the Company’s currently existing agreement with Google. The Services Agreement requires that the Company comply with certain guidelines promulgated by Google. Google may generally unilaterally update its policies and guidelines without advance notice. These updates may be specific to the Services Agreement or could be more general and thereby impact the Company as well as other companies. These policy and guideline updates could in turn require modifications to, or prohibit and/or render obsolete certain of our products, services and/or business practices, which could be costly to address or otherwise have an adverse effect on our consolidated financial condition and results of operations, particularly our Desktop business and Ask Media Group. As described below, Google has made changes to the policies under the Services Agreement and has also made industry-wide changes that have negatively impacted the Desktop business during both 2018 and 2019. </span></div><div style="line-height:120%;padding-bottom:17px;text-align:left;text-indent:34px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">Google’s policy changes related to its Chrome browser, which became effective on September 12, 2018, negatively impacted the distribution of our B2C downloadable desktop products. The resultant reduction in projected profits and revenues of this business resulted in a </span><span style="font-family:inherit;font-size:10pt;"><span>$27.7 million</span></span><span style="font-family:inherit;font-size:10pt;"> impairment of the B2C trade name, which was recorded in the fourth quarter of 2018. On May 31, 2019, Google announced industry-wide policy changes, which became effective on July 1, 2019, related to all extensions distributed through the Chrome Web Store. These industry-wide changes, combined with other changes to polices under the Services Agreement during the second half of 2019, have had a negative impact on the historical and expected future results of operations of the Desktop business. As of </span><span style="font-family:inherit;font-size:10pt;">December 31, 2019</span><span style="font-family:inherit;font-size:10pt;">, the goodwill balance of the Desktop reporting unit and the carrying value of the related intangible asset are </span><span style="font-family:inherit;font-size:10pt;"><span>$265.1 million</span></span><span style="font-family:inherit;font-size:10pt;"> and </span><span style="font-family:inherit;font-size:10pt;"><span>$28.9 million</span></span><span style="font-family:inherit;font-size:10pt;">, respectively. The fair values of the Desktop reporting unit and the related intangible asset approximate their carrying values; therefore, a modest reduction in the fair values of the Desktop reporting unit or the related intangible asset would result in an impairment charge, which would be equal to the excess of the carrying value over the fair value of such assets.</span></div><div style="line-height:120%;padding-bottom:17px;text-align:left;text-indent:34px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">The Company’s business is subject to certain risks and concentrations including dependence on third-party technology providers, exposure to risks associated with online commerce security and credit card fraud.</span></div><div style="line-height:120%;padding-bottom:17px;text-align:left;text-indent:34px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">Financial instruments, which potentially subject the Company to concentration of credit risk, consist primarily of cash and cash equivalents and marketable debt securities. Cash and cash equivalents are maintained with financial institutions and are in excess of Federal Deposit Insurance Corporation insurance limits.</span></div>
CY2019	us-gaap	Advertising Expense AdvertisingExpense	1200000000	USD
CY2018	us-gaap	Advertising Expense AdvertisingExpense	1200000000	USD
CY2017	us-gaap	Advertising Expense AdvertisingExpense	1100000000	USD
CY2019	us-gaap	Acquired Finite Lived Intangible Assets Weighted Average Useful Life AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife	P18M
CY2018	us-gaap	Minority Interest Change In Redemption Value MinorityInterestChangeInRedemptionValue	2	USD
CY2019	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	<div style="line-height:120%;padding-bottom:16px;text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-weight:bold;">Reclassifications</span></div><div style="line-height:120%;padding-bottom:16px;text-align:left;text-indent:30px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">Certain prior year amounts have been reclassified to conform to the current year presentation.</span></div>
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	370073000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	630417000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	-52606000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	124438000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	131141000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	119564000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	494511000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	761558000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	66958000	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	278000	USD
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-2849000	USD
CY2017	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-31844000	USD
CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	807000	USD
CY2018	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	2569000	USD
CY2017	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	1964000	USD
CY2019	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	29707000	USD
CY2018	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	38770000	USD
CY2017	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	24108000	USD
CY2019	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	30792000	USD
CY2018	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	38490000	USD
CY2017	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-5772000	USD
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-52985000	USD
CY2018	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-21792000	USD
