$IAC
IAC Inc. Stock $iac

$iac Overview Financials Valuation SEC Filings Company Website

2020 Q4 Form 8-K Financial Statement

#000180022721000014 Filed on June 01, 2021

Income Statement

Concept	2020 Q4	2020 Q3	2020 Q2
Revenue	$765.0M	$713.2M	$659.0M
YoY Change	24.2%	9.18%	2.49%
Cost Of Revenue	$224.3M	$184.9M	$155.8M
YoY Change	65.78%	32.27%	16.56%
Gross Profit	$540.8M	$528.4M	$503.2M
YoY Change	12.5%	2.89%	-1.21%
Gross Profit Margin	70.68%	74.08%	76.35%
Selling, General & Admin	$521.0M	$473.5M	$514.4M
YoY Change	18.06%	6.22%	8.37%
% of Gross Profit	96.35%	89.62%	102.23%
Research & Development	$75.20M	$51.73M	$46.34M
YoY Change	41.62%	3.47%	0.88%
% of Gross Profit	13.91%	9.79%	9.21%
Depreciation & Amortization	$27.90M	$78.80M	$42.90M
YoY Change	-23.98%	110.13%	33.23%
% of Gross Profit	5.16%	14.91%	8.53%
Operating Expenses	$624.1M	$525.2M	$560.7M
YoY Change	17.51%	5.95%	7.71%
Operating Profit	-$22.10M	-$122.2M	-$97.45M
YoY Change	374.57%	-557.68%	8523.45%
Interest Expense	$578.2M	$5.807M	$1.555M
YoY Change	-96.18%	100.38%	-51.96%
% of Operating Profit
Other Income/Expense, Net	$1.500M	$1.602M	$3.311M
YoY Change	-100.01%	-113.67%	-90.26%
Pretax Income	$555.4M	$162.7M	-$120.4M
YoY Change	-32770.59%	-23304.42%	-809.32%
Income Tax	$48.00M	-$25.06M	-$34.40M
% Of Pretax Income	8.64%	-15.41%
Net Earnings	$509.1M	$184.9M	-$96.12M
YoY Change	7292.55%	1023.02%	-797.06%
Net Earnings / Revenue	66.55%	25.93%	-14.58%
Basic Earnings Per Share	$5.96	$2.17	-$1.13
Diluted Earnings Per Share	$5.59	$2.04	-$1.13
COMMON SHARES
Basic Shares Outstanding		85.30M shares	85.13M shares
Diluted Shares Outstanding		90.48M shares	85.13M shares

Balance Sheet

Concept	2020 Q4	2020 Q3	2020 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments	$3.591B	$3.809B	$2.914B
YoY Change	328.58%	22.76%	-12.07%
Cash & Equivalents	$3.366B	$3.459B	$2.445B
Short-Term Investments	$225.0M	$350.0M	$469.0M
Other Short-Term Assets	$140.0M	$156.5M	$146.3M
YoY Change	-4.14%	-30.45%	-37.75%
Inventory	$317.0K
Prepaid Expenses	$46.10M
Receivables	$257.7M	$227.3M	$205.4M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$4.119B	$4.205B	$3.288B
YoY Change	235.11%	14.16%	-15.99%
LONG-TERM ASSETS
Property, Plant & Equipment	$274.9M	$265.8M	$269.2M
YoY Change	-9.09%	-50.68%	-50.33%
Goodwill	$1.660B	$1.768B	$1.819B
YoY Change	18.79%
Intangibles	$395.0M	$394.4M	$428.5M
YoY Change	21.7%
Long-Term Investments	$1.152M	$1.580B	$296.0M
YoY Change		373.05%	190.2%
Other Assets	$288.0M	$266.2M	$270.4M
YoY Change	18.79%	-8.21%	22.9%
Total Long-Term Assets	$5.042B	$4.275B	$3.083B
YoY Change	74.64%	-7.49%	-29.68%
TOTAL ASSETS
Total Short-Term Assets	$4.119B	$4.205B	$3.288B
Total Long-Term Assets	$5.042B	$4.275B	$3.083B
Total Assets	$9.162B	$8.480B	$6.372B
YoY Change	122.56%	2.11%	-23.22%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$92.00M	$96.00M	$99.00M
YoY Change	27.78%	-4.95%	-4.81%
Accrued Expenses	$340.4M	$402.2M	$348.9M
YoY Change	20.37%	-20.67%	-19.42%
Deferred Revenue	$137.7M	$268.2M	$242.8M
YoY Change	45.41%
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$0.00	$13.75M	$13.75M
YoY Change	-100.0%	-1.79%	-1.79%
Total Short-Term Liabilities	$750.9M	$780.2M	$704.6M
YoY Change	28.29%	-24.69%	-26.07%
LONG-TERM LIABILITIES
Long-Term Debt	$712.3M	$715.4M	$225.3M
YoY Change	207.09%	-77.01%	-92.82%
Other Long-Term Liabilities	$233.9M	$192.3M	$187.0M
YoY Change	32.67%	-23.69%	-28.09%
Total Long-Term Liabilities	$946.1M	$907.7M	$412.3M
YoY Change	131.78%	-73.02%	-87.87%
TOTAL LIABILITIES
Total Short-Term Liabilities	$750.9M	$780.2M	$704.6M
Total Long-Term Liabilities	$946.1M	$907.7M	$412.3M
Total Liabilities	$1.697B	$1.688B	$1.117B
YoY Change	70.81%	-68.79%	-78.99%
SHAREHOLDERS EQUITY
Retained Earnings	$694.0M	$184.9M
YoY Change
Common Stock	$5.910B	$6.021B	$4.661B
YoY Change
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$6.598B	$6.194B	$4.648B
YoY Change
Total Liabilities & Shareholders Equity	$9.162B	$8.480B	$6.372B
YoY Change	122.56%	2.11%	-23.22%

Cashflow Statement

Concept	2020 Q4	2020 Q3	2020 Q2
OPERATING ACTIVITIES
Net Income	$509.1M	$184.9M	-$96.12M
YoY Change	7292.55%	1023.02%	-797.06%
Depreciation, Depletion And Amortization	$27.90M	$78.80M	$42.90M
YoY Change	-23.98%	110.13%	33.23%
Cash From Operating Activities	-$13.40M	$93.10M	$35.70M
YoY Change	-122.19%	12.17%	-66.26%
INVESTING ACTIVITIES
Capital Expenditures	-$19.90M	-$14.30M	-$12.60M
YoY Change	-18.11%	-19.21%	-68.5%
Acquisitions
YoY Change
Other Investing Activities	-$24.00M	-$880.4M	-$402.4M
YoY Change	-118.24%	203.8%	114.73%
Cash From Investing Activities	-$43.80M	-$894.7M	-$415.0M
YoY Change	-140.82%	190.96%	82.5%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	47.00M	1.837B	796.2M
YoY Change	-411.26%	678.68%	-2527.44%
NET CHANGE
Cash From Operating Activities	-13.40M	93.10M	35.70M
Cash From Investing Activities	-43.80M	-894.7M	-415.0M
Cash From Financing Activities	47.00M	1.837B	796.2M
Net Change In Cash	-10.20M	1.035B	416.9M
YoY Change	-106.68%	8981.58%	-370.01%
FREE CASH FLOW
Cash From Operating Activities	-$13.40M	$93.10M	$35.70M
Capital Expenditures	-$19.90M	-$14.30M	-$12.60M
Free Cash Flow	$6.500M	$107.4M	$48.30M
YoY Change	-92.33%	6.65%	-66.87%

Facts In Submission

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CY2021Q2	dei	Document Period End Date DocumentPeriodEndDate	2021-06-01
CY2021Q2	dei	Entity Registrant Name EntityRegistrantName	IAC/INTERACTIVECORP
CY2021Q2	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
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CY2019	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.84
CY2018	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	3.24
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.16
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.27
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.90
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.97
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.27
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.90
CY2020	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	188995000	USD
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	130228000	USD
CY2018	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	144599000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	268586000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	32183000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	292371000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	7810000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	311000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-6444000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	2000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-3000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	3000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	7812000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	308000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-6441000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	276398000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	32491000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	285930000	USD
CY2020	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-1140000	USD
CY2019	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	9288000	USD
CY2018	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	45599000	USD
CY2020	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest	1718000	USD
CY2019	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest	-26000	USD
CY2018	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest	-1416000	USD
CY2020	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest	0	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
CY2020	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	578000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	9261000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	44184000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	275820000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	23230000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	241746000	USD
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	3005146000	USD
CY2020	us-gaap	Net Income Loss Including Portion Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest	270020000	USD
CY2020	iaci	Other Comprehensive Income Loss Netof Tax Including Portion Attributableto Nonredeemable Noncontrolling Interest Total OtherComprehensiveIncomeLossNetofTaxIncludingPortionAttributabletoNonredeemableNoncontrollingInterestTotal	7373000	USD
CY2020	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	199028000	USD
CY2020	us-gaap	Minority Interest Decrease From Redemptions MinorityInterestDecreaseFromRedemptions	1115000	USD
CY2020	iaci	Issuanceof Common Stock Pursuantto Stock Based Awards Netof Withholding Taxes IssuanceofCommonStockPursuanttoStockBasedAwardsNetofWithholdingTaxes	-64142000	USD
CY2020	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	64132000	USD
CY2020	iaci	Net Increase Decreasein Parent Investmentin Holdings Company NetIncreaseDecreaseinParentInvestmentinHoldingsCompany	1685995000	USD
CY2020	iaci	Cash Merger Consideration Paid CashMergerConsiderationPaid	837913000	USD
CY2020	iaci	Capitalizationasa Resultofthe Separation Amount CapitalizationasaResultoftheSeparationAmount	0	USD
CY2020	iaci	Adjustmentof Redeemable Noncontrolling Interestto Fair Value AdjustmentofRedeemableNoncontrollingInteresttoFairValue	183315000	USD
CY2020	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	-83382000	USD
CY2020	us-gaap	Stock Issued During Period Value Restricted Stock Award Gross StockIssuedDuringPeriodValueRestrictedStockAwardGross	0	USD
CY2020	iaci	Adjustment To Additional Paid In Capital Capitalization Of Tax Accounts As A Result Of The Separation AdjustmentToAdditionalPaidInCapitalCapitalizationOfTaxAccountsAsAResultOfTheSeparation	-8259000	USD
CY2020	us-gaap	Stockholders Equity Other StockholdersEquityOther	-199000	USD
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	7150928000	USD
CY2017Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2256320000	USD
CY2018	us-gaap	Net Income Loss Including Portion Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest	258583000	USD
CY2018	iaci	Other Comprehensive Income Loss Netof Tax Including Portion Attributableto Nonredeemable Noncontrolling Interest Total OtherComprehensiveIncomeLossNetofTaxIncludingPortionAttributabletoNonredeemableNoncontrollingInterestTotal	-5859000	USD