CY2017	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-255477000	USD
CY2019	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-25128000	USD
CY2018	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	172000	USD
CY2017	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-28364000	USD
CY2019	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-1988000	USD
CY2019Q4	us-gaap	Tax Credit Carryforward Amount TaxCreditCarryforwardAmount	159500000	USD
CY2019	iaci	Tax Credit Carryforwards Not Subject To Expiration TaxCreditCarryforwardsNotSubjectToExpiration	41200000	USD
CY2019	iaci	Tax Credit Carryforward Amount Expiring Within Ten Years TaxCreditCarryforwardAmountExpiringWithinTenYears	118300000	USD
CY2018	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-13059000	USD
CY2017	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-1437000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-80101000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-34679000	USD
CY2017	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-285278000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-49309000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3811000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-291050000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	340472000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	291639000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	117286000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	89397000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	79108000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	82698000	USD
CY2019Q4	iaci	Deferred Tax Assets Noncurrent Lease Liabilities DeferredTaxAssetsNoncurrentLeaseLiabilities	52748000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	71328000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	53631000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	660942000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	517365000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	129620000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	115853000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	531322000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	401512000	USD
CY2019Q4	iaci	Deferred Tax Liabilities Investment In Subsidiaries DeferredTaxLiabilitiesInvestmentInSubsidiaries	235920000	USD
CY2018Q4	iaci	Deferred Tax Liabilities Investment In Subsidiaries DeferredTaxLiabilitiesInvestmentInSubsidiaries	238650000	USD
CY2019Q4	iaci	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets And Other DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssetsAndOther	70830000	USD
CY2018Q4	iaci	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets And Other DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssetsAndOther	77669000	USD
CY2019Q4	iaci	Deferred Tax Liabilities Rightof Use Assets DeferredTaxLiabilitiesRightofUseAssets	39226000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Investments DeferredTaxLiabilitiesInvestments	0	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Investments DeferredTaxLiabilitiesInvestments	22927000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	39680000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	21080000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	385656000	USD
CY2018Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	360326000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	145666000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	41186000	USD
CY2019	iaci	Income Tax Expense Benefit Related To Operating Loss Carryforwards IncomeTaxExpenseBenefitRelatedToOperatingLossCarryforwards	-40800000	USD
CY2019	iaci	Income Tax Expense Benefit Relatedto Operating Loss Carryforwards Recordedas Increase Decreasein Goodwill IncomeTaxExpenseBenefitRelatedtoOperatingLossCarryforwardsRecordedasIncreaseDecreaseinGoodwill	-26900000	USD
CY2019	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	-13800000	USD
CY2019Q4	iaci	Deferred Tax Assets Valuation Allowance Amount DeferredTaxAssetsValuationAllowanceAmount	129600000	USD
CY2019	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	103847000	USD
CY2018	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	159927000	USD
CY2017	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	23435000	USD
CY2019	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	6146000	USD
CY2018	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	16794000	USD
CY2017	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	782000	USD
CY2019	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	-135179000	USD
CY2018	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	-129654000	USD
CY2017	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	-358901000	USD
CY2019	us-gaap	Income Tax Reconciliation Tax Credits Research IncomeTaxReconciliationTaxCreditsResearch	33377000	USD
CY2018	us-gaap	Income Tax Reconciliation Tax Credits Research IncomeTaxReconciliationTaxCreditsResearch	14276000	USD
CY2017	us-gaap	Income Tax Reconciliation Tax Credits Research IncomeTaxReconciliationTaxCreditsResearch	6947000	USD
CY2019	iaci	Effective Income Tax Rate Reconciliation Realizationof Deferred Tax Assets EffectiveIncomeTaxRateReconciliationRealizationofDeferredTaxAssets	9281000	USD
CY2018	iaci	Effective Income Tax Rate Reconciliation Realizationof Deferred Tax Assets EffectiveIncomeTaxRateReconciliationRealizationofDeferredTaxAssets	13200000	USD
CY2017	iaci	Effective Income Tax Rate Reconciliation Realizationof Deferred Tax Assets EffectiveIncomeTaxRateReconciliationRealizationofDeferredTaxAssets	3133000	USD
CY2019	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	-3333000	USD
CY2018	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	-3206000	USD
CY2017	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	-14725000	USD
CY2019	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	890000	USD
CY2018	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	-7488000	USD
CY2017	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	705000	USD
CY2017	iaci	Income Tax Reconciliation Nondeductible Expense Impairment Losses Related To Cost Method Investments IncomeTaxReconciliationNondeductibleExpenseImpairmentLossesRelatedToCostMethodInvestments	2669000	USD