CY2018	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	147267000	USD
CY2018	us-gaap	Minority Interest Decrease From Redemptions MinorityInterestDecreaseFromRedemptions	1236000	USD
CY2018	iaci	Adjustmentof Redeemable Noncontrolling Interestto Fair Value AdjustmentofRedeemableNoncontrollingInteresttoFairValue	6640000	USD
CY2018	iaci	Issuanceof Common Stock Pursuantto Stock Based Awards Netof Withholding Taxes IssuanceofCommonStockPursuanttoStockBasedAwardsNetofWithholdingTaxes	140706000	USD
CY2018	iaci	Net Increase Decreasein Parent Investmentin Holdings Company NetIncreaseDecreaseinParentInvestmentinHoldingsCompany	-145461000	USD
CY2018	us-gaap	Stockholders Equity Other StockholdersEquityOther	-383000	USD
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2684400000	USD
CY2019	us-gaap	Net Income Loss Including Portion Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest	29015000	USD
CY2019	iaci	Other Comprehensive Income Loss Netof Tax Including Portion Attributableto Nonredeemable Noncontrolling Interest Total OtherComprehensiveIncomeLossNetofTaxIncludingPortionAttributabletoNonredeemableNoncontrollingInterestTotal	269000	USD
CY2019	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	131708000	USD
CY2019	iaci	Adjustmentof Redeemable Noncontrolling Interestto Fair Value AdjustmentofRedeemableNoncontrollingInteresttoFairValue	11554000	USD
CY2019	iaci	Issuanceof Common Stock Pursuantto Stock Based Awards Netof Withholding Taxes IssuanceofCommonStockPursuanttoStockBasedAwardsNetofWithholdingTaxes	-34722000	USD
CY2019	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	57949000	USD
CY2019	iaci	Net Increase Decreasein Parent Investmentin Holdings Company NetIncreaseDecreaseinParentInvestmentinHoldingsCompany	263979000	USD
CY2019	us-gaap	Stockholders Equity Other StockholdersEquityOther	0	USD
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	3005146000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	268586000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	32183000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	292371000	USD
CY2020	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	-21281000	USD
CY2019	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	-49483000	USD
CY2018	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	-29959000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	289867000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	81666000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	322330000	USD
CY2020	us-gaap	Share Based Compensation ShareBasedCompensation	188995000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	130228000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	144599000	USD
CY2020	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	126839000	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	74215000	USD
CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	100732000	USD
CY2020	us-gaap	Depreciation Depreciation	68823000	USD
CY2019	us-gaap	Depreciation Depreciation	55471000	USD
CY2018	us-gaap	Depreciation Depreciation	41193000	USD
CY2020	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	78931000	USD
CY2019	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	64478000	USD
CY2018	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	47718000	USD
CY2020	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	265146000	USD
CY2019	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	3318000	USD
CY2018	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-18356000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-49374000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	18563000	USD
CY2020	us-gaap	Unrealized Gain Loss On Investments UnrealizedGainLossOnInvestments	840550000	USD
CY2019	us-gaap	Unrealized Gain Loss On Investments UnrealizedGainLossOnInvestments	0	USD
CY2018	us-gaap	Unrealized Gain Loss On Investments UnrealizedGainLossOnInvestments	0	USD
CY2020	iaci	Long Term Equity Securities Fvni Realized Gain Loss LongTermEquitySecuritiesFVNIRealizedGainLoss	-41112000	USD
CY2019	iaci	Long Term Equity Securities Fvni Realized Gain Loss LongTermEquitySecuritiesFVNIRealizedGainLoss	39388000	USD
CY2018	iaci	Long Term Equity Securities Fvni Realized Gain Loss LongTermEquitySecuritiesFVNIRealizedGainLoss	153429000	USD
CY2020	iaci	Gain Losson Dispositionof Businessand Investments GainLossonDispositionofBusinessandInvestments	1061000	USD
CY2019	iaci	Gain Losson Dispositionof Businessand Investments GainLossonDispositionofBusinessandInvestments	-6000	USD
CY2018	iaci	Gain Losson Dispositionof Businessand Investments GainLossonDispositionofBusinessandInvestments	121312000	USD
CY2020	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-26204000	USD
CY2019	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-4004000	USD
CY2018	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-2390000	USD
CY2020	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	131703000	USD
CY2019	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	72109000	USD
CY2018	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	47382000	USD
CY2020	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	547000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-11913000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	26590000	USD
CY2020	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	6119000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	52000	USD
CY2018	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	25720000	USD
CY2020	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	-11580000	USD
CY2019	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	4000	USD
CY2018	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	3981000	USD
CY2020	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	25140000	USD
CY2019	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	10851000	USD
CY2018	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	18478000	USD
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	113379000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	275335000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	376991000	USD
CY2020	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	685216000	USD
CY2019	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	28439000	USD
CY2018	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	65402000	USD
CY2020	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	60726000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	95097000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	54471000	USD
CY2020	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	475000000	USD
CY2019	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	25000000	USD
CY2018	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	35000000	USD
CY2020	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	649828000	USD
CY2018	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	59671000	USD
CY2020	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	26055000	USD
CY2019	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	166440000	USD
CY2018	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	136311000	USD
CY2020	us-gaap	Payments To Acquire Longterm Investments PaymentsToAcquireLongtermInvestments	1152000	USD
CY2019	us-gaap	Payments To Acquire Longterm Investments PaymentsToAcquireLongtermInvestments	253663000	USD
CY2018	us-gaap	Payments To Acquire Longterm Investments PaymentsToAcquireLongtermInvestments	49180000	USD
CY2020	us-gaap	Proceeds From Payments For Long Term Loans For Related Parties ProceedsFromPaymentsForLongTermLoansForRelatedParties	54828000	USD
CY2019	us-gaap	Proceeds From Payments For Long Term Loans For Related Parties ProceedsFromPaymentsForLongTermLoansForRelatedParties	-54828000	USD
CY2018	us-gaap	Proceeds From Payments For Long Term Loans For Related Parties ProceedsFromPaymentsForLongTermLoansForRelatedParties	0	USD
CY2020	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	11536000	USD
CY2019	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	9086000	USD
CY2018	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-13170000	USD
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-1872183000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-249673000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-44243000	USD
CY2020	us-gaap	Proceeds From Related Party Debt ProceedsFromRelatedPartyDebt	0	USD
CY2019	us-gaap	Proceeds From Related Party Debt ProceedsFromRelatedPartyDebt	0	USD
CY2018	us-gaap	Proceeds From Related Party Debt ProceedsFromRelatedPartyDebt	2500000	USD
CY2020	us-gaap	Repayments Of Related Party Debt RepaymentsOfRelatedPartyDebt	0	USD
CY2019	us-gaap	Repayments Of Related Party Debt RepaymentsOfRelatedPartyDebt	2500000	USD
CY2018	us-gaap	Repayments Of Related Party Debt RepaymentsOfRelatedPartyDebt	0	USD
CY2020	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	6484000	USD
CY2019	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	0	USD
CY2018	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	3709000	USD
CY2020	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	4280000	USD
CY2019	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	24595000	USD
CY2018	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	12496000	USD
CY2020	iaci	Cash Merger Consideration Receivedfor Separation CashMergerConsiderationReceivedforSeparation	837913000	USD
CY2019	iaci	Cash Merger Consideration Receivedfor Separation CashMergerConsiderationReceivedforSeparation	0	USD
CY2018	iaci	Cash Merger Consideration Receivedfor Separation CashMergerConsiderationReceivedforSeparation	0	USD
CY2020	iaci	Transfers From To Parent Company TransfersFromToParentCompany	1706479000	USD
CY2019	iaci	Transfers From To Parent Company TransfersFromToParentCompany	263281000	USD
CY2018	iaci	Transfers From To Parent Company TransfersFromToParentCompany	-144069000	USD
CY2020	iaci	Proceeds From The Issuance Of Common Stock Of Parent Company ProceedsFromTheIssuanceOfCommonStockOfParentCompany	1408298000	USD
CY2019	iaci	Proceeds From The Issuance Of Common Stock Of Parent Company ProceedsFromTheIssuanceOfCommonStockOfParentCompany	0	USD
CY2018	iaci	Proceeds From The Issuance Of Common Stock Of Parent Company ProceedsFromTheIssuanceOfCommonStockOfParentCompany	0	USD
CY2020	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	1095000	USD
CY2019	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-3795000	USD
CY2018	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-1041000	USD
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	4202665000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	127025000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	-197716000	USD
CY2020	us-gaap	Net Cash Provided By Used In Continuing Operations NetCashProvidedByUsedInContinuingOperations	2443861000	USD
CY2019	us-gaap	Net Cash Provided By Used In Continuing Operations NetCashProvidedByUsedInContinuingOperations	152687000	USD
CY2018	us-gaap	Net Cash Provided By Used In Continuing Operations NetCashProvidedByUsedInContinuingOperations	135032000	USD
CY2020	us-gaap	Cash Provided By Used In Operating Activities Discontinued Operations CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations	41202000	USD
CY2019	us-gaap	Cash Provided By Used In Operating Activities Discontinued Operations CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations	-23535000	USD
CY2018	us-gaap	Cash Provided By Used In Operating Activities Discontinued Operations CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations	-7556000	USD
CY2020	us-gaap	Cash Provided By Used In Investing Activities Discontinued Operations CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations	42000	USD
CY2019	us-gaap	Cash Provided By Used In Investing Activities Discontinued Operations CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations	-172195000	USD
CY2018	us-gaap	Cash Provided By Used In Investing Activities Discontinued Operations CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations	-439000	USD
CY2020	us-gaap	Cash Provided By Used In Financing Activities Discontinued Operations CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations	149254000	USD
CY2019	us-gaap	Cash Provided By Used In Financing Activities Discontinued Operations CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations	-2939000	USD
CY2018	us-gaap	Cash Provided By Used In Financing Activities Discontinued Operations CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations	-22000	USD
CY2020	us-gaap	Net Cash Provided By Used In Discontinued Operations NetCashProvidedByUsedInDiscontinuedOperations	190498000	USD
CY2019	us-gaap	Net Cash Provided By Used In Discontinued Operations NetCashProvidedByUsedInDiscontinuedOperations	-198669000	USD
CY2018	us-gaap	Net Cash Provided By Used In Discontinued Operations NetCashProvidedByUsedInDiscontinuedOperations	-8017000	USD
CY2020	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	2019000	USD
CY2019	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	-122000	USD
CY2018	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	-118000	USD
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	2636378000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-46104000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	126897000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	840732000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	886836000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	759939000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	3477110000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	840732000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	886836000	USD
CY2020	us-gaap	Nature Of Operations NatureOfOperations	ORGANIZATION<div style="margin-bottom:12pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">MTCH Separation:</span></div><div style="margin-bottom:12pt;text-indent:22.5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">On December 19, 2019, IAC/InterActiveCorp ("Old IAC") entered into a Transaction Agreement (as amended as of April 28, 2020 and June 22, 2020, the "Transaction Agreement") with Match Group, Inc. ("Old MTCH"), IAC Holdings, Inc. ("New IAC" or the "Company"), a direct wholly owned subsidiary of Old IAC, and Valentine Merger Sub LLC, an indirect wholly owned subsidiary of Old IAC. On June 30, 2020, the businesses of Old MTCH were separated from the remaining businesses of Old IAC through a series of transactions that resulted in the pre-transaction stockholders of Old IAC owning shares in two, separate public companies—(1) Old IAC, which was renamed Match Group, Inc. ("New Match") and which owns the businesses of Old MTCH and certain Old IAC financing subsidiaries, and (2) New IAC, which was renamed IAC/InterActiveCorp, and which owns Old IAC's other businesses—and the pre-transaction stockholders of Old MTCH (other than Old IAC) owning shares in New Match. This transaction is referred to as the "MTCH Separation".</span></div><div style="margin-bottom:12pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Spin-off:</span></div><div style="margin-bottom:12pt;text-indent:22.5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">On May 25</span><span style="background-color:#ffffff;color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">, 2</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">021, IAC completed the previously announced spin-off of its full stake in Vimeo to IAC shareholders. IAC's Vimeo business was separated from the remaining businesses of IAC through a series of transactions (which we refer to as the “Spin-off”). Following the Spin-off, Vimeo, Inc. (formerly Vimeo Holdings, Inc. ("SpinCo")) became an independent, separately traded public company. Therefore, Vimeo is presented as discontinued operations within IAC's consolidated and combined financial statements for all periods prior to May 25</span><span style="background-color:#ffffff;color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">, 2</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">021 in accordance with ASC 205, </span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:400;line-height:120%">Presentation of Financial Statements</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">. </span></div><div style="margin-bottom:12pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:107%">Company overview</span></div><div style="margin-bottom:12pt;text-indent:22.5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The Company operates Dotdash and Care.com, among many other online businesses, and has majority ownership of Angi Inc. (formerly ANGI Homeservices), which operates HomeAdvisor, Angi (formerly Angie’s List) and Handy.</span></div><div style="margin-bottom:12pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Angi Inc. </span></div><div style="margin-bottom:12pt;text-indent:22.5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Our Angi Inc. segment includes the North American (United States and Canada) and European businesses and operations of Angi Inc. On September 29, 2017, the Company's HomeAdvisor business and Angie's List Inc. combined under a new publicly traded company called Angi Inc. (the "Combination"). At December 31, 2020, IAC’s economic interest and voting interest in Angi Inc. were 84.3% and 98.2%, respectively.</span></div><div style="margin-bottom:12pt;text-indent:22.5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Angi Inc. connects quality home service professionals across 500 different categories, from repairing and remodeling to cleaning and landscaping, with consumers. Over 240,000 domestic service professionals actively sought consumer matches, completed jobs or advertised work through Angi Inc. platforms and consumers turn to at least one of our brands to find a professional for approximately 32 million projects during the year ended December 31, 2020. Angi Inc. has established category-transforming products with brands such as HomeAdvisor, Angi and Handy.</span></div><div style="margin-bottom:12pt;text-indent:22.5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Angi Inc.'s Handy business is 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 Inc. 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 Inc. also operated Felix, a pay-per-call advertising service business. In addition to its market-leading U.S. operations, Angi Inc. owns leading home services online marketplaces in France (Travaux), Germany (MyHammer), Netherlands (Werkspot), United Kingdom (MyBuilder Limited or "MyBuilder," which we acquired a 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="margin-bottom:12pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Dotdash</span></div><div style="margin-bottom:12pt;text-indent:22.5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Dotdash is a portfolio of digital publishing brands that collectively provide expert information and inspiration in select vertical content categories. Through our brands, Dotdash provides original and engaging digital content in a variety of formats, including articles, illustrations, videos and images.</span></div><div style="margin-bottom:12pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Search</span></div><div style="margin-bottom:12pt;text-indent:22.5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The Search segment consists of Ask Media Group and the Desktop business. Ask Media Group is a collection of websites providing general search services, and to a lesser extent, content that help users find the information they need. Through the Desktop business, we are a leading provider of global, advertising-driven desktop applications. 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="margin-bottom:12pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Emerging & Other</span></div><div style="margin-bottom:12pt;text-indent:22.5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Our Emerging & Other segment primarily includes:</span></div><div style="margin-bottom:12pt;padding-left:36pt;text-indent:-18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">•</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%;padding-left:14.5pt">Mosaic Group, a leading developer and provider of global subscription mobile applications. Mosaic Group has a portfolio of some of the largest and most popular applications including:</span></div><div style="margin-bottom:12pt;padding-left:72pt;text-indent:-18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">◦</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%;padding-left:14.46pt">iTranslate, which 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, acquired in March 2018. </span></div><div style="margin-bottom:12pt;padding-left:72pt;text-indent:-18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">◦</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%;padding-left:14.46pt">TelTech, which develops and distributes unique and innovative mobile communications applications that help protect consumer privacy, acquired in October 2018. </span></div><div style="margin-bottom:12pt;padding-left:72pt;text-indent:-18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">◦</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%;padding-left:14.46pt">Daily Burn, a health and fitness business, which provides streaming fitness and workout videos across a variety of platforms (including mobile, web and other Internet-enabled television platforms).