CY2019	iaci	Effective Income Tax Rate Reconciliation Transition Tax EffectiveIncomeTaxRateReconciliationTransitionTax	0	USD
CY2018	iaci	Effective Income Tax Rate Reconciliation Transition Tax EffectiveIncomeTaxRateReconciliationTransitionTax	-9190000	USD
CY2017	iaci	Effective Income Tax Rate Reconciliation Transition Tax EffectiveIncomeTaxRateReconciliationTransitionTax	62667000	USD
CY2019	iaci	Effective Income Tax Rate Reconciliation Withholding Taxes Amount EffectiveIncomeTaxRateReconciliationWithholdingTaxesAmount	7304000	USD
CY2018	iaci	Effective Income Tax Rate Reconciliation Withholding Taxes Amount EffectiveIncomeTaxRateReconciliationWithholdingTaxesAmount	5165000	USD
CY2017	iaci	Effective Income Tax Rate Reconciliation Withholding Taxes Amount EffectiveIncomeTaxRateReconciliationWithholdingTaxesAmount	562000	USD
CY2019	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	13674000	USD
CY2018	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-1061000	USD
CY2017	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	1836000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-49309000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3811000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-291050000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	48875000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	36732000	USD
CY2016Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	38372000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	14000000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	10334000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	2050000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	8949000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	4716000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	1994000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	289000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	400000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	3761000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2019	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	1302000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	2507000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	1923000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	70233000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	48875000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	36732000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	4100000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	3400000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued	1100000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued	1400000	USD
CY2019Q4	iaci	Unrecognized Tax Benefits Including Tax Interest Accrued UnrecognizedTaxBenefitsIncludingTaxInterestAccrued	74400000	USD
CY2018Q4	iaci	Unrecognized Tax Benefits Including Tax Interest Accrued UnrecognizedTaxBenefitsIncludingTaxInterestAccrued	52300000	USD
CY2019Q4	iaci	Unrecognized Tax Benefits Unrelated To Federal Income Taxes Statute Of Limitations Expiring To Be Recognized In Subsequent Periods That Would Income Impact Tax Expense Continuing Operations UnrecognizedTaxBenefitsUnrelatedToFederalIncomeTaxesStatuteOfLimitationsExpiringToBeRecognizedInSubsequentPeriodsThatWouldIncomeImpactTaxExpenseContinuingOperations	69200000	USD
CY2018Q4	iaci	Unrecognized Tax Benefits Unrelated To Federal Income Taxes Statute Of Limitations Expiring To Be Recognized In Subsequent Periods That Would Income Impact Tax Expense Continuing Operations UnrecognizedTaxBenefitsUnrelatedToFederalIncomeTaxesStatuteOfLimitationsExpiringToBeRecognizedInSubsequentPeriodsThatWouldIncomeImpactTaxExpenseContinuingOperations	49100000	USD
CY2019Q4	iaci	Change In Unrecognized Tax Benefits Unrelated To The Federal Income Taxes Statute Of Limitations Expiring Reasonably Possible Within Twelve Months Of The Current Reporting Period ChangeInUnrecognizedTaxBenefitsUnrelatedToTheFederalIncomeTaxesStatuteOfLimitationsExpiringReasonablyPossibleWithinTwelveMonthsOfTheCurrentReportingPeriod	24500000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	24300000	USD
	us-gaap	Tax Cuts And Jobs Act Of2017 Measurement Period Adjustment Income Tax Expense Benefit TaxCutsAndJobsActOf2017MeasurementPeriodAdjustmentIncomeTaxExpenseBenefit	-9200000	USD
CY2019Q4	us-gaap	Deferred Tax Liability Not Recognized Amount Of Unrecognized Deferred Tax Liability Undistributed Earnings Of Foreign Subsidiaries DeferredTaxLiabilityNotRecognizedAmountOfUnrecognizedDeferredTaxLiabilityUndistributedEarningsOfForeignSubsidiaries	2100000	USD
CY2019Q4	iaci	Undistributed Earningsof Foreign Subsidiaries Indefinitely Reinvested Outsideof Domestic Country UndistributedEarningsofForeignSubsidiariesIndefinitelyReinvestedOutsideofDomesticCountry	41800000	USD
CY2019Q4	us-gaap	Undistributed Earnings Of Foreign Subsidiaries UndistributedEarningsOfForeignSubsidiaries	171200000	USD
CY2017	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	3529600000	USD
CY2017	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	364496000	USD
CY2017	us-gaap	Business Acquisition Pro Forma Earnings Per Share Basic BusinessAcquisitionProFormaEarningsPerShareBasic	4.55
CY2017	us-gaap	Business Acquisition Pro Forma Earnings Per Share Diluted BusinessAcquisitionProFormaEarningsPerShareDiluted	4.27
CY2019Q4	us-gaap	Goodwill Goodwill	2854462000	USD
CY2018Q4	us-gaap	Goodwill Goodwill	2726859000	USD
CY2019Q4	us-gaap	Indefinite Lived Intangible Assets Excluding Goodwill IndefiniteLivedIntangibleAssetsExcludingGoodwill	446495000	USD
CY2018Q4	us-gaap	Indefinite Lived Intangible Assets Excluding Goodwill IndefiniteLivedIntangibleAssetsExcludingGoodwill	458104000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	131979000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	173318000	USD
CY2019Q4	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	3432936000	USD
CY2018Q4	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	3358281000	USD
CY2018Q4	us-gaap	Goodwill Goodwill	2726859000	USD
CY2019	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	168866000	USD
CY2019	iaci	Goodwill Deductions During Period GoodwillDeductionsDuringPeriod	29267000	USD
CY2019	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	3318000	USD