</span></div><div style="margin-bottom:12pt;padding-left:36pt;text-indent:-18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">•</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%;padding-left:14.5pt">Care.com, the leading online destination for families to easily connect with caregivers for their children, aging parents, pets and homes and for a wide variety of caregivers to easily connect with families, which we acquired on February 11, 2020;</span></div><div style="margin-bottom:12pt;padding-left:36pt;text-indent:-18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">•</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%;padding-left:14.5pt">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><div style="margin-bottom:12pt;padding-left:36pt;text-indent:-18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">•</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%;padding-left:14.5pt">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><div style="margin-bottom:12pt;padding-left:36pt;text-indent:-18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">•</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%;padding-left:14.5pt">NurseFly, a platform to efficiently connect healthcare professionals with job opportunities, which we acquired a controlling interest in on June 26, 2019;</span></div><div style="margin-bottom:12pt;padding-left:36pt;text-indent:-18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">•</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%;padding-left:14.5pt">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><div style="margin-bottom:12pt;padding-left:36pt;text-indent:-18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">•</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%;padding-left:14.5pt">For periods prior to their sales:</span></div><div style="margin-bottom:12pt;padding-left:72pt;text-indent:-18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">◦</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%;padding-left:14.46pt">College Humor Media, a provider of digital content, including its subscription only property, Dropout.tv, sold March 16, 2020. </span></div><div style="margin-bottom:12pt;padding-left:72pt;text-indent:-18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">◦</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%;padding-left:14.46pt">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><div style="margin-bottom:12pt;padding-left:72pt;text-indent:-18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">◦</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%;padding-left:14.46pt">Dictionary.com, an online and mobile dictionary and thesaurus service, sold November 13, 2018.</span></div><div style="margin-bottom:12pt;padding-left:72pt;text-indent:-18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">◦</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%;padding-left:14.46pt">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><div style="margin-bottom:12pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Discontinued Operations</span></div><div style="margin-bottom:12pt;text-indent:22.5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Discontinued operations in the accompanying financial statements include Vimeo for all periods. The notes accompanying these consolidated and combined financial statements reflect our continuing operations and, unless otherwise noted, exclude information related to Vimeo. See “</span><span style="color:#0000ff;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%;text-decoration:underline"><a href="#i26ec69a8d3e348129296261da510ea0b_2258" style="color:#0000ff;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%;text-decoration:underline">Note 4—Discontinued Operations</a></span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">” for additional details.</span></div>
CY2020	iaci	Numberof Service Categories NumberofServiceCategories	500	category
CY2020Q4	iaci	Numberof Service Professionals NumberofServiceProfessionals	240000	professional
CY2020Q4	iaci	Numberof Projects NumberofProjects	32000000	project
CY2020Q1	us-gaap	Equity Securities Without Readily Determinable Fair Value Impairment Loss Cumulative Amount EquitySecuritiesWithoutReadilyDeterminableFairValueImpairmentLossCumulativeAmount	51500000	USD
CY2020Q1	iaci	Impairmentof Notes Receivableand Warrants ImpairmentofNotesReceivableandWarrants	7500000	USD
CY2020	us-gaap	Use Of Estimates UseOfEstimates	<div style="margin-bottom:12pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Accounting Estimates</span></div><div style="margin-bottom:12pt;text-indent:24.75pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Management of the Company is required to make certain estimates, judgments and assumptions during the preparation of its financial statements in accordance with GAAP. These estimates, judgments and assumptions impact the reported amounts of assets, liabilities, revenue and expenses and the related disclosure of assets and liabilities. Actual results could differ from these estimates.</span></div><div style="margin-bottom:12pt;text-indent:22.5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">On an ongoing basis, the Company evaluates its estimates, judgments and assumptions, including those related to: the fair values of cash equivalents and marketable debt and equity securities; the carrying value of accounts receivable, including the determination of the allowance for credit losses; the determination of revenue reserves; the determination of the customer relationship period for certain costs to obtain a contract with a customer; the carrying value of right-of-use assets ("ROU assets"); the useful lives and recoverability of building, capitalized software, leasehold improvements and equipment and definite-lived intangible assets; 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, judgments and assumptions on historical experience, its forecasts and budgets and other factors that the Company considers relevant.</span></div>
CY2020Q4	iaci	Number Of Equity Method Investments NumberOfEquityMethodInvestments	1	investment
CY2019Q4	us-gaap	Equity Method Investments EquityMethodInvestments	0	USD
CY2020	us-gaap	Capitalized Contract Cost Amortization CapitalizedContractCostAmortization	101300000	USD
CY2019	us-gaap	Capitalized Contract Cost Amortization CapitalizedContractCostAmortization	94900000	USD
CY2018	us-gaap	Capitalized Contract Cost Amortization CapitalizedContractCostAmortization	70300000	USD
CY2020Q4	us-gaap	Contract With Customer Asset Net Current ContractWithCustomerAssetNetCurrent	58800000	USD
CY2019Q4	us-gaap	Contract With Customer Asset Net Current ContractWithCustomerAssetNetCurrent	41400000	USD
CY2018Q1	us-gaap	Contract With Customer Asset Net Current ContractWithCustomerAssetNetCurrent	40100000	USD
CY2020Q4	us-gaap	Contract With Customer Asset Net Noncurrent ContractWithCustomerAssetNetNoncurrent	4400000	USD
CY2019Q4	us-gaap	Contract With Customer Asset Net Noncurrent ContractWithCustomerAssetNetNoncurrent	4000000.0	USD
CY2018Q1	us-gaap	Contract With Customer Asset Net Noncurrent ContractWithCustomerAssetNetNoncurrent	3400000	USD
CY2020	iaci	Accounts Receivable Periodof Payment Due AccountsReceivablePeriodofPaymentDue	P30D
CY2019Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	19984000	USD
CY2020	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	78931000	USD
CY2020	us-gaap	Allowance For Doubtful Accounts Receivable Write Offs AllowanceForDoubtfulAccountsReceivableWriteOffs	74170000	USD
CY2020	us-gaap	Allowance For Doubtful Accounts Receivable Recoveries AllowanceForDoubtfulAccountsReceivableRecoveries	2433000	USD
CY2020Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	27178000	USD
CY2020Q4	iaci	Revenue Reserve RevenueReserve	2100000	USD
CY2019Q4	iaci	Revenue Reserve RevenueReserve	3900000	USD
CY2020Q4	iaci	Accounts Receivable Allowancefor Credit Loss Currentand Revenue Reserve AccountsReceivableAllowanceforCreditLossCurrentandRevenueReserve	29200000	USD
CY2019Q4	iaci	Accounts Receivable Allowancefor Credit Loss Currentand Revenue Reserve AccountsReceivableAllowanceforCreditLossCurrentandRevenueReserve	23900000	USD
CY2019Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	94700000	USD
CY2019Q4	us-gaap	Contract With Customer Liability Noncurrent ContractWithCustomerLiabilityNoncurrent	600000	USD
CY2018Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	83300000	USD
CY2018Q4	us-gaap	Contract With Customer Liability Noncurrent ContractWithCustomerLiabilityNoncurrent	1000000.0	USD
CY2019	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	79700000	USD
CY2020	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	86600000	USD
CY2020Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	137700000	USD
CY2020Q4	us-gaap	Contract With Customer Liability Noncurrent ContractWithCustomerLiabilityNoncurrent	700000	USD
CY2020	iaci	Cash Equivalents Maturity Period At Purchase Less Than CashEquivalentsMaturityPeriodAtPurchaseLessThan	P91D
CY2019Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	0	USD