CY2019	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	-8678000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	2854462000	USD
CY2017Q4	us-gaap	Goodwill Goodwill	2559066000	USD
CY2018	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	208423000	USD
CY2018	iaci	Goodwill Deductions During Period GoodwillDeductionsDuringPeriod	22188000	USD
CY2018	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	-18442000	USD
CY2018Q4	us-gaap	Goodwill Goodwill	2726859000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	347177000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	215198000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	131979000	USD
CY2019	us-gaap	Finite Lived Intangible Asset Useful Life FiniteLivedIntangibleAssetUsefulLife	P3Y9M18D
CY2018Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	309723000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	136405000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	173318000	USD
CY2018	us-gaap	Finite Lived Intangible Asset Useful Life FiniteLivedIntangibleAssetUsefulLife	P3Y9M18D
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	63844000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	27454000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	22781000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	12870000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	1766000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive	3264000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	131979000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	19993000	USD
CY2018Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	123246000	USD
CY2019Q4	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	0	USD
CY2018Q4	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	419000	USD
CY2019Q4	iaci	Debt Securities Tradingand Equity Securities Fvni DebtSecuritiesTradingandEquitySecuritiesFVNI	19993000	USD
CY2018Q4	iaci	Debt Securities Tradingand Equity Securities Fvni DebtSecuritiesTradingandEquitySecuritiesFVNI	123665000	USD
CY2019Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	19993000	USD
CY2019Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	0	USD
CY2019Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	0	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Securities Current AvailableForSaleSecuritiesDebtSecuritiesCurrent	19993000	USD
CY2019	iaci	Contractual Maturityof Current Availablefor Sale Securities ContractualMaturityofCurrentAvailableforSaleSecurities	P1Y
CY2019Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	0	USD
CY2018Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	123246000	USD
CY2018Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	3000	USD
CY2018Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	3000	USD
CY2018Q4	us-gaap	Available For Sale Securities Debt Securities Current AvailableForSaleSecuritiesDebtSecuritiesCurrent	123246000	USD
CY2019	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	163500000	USD
CY2018	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	333600000	USD
CY2017	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	114350000	USD
CY2019	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	0	USD
CY2019Q4	us-gaap	Equity Securities Without Readily Determinable Fair Value Amount EquitySecuritiesWithoutReadilyDeterminableFairValueAmount	353052000	USD
CY2018Q4	us-gaap	Equity Securities Without Readily Determinable Fair Value Amount EquitySecuritiesWithoutReadilyDeterminableFairValueAmount	235055000	USD
CY2019Q4	us-gaap	Long Term Investments LongTermInvestments	353052000	USD
CY2018Q4	us-gaap	Long Term Investments LongTermInvestments	235055000	USD
CY2019	us-gaap	Equity Securities Without Readily Determinable Fair Value Upward Price Adjustment Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueUpwardPriceAdjustmentAnnualAmount	19698000	USD
CY2018	us-gaap	Equity Securities Without Readily Determinable Fair Value Upward Price Adjustment Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueUpwardPriceAdjustmentAnnualAmount	128986000	USD
CY2019	us-gaap	Equity Securities Without Readily Determinable Fair Value Downward Price Adjustment Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueDownwardPriceAdjustmentAnnualAmount	5193000	USD
CY2018	us-gaap	Equity Securities Without Readily Determinable Fair Value Downward Price Adjustment Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueDownwardPriceAdjustmentAnnualAmount	4931000	USD
CY2019	iaci	Equity Securitieswithout Readily Determinable Fair Value Annual Amount EquitySecuritieswithoutReadilyDeterminableFairValueAnnualAmount	14505000	USD
CY2018	iaci	Equity Securitieswithout Readily Determinable Fair Value Annual Amount EquitySecuritieswithoutReadilyDeterminableFairValueAnnualAmount	124055000	USD
CY2019Q4	us-gaap	Equity Securities Without Readily Determinable Fair Value Upward Price Adjustment Cumulative Amount EquitySecuritiesWithoutReadilyDeterminableFairValueUpwardPriceAdjustmentCumulativeAmount	19900000	USD
CY2019Q4	us-gaap	Equity Securities Without Readily Determinable Fair Value Downward Price Adjustment Cumulative Amount EquitySecuritiesWithoutReadilyDeterminableFairValueDownwardPriceAdjustmentCumulativeAmount	7000000.0	USD
CY2019	us-gaap	Equity Securities Fv Ni Realized Gain Loss EquitySecuritiesFvNiRealizedGainLoss	23076000	USD
CY2018	us-gaap	Equity Securities Fv Ni Realized Gain Loss EquitySecuritiesFvNiRealizedGainLoss	27874000	USD
CY2019	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	14505000	USD
CY2018	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	124170000	USD
CY2019	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	37581000	USD
CY2018	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	152044000	USD
CY2018	us-gaap	Equity Method Investment Other Than Temporary Impairment EquityMethodInvestmentOtherThanTemporaryImpairment	600000	USD
CY2017	us-gaap	Equity Method Investment Other Than Temporary Impairment EquityMethodInvestmentOtherThanTemporaryImpairment	2700000	USD
CY2017	us-gaap	Costmethod Investments Other Than Temporary Impairment CostmethodInvestmentsOtherThanTemporaryImpairment	9500000	USD
CY2017Q4	iaci	Proceedsfrom Saleof Cost Method Investment ProceedsfromSaleofCostMethodInvestment	60200000	USD
CY2017Q4	us-gaap	Cost Method Investments Realized Gain Loss CostMethodInvestmentsRealizedGainLoss	9100000	USD
CY2019Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	2550995000	USD
CY2019Q4	us-gaap	Business Combination Contingent Consideration Liability BusinessCombinationContingentConsiderationLiability	6918000	USD
CY2018Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	1818666000	USD
CY2018Q4	us-gaap	Business Combination Contingent Consideration Liability BusinessCombinationContingentConsiderationLiability	28631000	USD
CY2019Q4	us-gaap	Business Combination Contingent Consideration Arrangements Range Of Outcomes Value High BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh	45000000.0	USD
CY2019Q4	iaci	Business Acquisition Contingent Consideration Fair Valueat Balance Sheet Date With A Maximum Limit BusinessAcquisitionContingentConsiderationFairValueatBalanceSheetDateWithAMaximumLimit	12500000	USD
CY2019Q4	us-gaap	Business Combination Contingent Consideration Liability Noncurrent BusinessCombinationContingentConsiderationLiabilityNoncurrent	6900000	USD
CY2018Q4	us-gaap	Business Combination Contingent Consideration Liability Current BusinessCombinationContingentConsiderationLiabilityCurrent	2000000.0	USD
CY2018Q4	us-gaap	Business Combination Contingent Consideration Liability Noncurrent BusinessCombinationContingentConsiderationLiabilityNoncurrent	26600000	USD
CY2018Q4	us-gaap	Debt Instrument Face Amount DebtInstrumentFaceAmount	500000000	USD
CY2019Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	3121572000	USD
CY2018Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	2245548000	USD
CY2019Q4	iaci	Cash And Cash Equivalents And Marketable Securities CashAndCashEquivalentsAndMarketableSecurities	2300000000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	13750000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	13750000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	970000000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	192500000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	400000000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	1950000000	USD
CY2019Q4	us-gaap	Long Term Debt LongTermDebt	3540000000	USD
CY2019Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	13750000	USD
CY2019Q4	us-gaap	Debt Instrument Unamortized Discount Premium Net DebtInstrumentUnamortizedDiscountPremiumNet	357887000	USD
CY2019Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	46791000	USD
CY2019Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	3121572000	USD
CY2019	iaci	Percentage Of Directors Elected By Holders Of Common Stock PercentageOfDirectorsElectedByHoldersOfCommonStock	0.25
CY2019	iaci	Percentage Of Directors Elected By Holders Of Common Stock PercentageOfDirectorsElectedByHoldersOfCommonStock	0.25
CY2019	iaci	Warrants Exercisedduring Period WarrantsExercisedduringPeriod	0	warrant
CY2019	iaci	Exchangeable Notes Exchangedduring Period ExchangeableNotesExchangedduringPeriod	0	exchangeable_note
CY2019Q4	us-gaap	Stock Repurchase Program Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased	8000000.0	shares
CY2019	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-7942000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-7942000	USD
CY2019	iaci	Noncontrolling Interest Reallocationof Interests Attributableto Parent NoncontrollingInterestReallocationofInterestsAttributabletoParent	315000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-25226000	USD
CY2018	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	52000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-25278000	USD
CY2018	iaci	Noncontrolling Interest Reallocationof Interests Attributableto Parent NoncontrollingInterestReallocationofInterestsAttributabletoParent	124000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	65806000	USD
CY2017	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	3360000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	62446000	USD
CY2017	iaci	Noncontrolling Interest Reallocationof Interests Attributableto Parent NoncontrollingInterestReallocationofInterestsAttributabletoParent	109000	USD
CY2017	us-gaap	Reclassification From Aoci Current Period Tax ReclassificationFromAociCurrentPeriodTax	3800000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	543820000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	543820000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	757747000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	757747000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	358008000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	358008000	USD
CY2019	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	112689000	USD
CY2019	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	112689000	USD
CY2018	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	130786000	USD
CY2018	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	130786000	USD
CY2017	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	53084000	USD
CY2017	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	53084000	USD
CY2019	us-gaap	Dilutive Securities DilutiveSecurities	-26063000	USD
CY2018	us-gaap	Dilutive Securities DilutiveSecurities	-25228000	USD
CY2017	us-gaap	Dilutive Securities DilutiveSecurities	-33531000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	431131000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	405068000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	626961000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	601733000	USD
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	304924000	USD
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	271393000	USD
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	84261000	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	84261000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	83407000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	83407000	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	80089000	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	80089000	shares
CY2019	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	5782000	shares
CY2018	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	7915000	shares