CY2020	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	<div style="margin-bottom:12pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Certain Risks and Concentrations—Services Agreement with Google (the "Services Agreement")</span></div><div style="margin-bottom:12pt;text-indent:22.5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">A meaningful portion of the Company's revenue (and a substantial portion of IAC’s net cash from operations that it can freely access) is attributable to 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 December 31, 2020, 2019 and 2018, total revenue earned from Google was $556.1 million, $732.1 million and $823.1 million, respectively, representing 20%, 29%, and 35%, respectively, of the Company's total revenue. The related accounts receivable totaled $61.9 million and $53.0 million at December 31, 2020 and 2019, respectively. </span></div><div style="margin-bottom:12pt;text-indent:22.5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The total revenue earned from the Services Agreement for the years ended December 31, 2020, 2019 and 2018, was $498.3 million, $677.0 million and $765.6 million, respectively, representing 18%, 27% and 32%, respectively, of the Company's total revenue.</span></div><div style="margin-bottom:12pt;text-indent:22.5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The revenue attributable to the Services Agreement is earned by the Desktop business and Ask Media Group, both within the Search segment. For the years ended December 31, 2020, 2019 and 2018, revenue earned from the Services Agreement was $153.5 million, $291.1 million and $426.5 million, respectively, within the Desktop business and $344.8 million, $385.9 million and $339.0 million, respectively, within Ask Media Group.</span></div><div style="margin-bottom:12pt;text-indent:22.5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The Services Agreement expires on March 31, 2023; provided that during each September, 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. Neither party gave notice to the other party to terminate the Services Agreement pursuant to this provision in September 2020. 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 have in the past and could in the future require modifications to, or prohibit and/or render obsolete certain of our products, services and/or business practices, which have been and could be costly to address and have had or otherwise could have an adverse effect on our financial condition and results of operations. 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 and it may do so in the future.</span></div><div style="margin-bottom:12pt;text-indent:22.5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Certain industry-wide policy changes became effective on July 1, 2019 and August 27, 2020. These industry-wide changes, combined with other changes to policies 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. In addition, at multiple times during the fourth quarter of 2020, Google suspended services with respect to some of IAC's products and may do so in the future. The Desktop business elected to modify certain marketing strategies in early January 2021. This is expected to further reduce the revenue and profitability of the Desktop business in 2021.</span></div><div style="margin-bottom:12pt;text-indent:22.5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The reduction in revenue and profitability was the primary factor in the goodwill and indefinite-lived intangible asset impairments related to the Desktop business recorded in the year ended December 31, 2020 of $265.1 million and $32.2 million respectively. The impact of COVD-19 was an additional factor.</span></div><div style="margin-bottom:12pt;text-indent:22.5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:700;line-height:107%">Credit Risk</span></div><div style="margin-bottom:12pt;text-indent:22.5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Financial instruments, which potentially subject the Company to concentration of credit risk, consist primarily of cash and cash equivalents. Cash and cash equivalents are maintained with financial institutions and are in excess of Federal Deposit Insurance Corporation insurance limits.</span></div><div style="margin-bottom:12pt;text-indent:22.5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:700;line-height:120%">Other Risks</span></div><div style="margin-bottom:12pt;text-indent:22.5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The Company 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>
CY2018	iaci	Putand Call Arrangements Exercised PutandCallArrangementsExercised	2	putOrCall
CY2020	us-gaap	Advertising Expense AdvertisingExpense	796700000	USD
CY2019	us-gaap	Advertising Expense AdvertisingExpense	795100000	USD
CY2018	us-gaap	Advertising Expense AdvertisingExpense	753300000	USD
CY2020	us-gaap	Acquired Finite Lived Intangible Assets Weighted Average Useful Life AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife	P18M
CY2019	iaci	Putand Call Arrangements Exercised PutandCallArrangementsExercised	1	putOrCall
CY2020	iaci	Putand Call Arrangements Exercised PutandCallArrangementsExercised	1	putOrCall
CY2020	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	<div style="margin-bottom:12pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Reclassifications</span></div><div style="margin-bottom:12pt;text-indent:22.5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Certain prior year amounts have been reclassified to conform to the current year presentation.</span></div>
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	234345000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	-11249000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	311052000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	9815000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	45566000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	33895000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	244160000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	34317000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	344947000	USD
CY2020	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-29181000	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-1117000	USD
CY2020	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	2326000	USD
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-1187000	USD
CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	157000	USD
CY2018	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	1514000	USD
CY2020	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	-496000	USD
CY2019	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	2985000	USD
CY2018	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	3727000	USD
CY2020	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-27351000	USD
CY2019	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	2025000	USD
CY2018	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	4054000	USD
CY2020	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-8097000	USD
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-39454000	USD
CY2018	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	28755000	USD
CY2020	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-6126000	USD
CY2019	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-9746000	USD
CY2018	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-6073000	USD
CY2020	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-4133000	USD
CY2019	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-174000	USD
CY2018	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-4119000	USD
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-18356000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-49374000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	18563000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-45707000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-47349000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	22617000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	392871000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	195236000	USD
CY2020Q4	iaci	Deferred Tax Assets Lease Liabilities Noncurrent DeferredTaxAssetsLeaseLiabilitiesNoncurrent	58457000	USD
CY2019Q4	iaci	Deferred Tax Assets Lease Liabilities Noncurrent DeferredTaxAssetsLeaseLiabilitiesNoncurrent	41426000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	41970000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	32547000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	41850000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	59998000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	17247000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	11273000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	32043000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	18985000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	584438000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	359465000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	111691000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	91180000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	472747000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	268285000	USD
CY2020Q4	iaci	Deferred Tax Liabilities Investment In Subsidiaries DeferredTaxLiabilitiesInvestmentInSubsidiaries	242537000	USD
CY2019Q4	iaci	Deferred Tax Liabilities Investment In Subsidiaries DeferredTaxLiabilitiesInvestmentInSubsidiaries	240420000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Investments DeferredTaxLiabilitiesInvestments	197998000	USD
CY2020Q4	iaci	Deferred Tax Liabilities Right Of Use Assets DeferredTaxLiabilitiesRightOfUseAssets	43074000	USD
CY2019Q4	iaci	Deferred Tax Liabilities Right Of Use Assets DeferredTaxLiabilitiesRightOfUseAssets	29059000	USD
CY2020Q4	iaci	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets And Other DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssetsAndOther	34170000	USD
CY2019Q4	iaci	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets And Other DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssetsAndOther	31937000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	31571000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	30278000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	549350000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	331694000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	76603000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	63409000	USD
CY2020	iaci	Income Tax Expense Benefit Related To Operating Loss Carryforwards IncomeTaxExpenseBenefitRelatedToOperatingLossCarryforwards	-235100000	USD
CY2020	iaci	Income Tax Expense Benefit Related To Operating Loss Carryforwards Recorded As Reduction To Goodwill IncomeTaxExpenseBenefitRelatedToOperatingLossCarryforwardsRecordedAsReductionToGoodwill	-32100000	USD
CY2020Q4	us-gaap	Tax Credit Carryforward Amount TaxCreditCarryforwardAmount	57300000	USD
CY2020	iaci	Tax Credit Carryforwards Not Subject To Expiration TaxCreditCarryforwardsNotSubjectToExpiration	11400000	USD
CY2020	iaci	Tax Credit Carryforward Amount Expiring Within Ten Years TaxCreditCarryforwardAmountExpiringWithinTenYears	45900000	USD
CY2020	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	-20500000	USD