CY2017	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	5221000	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	84261000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	90043000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	83407000	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	91322000	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	80089000	shares
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	85310000	shares
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	5.12
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.50
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	7.52
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	6.59
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.81
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.18
CY2017	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	100000	shares
CY2019	iaci	Average Stock Priceduring Period AverageStockPriceduringPeriod	223.89
CY2018	iaci	Average Stock Priceduring Period AverageStockPriceduringPeriod	167.61
CY2017	iaci	Average Stock Priceduring Period AverageStockPriceduringPeriod	100.54
CY2019	iaci	Share Based Compensation Arrangement By Share Based Payment Award Number Of Active Plans ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfActivePlans	2	plan
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	12600000	shares
CY2019Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	272600000	USD
CY2019	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P2Y3M18D
CY2018Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	5814000	shares
CY2018Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	62.97
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	0	shares
CY2019	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	0
CY2019	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	911000	shares
CY2019	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	53.41
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	15000	shares
CY2019	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	101.01
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod	1000	shares
CY2019	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice	124.29
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	4887000	shares
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	64.63
CY2019	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P5Y3M18D
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	901629000	USD
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	3851000	shares
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	62.83
CY2019	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1	P4Y10M24D
CY2019Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	717388000	USD
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	167400000	USD
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	83700000	USD
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	164600000	USD
CY2019Q4	us-gaap	Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Number Of Outstanding Options ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions	4887000	shares
CY2019	us-gaap	Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Outstanding Options Weighted Average Remaining Contractual Term2 SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageRemainingContractualTerm2	P5Y3M18D
CY2019Q4	us-gaap	Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Outstanding Options Weighted Average Exercise Price Beginning Balance1 SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1	64.63
CY2019Q4	us-gaap	Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Number Of Exercisable Options ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions	3851000	shares
CY2019	us-gaap	Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Exercisable Options Weighted Average Remaining Contractual Term2 SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageRemainingContractualTerm2	P4Y10M24D
CY2019Q4	us-gaap	Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Exercisable Options Weighted Average Exercise Price1 SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1	62.83
CY2018Q4	iaci	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value With Exercise Price Equal To Market Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValueWithExercisePriceEqualToMarketPrice	53.94
CY2017Q4	iaci	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value With Exercise Price Equal To Market Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValueWithExercisePriceEqualToMarketPrice	22.94
CY2019	iaci	Sharebased Compensation Arrangementby Sharebased Payment Award Numberof Shares Requiredto Settle Vestedand Unvested Interestsatfair Value SharebasedCompensationArrangementbySharebasedPaymentAwardNumberofSharesRequiredtoSettleVestedandUnvestedInterestsatfairValue	100000	shares
CY2019	iaci	Sharebased Compensation Arrangementby Sharebased Payment Award Cash Requiredto Settle Vestedand Unvested Interestsatfair Value SharebasedCompensationArrangementbySharebasedPaymentAwardCashRequiredtoSettleVestedandUnvestedInterestsatfairValue	20200000	USD
CY2019	iaci	Sharebased Compensation Arrangementby Sharebased Payment Award Percentageof Withholding Rate SharebasedCompensationArrangementbySharebasedPaymentAwardPercentageofWithholdingRate	0.50
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Plan Modification Incremental Compensation Cost ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost	6600000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	4757055000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	4262892000	USD
CY2017	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	3307239000	USD
CY2019	us-gaap	Revenues Revenues	4757055000	USD
CY2018	us-gaap	Revenues Revenues	4262892000	USD
CY2017	us-gaap	Revenues Revenues	3307239000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	371353000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	318800000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	581333000	USD
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	565139000	USD
CY2017	us-gaap	Operating Income Loss OperatingIncomeLoss	188466000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	581333000	USD
CY2019	us-gaap	Interest Expense InterestExpense	153563000	USD
CY2019	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	66741000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	494511000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-49309000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	543820000	USD
CY2019	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	112689000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	431131000	USD
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	565139000	USD
CY2018	us-gaap	Interest Expense InterestExpense	109327000	USD
CY2018	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	305746000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	761558000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3811000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	757747000	USD
CY2018	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	130786000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	626961000	USD
CY2017	us-gaap	Operating Income Loss OperatingIncomeLoss	188466000	USD
CY2017	us-gaap	Interest Expense InterestExpense	105295000	USD
CY2017	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-16213000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	66958000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-291050000	USD
CY2017	us-gaap	Profit Loss ProfitLoss	358008000	USD
CY2017	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	53084000	USD
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	304924000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	136652000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	85634000	USD
CY2017	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	75523000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	167801000	USD
CY2019Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	33118000	USD
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	190772000	USD
CY2019Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	223890000	USD
CY2019	us-gaap	Operating Lease Cost OperatingLeaseCost	50927000	USD
CY2019	us-gaap	Variable Lease Cost VariableLeaseCost	10258000	USD
CY2019	us-gaap	Lease Cost LeaseCost	61185000	USD
CY2019	us-gaap	Short Term Lease Cost ShortTermLeaseCost	5300000	USD
CY2019	us-gaap	Sublease Income SubleaseIncome	2100000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	43902000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	40567000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	32135000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	28607000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	25594000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	226734000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	397539000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	173649000	USD
CY2019Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	223890000	USD
CY2019Q4	iaci	Lessee Operating Lease Lease Notyet Commenced Amount LesseeOperatingLeaseLeaseNotyetCommencedAmount	37700000	USD
CY2019Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P15Y4M24D
CY2019Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0600
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	66408000	USD
CY2019	us-gaap	Operating Lease Payments OperatingLeasePayments	49117000	USD
CY2019Q4	us-gaap	Loss Contingency Accrual At Carrying Value LossContingencyAccrualAtCarryingValue	0	USD
CY2019	us-gaap	Defined Contribution Plan Maximum Annual Contributions Per Employee Percent DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent	0.50
	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent DefinedContributionPlanEmployerMatchingContributionPercent	0.03
	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent Of Match DefinedContributionPlanEmployerMatchingContributionPercentOfMatch	1
	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent DefinedContributionPlanEmployerMatchingContributionPercent	0.10
CY2019Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	97609000	USD
CY2018Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	55586000	USD
CY2019Q4	us-gaap	Contract With Customer Asset Net Current ContractWithCustomerAssetNetCurrent	71548000	USD
CY2018Q4	us-gaap	Contract With Customer Asset Net Current ContractWithCustomerAssetNetCurrent	69817000	USD
CY2019Q4	iaci	Capitalize Access Fees Current CapitalizeAccessFeesCurrent	21985000	USD
CY2018Q4	iaci	Capitalize Access Fees Current CapitalizeAccessFeesCurrent	33365000	USD
CY2019Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	9308000	USD
CY2018Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	10132000	USD
CY2019Q4	us-gaap	Other Assets Miscellaneous Current OtherAssetsMiscellaneousCurrent	48917000	USD
CY2018Q4	us-gaap	Other Assets Miscellaneous Current OtherAssetsMiscellaneousCurrent	59353000	USD
CY2019Q4	us-gaap	Other Assets Current OtherAssetsCurrent	249367000	USD
CY2018Q4	us-gaap	Other Assets Current OtherAssetsCurrent	228253000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	695712000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	605598000	USD
CY2019Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	324359000	USD
CY2018Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	286798000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	371353000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	318800000	USD
CY2019Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	153705000	USD
CY2018Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	137583000	USD
CY2019Q4	us-gaap	Accrued Advertising Current AccruedAdvertisingCurrent	91470000	USD
CY2018Q4	us-gaap	Accrued Advertising Current AccruedAdvertisingCurrent	105520000	USD
CY2019Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	256828000	USD
CY2018Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	191783000	USD
CY2019Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	502003000	USD
CY2018Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	434886000	USD
CY2019	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	66741000	USD
CY2018	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	305746000	USD
CY2017	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-16213000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	3139295000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	2131632000	USD