CY2020Q4	iaci	Deferred Tax Assets Valuation Allowance Amount DeferredTaxAssetsValuationAllowanceAmount	111700000	USD
CY2020	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	51274000	USD
CY2019	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	7207000	USD
CY2018	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	72439000	USD
CY2020	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	16995000	USD
CY2019	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	468000	USD
CY2018	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	6188000	USD
CY2020	iaci	Effective Income Tax Rate Reconciliation Stock Based Compensation EffectiveIncomeTaxRateReconciliationStockBasedCompensation	163633000	USD
CY2019	iaci	Effective Income Tax Rate Reconciliation Stock Based Compensation EffectiveIncomeTaxRateReconciliationStockBasedCompensation	56708000	USD
CY2018	iaci	Effective Income Tax Rate Reconciliation Stock Based Compensation EffectiveIncomeTaxRateReconciliationStockBasedCompensation	39110000	USD
CY2020	us-gaap	Income Tax Reconciliation Nondeductible Expense Impairment Losses IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses	53012000	USD
CY2019	us-gaap	Income Tax Reconciliation Nondeductible Expense Impairment Losses IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses	0	USD
CY2018	us-gaap	Income Tax Reconciliation Nondeductible Expense Impairment Losses IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses	0	USD
CY2020	iaci	Effective Income Tax Rate Reconciliation Nondeductible Expense Executive Compensation Amount EffectiveIncomeTaxRateReconciliationNondeductibleExpenseExecutiveCompensationAmount	14219000	USD
CY2019	iaci	Effective Income Tax Rate Reconciliation Nondeductible Expense Executive Compensation Amount EffectiveIncomeTaxRateReconciliationNondeductibleExpenseExecutiveCompensationAmount	7409000	USD
CY2018	iaci	Effective Income Tax Rate Reconciliation Nondeductible Expense Executive Compensation Amount EffectiveIncomeTaxRateReconciliationNondeductibleExpenseExecutiveCompensationAmount	2983000	USD
CY2020	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	11385000	USD
CY2019	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-7365000	USD
CY2018	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-1280000	USD
CY2020	us-gaap	Income Tax Reconciliation Tax Credits Research IncomeTaxReconciliationTaxCreditsResearch	6078000	USD
CY2019	us-gaap	Income Tax Reconciliation Tax Credits Research IncomeTaxReconciliationTaxCreditsResearch	4449000	USD
CY2018	us-gaap	Income Tax Reconciliation Tax Credits Research IncomeTaxReconciliationTaxCreditsResearch	2577000	USD
CY2020	iaci	Effective Income Tax Reconciliation Amortizable Tax Basis Due To Intercompany Transaction Amount EffectiveIncomeTaxReconciliationAmortizableTaxBasisDueToIntercompanyTransactionAmount	-7044000	USD
CY2019	iaci	Effective Income Tax Reconciliation Amortizable Tax Basis Due To Intercompany Transaction Amount EffectiveIncomeTaxReconciliationAmortizableTaxBasisDueToIntercompanyTransactionAmount	0	USD
CY2018	iaci	Effective Income Tax Reconciliation Amortizable Tax Basis Due To Intercompany Transaction Amount EffectiveIncomeTaxReconciliationAmortizableTaxBasisDueToIntercompanyTransactionAmount	0	USD
CY2020	us-gaap	Income Tax Reconciliation Nondeductible Expense IncomeTaxReconciliationNondeductibleExpense	5947000	USD
CY2019	us-gaap	Income Tax Reconciliation Nondeductible Expense IncomeTaxReconciliationNondeductibleExpense	5353000	USD
CY2018	us-gaap	Income Tax Reconciliation Nondeductible Expense IncomeTaxReconciliationNondeductibleExpense	1634000	USD
CY2020	iaci	Effective Income Tax Reconciliation Adjustment To Beginning Of Year Valuation Allowance Amount EffectiveIncomeTaxReconciliationAdjustmentToBeginningOfYearValuationAllowanceAmount	-3544000	USD
CY2020	iaci	Effective Income Tax Reconciliation Adjustments On The Reconciliation Of Income Tax Provisions To Tax Returns Amount EffectiveIncomeTaxReconciliationAdjustmentsOnTheReconciliationOfIncomeTaxProvisionsToTaxReturnsAmount	-2383000	USD
CY2019	iaci	Effective Income Tax Reconciliation Adjustments On The Reconciliation Of Income Tax Provisions To Tax Returns Amount EffectiveIncomeTaxReconciliationAdjustmentsOnTheReconciliationOfIncomeTaxProvisionsToTaxReturnsAmount	388000	USD
CY2018	iaci	Effective Income Tax Reconciliation Adjustments On The Reconciliation Of Income Tax Provisions To Tax Returns Amount EffectiveIncomeTaxReconciliationAdjustmentsOnTheReconciliationOfIncomeTaxProvisionsToTaxReturnsAmount	85000	USD
CY2020	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	-14508000	USD
CY2019	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	-688000	USD
CY2018	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	-13646000	USD
CY2020	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-1349000	USD
CY2019	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	1036000	USD
CY2018	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-4099000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-45707000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-47349000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	22617000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	16585000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	14425000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	13937000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	3419000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	2332000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	1083000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	3733000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	2313000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	238000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	172000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	351000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	410000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	767000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	18233000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	16585000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	14425000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	20100000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	18800000	USD
CY2020Q4	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	18500000	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	17400000	USD
CY2020Q4	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	5700000	USD
CY2020	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	2807633000	USD
CY2019	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	2708423000	USD
CY2020	us-gaap	Business Acquisitions Pro Forma Income Loss From Continuing Operations Before Changes In Accounting And Extraordinary Items Net Of Tax BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax	317073000	USD
CY2019	us-gaap	Business Acquisitions Pro Forma Income Loss From Continuing Operations Before Changes In Accounting And Extraordinary Items Net Of Tax BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax	41844000	USD
CY2020	us-gaap	Business Acquisition Pro Forma Income Loss From Continuing Operations Before Changes In Accounting And Extraordinary Items Net Of Tax Per Share Basic BusinessAcquisitionProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTaxPerShareBasic	3.72
CY2019	us-gaap	Business Acquisition Pro Forma Income Loss From Continuing Operations Before Changes In Accounting And Extraordinary Items Net Of Tax Per Share Basic BusinessAcquisitionProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTaxPerShareBasic	0.37
CY2020	us-gaap	Business Acquisition Pro Forma Income Loss From Continuing Operations Before Changes In Accounting And Extraordinary Items Net Of Tax Per Share Diluted BusinessAcquisitionProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTaxPerShareDiluted	3.50
CY2019	us-gaap	Business Acquisition Pro Forma Income Loss From Continuing Operations Before Changes In Accounting And Extraordinary Items Net Of Tax Per Share Diluted BusinessAcquisitionProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTaxPerShareDiluted	0.37
CY2020	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	296933000	USD
CY2019	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	-16926000	USD
CY2020	us-gaap	Business Acquisition Pro Forma Earnings Per Share Basic BusinessAcquisitionProFormaEarningsPerShareBasic	3.48
CY2019	us-gaap	Business Acquisition Pro Forma Earnings Per Share Basic BusinessAcquisitionProFormaEarningsPerShareBasic	-0.20
CY2020	us-gaap	Business Acquisition Pro Forma Earnings Per Share Diluted BusinessAcquisitionProFormaEarningsPerShareDiluted	3.26
CY2019	us-gaap	Business Acquisition Pro Forma Earnings Per Share Diluted BusinessAcquisitionProFormaEarningsPerShareDiluted	-0.20
CY2020Q4	us-gaap	Goodwill Goodwill	1660102000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	1397493000	USD
CY2020Q4	us-gaap	Indefinite Lived Intangible Assets Excluding Goodwill IndefiniteLivedIntangibleAssetsExcludingGoodwill	246913000	USD
CY2019Q4	us-gaap	Indefinite Lived Intangible Assets Excluding Goodwill IndefiniteLivedIntangibleAssetsExcludingGoodwill	225296000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	148073000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	99256000	USD
CY2020Q4	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	2055088000	USD
CY2019Q4	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	1722045000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	1397493000	USD
CY2020	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	522070000	USD
CY2020	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	265146000	USD
CY2020	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	5685000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	1660102000	USD
CY2018Q4	us-gaap	Goodwill Goodwill	1406965000	USD
CY2019	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	23091000	USD
CY2019	iaci	Goodwill Deductions During Period GoodwillDeductionsDuringPeriod	29293000	USD
CY2019	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	3318000	USD
CY2019	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	48000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	1397493000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	392866000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	244793000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	148073000	USD
CY2020	us-gaap	Finite Lived Intangible Asset Useful Life FiniteLivedIntangibleAssetUsefulLife	P4Y1M6D