CY2017Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1630809000	USD
CY2016Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1329187000	USD
CY2019Q4	us-gaap	Restricted Cash Current RestrictedCashCurrent	654000	USD
CY2018Q4	us-gaap	Restricted Cash Current RestrictedCashCurrent	1633000	USD
CY2017Q4	us-gaap	Restricted Cash Current RestrictedCashCurrent	2873000	USD
CY2016Q4	us-gaap	Restricted Cash Current RestrictedCashCurrent	20464000	USD
CY2019Q4	us-gaap	Restricted Cash Noncurrent RestrictedCashNoncurrent	409000	USD
CY2018Q4	us-gaap	Restricted Cash Noncurrent RestrictedCashNoncurrent	420000	USD
CY2017Q4	us-gaap	Restricted Cash Noncurrent RestrictedCashNoncurrent	0	USD
CY2016Q4	us-gaap	Restricted Cash Noncurrent RestrictedCashNoncurrent	10548000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	3140358000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	2133685000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1633682000	USD
CY2016Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1360199000	USD
CY2018	iaci	Fair Value Of Contingent Consideration At Date Of Acquisition FairValueOfContingentConsiderationAtDateOfAcquisition	25500000	USD
CY2019	iaci	Fair Value Of Contingent Consideration At Date Of Acquisition FairValueOfContingentConsiderationAtDateOfAcquisition	0	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	96730000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	90485000	USD
CY2017	us-gaap	Interest Paid Net InterestPaidNet	92461000	USD
CY2019	us-gaap	Income Taxes Paid IncomeTaxesPaid	39515000	USD
CY2018	us-gaap	Income Taxes Paid IncomeTaxesPaid	45154000	USD
CY2017	us-gaap	Income Taxes Paid IncomeTaxesPaid	35598000	USD
CY2019	us-gaap	Proceeds From Income Tax Refunds ProceedsFromIncomeTaxRefunds	5436000	USD
CY2018	us-gaap	Proceeds From Income Tax Refunds ProceedsFromIncomeTaxRefunds	33698000	USD
CY2017	us-gaap	Proceeds From Income Tax Refunds ProceedsFromIncomeTaxRefunds	42025000	USD
CY2019Q1	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1105843000	USD
CY2019Q2	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1186658000	USD
CY2019Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1246874000	USD
CY2019Q4	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1217680000	USD
CY2019Q1	us-gaap	Cost Of Revenue CostOfRevenue	260071000	USD
CY2019Q2	us-gaap	Cost Of Revenue CostOfRevenue	276389000	USD
CY2019Q3	us-gaap	Cost Of Revenue CostOfRevenue	296385000	USD
CY2019Q4	us-gaap	Cost Of Revenue CostOfRevenue	294575000	USD
CY2019Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	79873000	USD
CY2019Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	154310000	USD
CY2019Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	185852000	USD
CY2019Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	161298000	USD
CY2019Q1	us-gaap	Profit Loss ProfitLoss	112985000	USD
CY2019Q2	us-gaap	Profit Loss ProfitLoss	146791000	USD
CY2019Q3	us-gaap	Profit Loss ProfitLoss	159772000	USD
CY2019Q4	us-gaap	Profit Loss ProfitLoss	124272000	USD
CY2019Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	88695000	USD
CY2019Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	113467000	USD
CY2019Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	128544000	USD
CY2019Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	100425000	USD
CY2019Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.06
CY2019Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.35
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.52
CY2019Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.19
CY2019Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.91
CY2019Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.19
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.35
CY2019Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.05
CY2018Q1	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	995075000	USD
CY2018Q2	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1059122000	USD
CY2018Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1104592000	USD
CY2018Q4	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1104103000	USD
CY2018Q1	us-gaap	Cost Of Revenue CostOfRevenue	201962000	USD
CY2018Q2	us-gaap	Cost Of Revenue CostOfRevenue	218224000	USD
CY2018Q3	us-gaap	Cost Of Revenue CostOfRevenue	237238000	USD
CY2018Q4	us-gaap	Cost Of Revenue CostOfRevenue	253722000	USD
CY2018Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	89950000	USD
CY2018Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	168437000	USD
CY2018Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	172832000	USD
CY2018Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	133920000	USD
CY2018Q1	us-gaap	Profit Loss ProfitLoss	87839000	USD
CY2018Q2	us-gaap	Profit Loss ProfitLoss	280854000	USD
CY2018Q3	us-gaap	Profit Loss ProfitLoss	171577000	USD
CY2018Q4	us-gaap	Profit Loss ProfitLoss	217477000	USD
CY2018Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	71082000	USD
CY2018Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	218353000	USD
CY2018Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	145774000	USD
CY2018Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	191752000	USD
CY2018Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.86
CY2018Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.61
CY2018Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.75
CY2018Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.29
CY2018Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.71
CY2018Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.32
CY2018Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.49
CY2018Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.04
CY2018Q4	iaci	Impairmentof Intangible Assets Indefinitelived Excluding Goodwill Netof Tax ImpairmentofIntangibleAssetsIndefinitelivedExcludingGoodwillNetofTax	21300000	USD

Files In Submission

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$MTCH
Match Group, Inc. Stock $mtch

2019 Q4 Form 10-K Financial Statement

#000089110320000004 Filed on February 28, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$MTCH Match Group, Inc. Stock $mtch

2019 Q4 Form 10-K Financial Statement

#000089110320000004 Filed on February 28, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$MTCH
Match Group, Inc. Stock $mtch