CY2019Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	281608000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	182352000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	99256000	USD
CY2019	us-gaap	Finite Lived Intangible Asset Useful Life FiniteLivedIntangibleAssetUsefulLife	P3Y9M18D
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	57018000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	34159000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	21760000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	11292000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	9040000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive	14804000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	148073000	USD
CY2020Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	224976000	USD
CY2020Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	3000	USD
CY2020Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	0	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Securities Current AvailableForSaleSecuritiesDebtSecuritiesCurrent	224979000	USD
CY2019Q4	us-gaap	Trading Securities TradingSecurities	0	USD
CY2020	iaci	Contractual Maturityof Current Availablefor Sale Securities ContractualMaturityofCurrentAvailableforSaleSecurities	P1Y
CY2020Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	0	USD
CY2020Q4	us-gaap	Equity Securities Without Readily Determinable Fair Value Amount EquitySecuritiesWithoutReadilyDeterminableFairValueAmount	296491000	USD
CY2019Q4	us-gaap	Equity Securities Without Readily Determinable Fair Value Amount EquitySecuritiesWithoutReadilyDeterminableFairValueAmount	347975000	USD
CY2020Q4	us-gaap	Equity Method Investments EquityMethodInvestments	1152000	USD
CY2019Q4	us-gaap	Equity Method Investments EquityMethodInvestments	0	USD
CY2020Q4	us-gaap	Long Term Investments LongTermInvestments	297643000	USD
CY2019Q4	us-gaap	Long Term Investments LongTermInvestments	347975000	USD
CY2020Q1	us-gaap	Equity Securities Without Readily Determinable Fair Value Impairment Loss Cumulative Amount EquitySecuritiesWithoutReadilyDeterminableFairValueImpairmentLossCumulativeAmount	51500000	USD
CY2020	us-gaap	Equity Securities Without Readily Determinable Fair Value Upward Price Adjustment Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueUpwardPriceAdjustmentAnnualAmount	0	USD
CY2019	us-gaap	Equity Securities Without Readily Determinable Fair Value Upward Price Adjustment Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueUpwardPriceAdjustmentAnnualAmount	19698000	USD
CY2020	us-gaap	Equity Securities Without Readily Determinable Fair Value Downward Price Adjustment Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueDownwardPriceAdjustmentAnnualAmount	51484000	USD
CY2019	us-gaap	Equity Securities Without Readily Determinable Fair Value Downward Price Adjustment Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueDownwardPriceAdjustmentAnnualAmount	1193000	USD
CY2020	iaci	Equity Securitieswithout Readily Determinable Fair Value Annual Amount EquitySecuritieswithoutReadilyDeterminableFairValueAnnualAmount	-51484000	USD
CY2019	iaci	Equity Securitieswithout Readily Determinable Fair Value Annual Amount EquitySecuritieswithoutReadilyDeterminableFairValueAnnualAmount	18505000	USD
CY2020Q4	us-gaap	Equity Securities Without Readily Determinable Fair Value Upward Price Adjustment Cumulative Amount EquitySecuritiesWithoutReadilyDeterminableFairValueUpwardPriceAdjustmentCumulativeAmount	19700000	USD
CY2020Q4	us-gaap	Equity Securities Without Readily Determinable Fair Value Downward Price Adjustment Cumulative Amount EquitySecuritiesWithoutReadilyDeterminableFairValueDownwardPriceAdjustmentCumulativeAmount	43500000	USD
CY2020	us-gaap	Equity Securities Fv Ni Realized Gain Loss EquitySecuritiesFvNiRealizedGainLoss	2161000	USD
CY2019	us-gaap	Equity Securities Fv Ni Realized Gain Loss EquitySecuritiesFvNiRealizedGainLoss	22880000	USD
CY2018	us-gaap	Equity Securities Fv Ni Realized Gain Loss EquitySecuritiesFvNiRealizedGainLoss	27366000	USD
CY2020	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	797565000	USD
CY2019	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	18505000	USD
CY2018	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	126063000	USD
CY2020	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	799726000	USD
CY2019	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	41385000	USD
CY2018	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	153429000	USD
CY2020Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	5087339000	USD
CY2020Q4	us-gaap	Business Combination Contingent Consideration Liability BusinessCombinationContingentConsiderationLiability	0	USD
CY2019Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	731124000	USD
CY2019Q4	us-gaap	Business Combination Contingent Consideration Liability BusinessCombinationContingentConsiderationLiability	6918000	USD
CY2020Q4	iaci	Prepaid Debt Principal Payments PrepaidDebtPrincipalPayments	13800000	USD
CY2020Q4	us-gaap	Business Combination Contingent Consideration Arrangements Range Of Outcomes Value High BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh	15000000.0	USD
CY2020Q4	us-gaap	Business Combination Contingent Consideration Liability BusinessCombinationContingentConsiderationLiability	0	USD
CY2019Q4	us-gaap	Business Combination Contingent Consideration Liability Noncurrent BusinessCombinationContingentConsiderationLiabilityNoncurrent	6900000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	27500000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	192500000	USD
CY2020Q4	iaci	Long Term Debt Maturity Year Eight LongTermDebtMaturityYearEight	500000000	USD
CY2020Q4	us-gaap	Long Term Debt LongTermDebt	720000000	USD
CY2020Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	7723000	USD
CY2020Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	712277000	USD
CY2020	iaci	Percentage Of Directors Elected By Holders Of Common Stock PercentageOfDirectorsElectedByHoldersOfCommonStock	0.25
CY2020	iaci	Percentage Of Directors Elected By Holders Of Common Stock PercentageOfDirectorsElectedByHoldersOfCommonStock	0.25
CY2020Q4	us-gaap	Stock Repurchase Program Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased	8000000.0	shares
CY2018Q4	us-gaap	Aoci Tax Attributable To Parent AociTaxAttributableToParent	0	USD
CY2020Q4	us-gaap	Aoci Tax Attributable To Parent AociTaxAttributableToParent	0	USD
CY2019Q4	us-gaap	Aoci Tax Attributable To Parent AociTaxAttributableToParent	0	USD
CY2020	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	289867000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	289867000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	81666000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	81666000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	322330000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	322330000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Attributable To Noncontrolling Entity IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity	-726000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Attributable To Noncontrolling Entity IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity	-726000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Attributable To Noncontrolling Entity IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity	9945000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Attributable To Noncontrolling Entity IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity	9945000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Attributable To Noncontrolling Entity IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity	46181000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Attributable To Noncontrolling Entity IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity	46181000	USD
CY2020	us-gaap	Dilutive Securities DilutiveSecurities	71000	USD
CY2019	us-gaap	Dilutive Securities DilutiveSecurities	0	USD
CY2018	us-gaap	Dilutive Securities DilutiveSecurities	0	USD
CY2020	us-gaap	Net Income Loss From Continuing Operations Available To Common Shareholders Basic NetIncomeLossFromContinuingOperationsAvailableToCommonShareholdersBasic	290593000	USD
CY2020	us-gaap	Net Income Loss From Continuing Operations Available To Common Shareholders Diluted NetIncomeLossFromContinuingOperationsAvailableToCommonShareholdersDiluted	290664000	USD
CY2019	us-gaap	Net Income Loss From Continuing Operations Available To Common Shareholders Basic NetIncomeLossFromContinuingOperationsAvailableToCommonShareholdersBasic	71721000	USD
CY2019	us-gaap	Net Income Loss From Continuing Operations Available To Common Shareholders Diluted NetIncomeLossFromContinuingOperationsAvailableToCommonShareholdersDiluted	71721000	USD
CY2018	us-gaap	Net Income Loss From Continuing Operations Available To Common Shareholders Basic NetIncomeLossFromContinuingOperationsAvailableToCommonShareholdersBasic	276149000	USD
CY2018	us-gaap	Net Income Loss From Continuing Operations Available To Common Shareholders Diluted NetIncomeLossFromContinuingOperationsAvailableToCommonShareholdersDiluted	276149000	USD
CY2020	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	-21281000	USD
CY2020	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	-21281000	USD
CY2019	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	-49483000	USD
CY2019	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	-49483000	USD
CY2018	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	-29959000	USD
CY2018	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	-29959000	USD
CY2020	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Noncontrolling Interest IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToNoncontrollingInterest	414000	USD
CY2020	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Noncontrolling Interest IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToNoncontrollingInterest	414000	USD
CY2019	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Noncontrolling Interest IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToNoncontrollingInterest	657000	USD
CY2019	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Noncontrolling Interest IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToNoncontrollingInterest	657000	USD
CY2018	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Noncontrolling Interest IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToNoncontrollingInterest	582000	USD
CY2018	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Noncontrolling Interest IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToNoncontrollingInterest	582000	USD
CY2020	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	-20867000	USD
CY2020	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	-20867000	USD
CY2019	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	-48826000	USD
CY2019	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	-48826000	USD
CY2018	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	-29377000	USD
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	90948000	shares
CY2018	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	-29377000	USD
CY2020	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	269726000	USD
CY2020	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	269797000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	22895000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	22895000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	246772000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	246772000	USD
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	85355000	shares
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	85355000	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	85132000	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	85132000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	85132000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	85132000	shares
CY2020	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	5593000	shares
CY2019	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	0	shares
CY2018	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	0	shares
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	85355000	shares
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	3909000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	85132000	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	85132000	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	85132000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	85132000	shares
CY2020	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	3.40
CY2020	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	3.20
CY2019	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.84
CY2019	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.84
CY2018	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	3.24
CY2018	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	3.24
CY2020	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	-0.24
CY2020	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	-0.23
CY2019	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	-0.57
CY2019	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	-0.57
CY2018	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	-0.34
CY2018	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	-0.34
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.16
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.97
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.27
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.27
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.90
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.90
CY2020Q4	iaci	Term Of Employment Agreement And Restricted Stock Agreement TermOfEmploymentAgreementAndRestrictedStockAgreement	P10Y
CY2020	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	3100000	shares
CY2020	iaci	Share Based Compensation Arrangement By Share Based Payment Award Number Of Active Plans ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfActivePlans	1	plan
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	31100000	shares
CY2020Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	385900000	USD
CY2020	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P6Y4M24D
CY2020	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	198300000	USD
CY2019	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	81500000	USD
CY2018	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	79600000	USD
CY2020Q4	iaci	Term Of Employment Agreement And Restricted Stock Agreement TermOfEmploymentAgreementAndRestrictedStockAgreement	P10Y
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	4498000	shares
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	20.08
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	0	shares
CY2020	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	0
CY2020	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	587000	shares
CY2020	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	13.46
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	0	shares
CY2020	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	0
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod	2000	shares
CY2020	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice	14.05
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	21.08
CY2020	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P4Y10M24D
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	657704000	USD
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	3909000	shares
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	21.08
CY2020	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1	P4Y10M24D
CY2020Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	657704000	USD
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	74800000	USD
CY2020Q4	us-gaap	Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Number Of Outstanding Options ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions	3909000	shares
CY2020	us-gaap	Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Outstanding Options Weighted Average Remaining Contractual Term2 SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageRemainingContractualTerm2	P4Y10M24D
CY2020Q4	us-gaap	Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Outstanding Options Weighted Average Exercise Price Beginning Balance1 SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1	21.08
CY2020Q4	us-gaap	Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Number Of Exercisable Options ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions	3909000	shares
CY2020	us-gaap	Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Exercisable Options Weighted Average Remaining Contractual Term2 SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageRemainingContractualTerm2	P4Y10M24D
CY2020Q4	us-gaap	Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Exercisable Options Weighted Average Exercise Price1 SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1	21.08
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Plan Modification Incremental Compensation Cost ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost	20500000	USD
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2764536000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2509980000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2373519000	USD
CY2020	us-gaap	Revenues Revenues	2764536000	USD
CY2019	us-gaap	Revenues Revenues	2509980000	USD
CY2018	us-gaap	Revenues Revenues	2373519000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	274930000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	34317000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	302417000	USD
CY2020	us-gaap	Operating Income Loss OperatingIncomeLoss	-537663000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	5734000	USD
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	75274000	USD
CY2020	us-gaap	Operating Income Loss OperatingIncomeLoss	-537663000	USD
CY2020	us-gaap	Interest Expense InterestExpense	16166000	USD
CY2020	us-gaap	Unrealized Gain Loss On Investments UnrealizedGainLossOnInvestments	840550000	USD
CY2020	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-42561000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	244160000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-45707000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	289867000	USD
CY2020	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	-21281000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	268586000	USD
CY2020	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-1140000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	269726000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	5734000	USD
CY2019	us-gaap	Interest Expense InterestExpense	11904000	USD
CY2019	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	40487000	USD
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	165034000	USD
CY2019	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	-49483000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	32183000	USD
CY2019	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	9288000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-47349000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	81666000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	22895000	USD
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	75274000	USD
CY2018	us-gaap	Interest Expense InterestExpense	13059000	USD
CY2018	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	282732000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	344947000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	22617000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	322330000	USD
CY2018	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	-29959000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	292371000	USD
CY2018	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	45599000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	246772000	USD
CY2020	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	60726000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	95097000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	54471000	USD
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	170153000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	136020000	USD
CY2020Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	27143000	USD
CY2019Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	21894000	USD
CY2020Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	205362000	USD
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	232505000	USD
CY2019Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	186928000	USD
CY2020	us-gaap	Operating Lease Cost OperatingLeaseCost	38713000	USD
CY2019	us-gaap	Operating Lease Cost OperatingLeaseCost	26584000	USD
CY2020	us-gaap	Variable Lease Cost VariableLeaseCost	10562000	USD
CY2019	us-gaap	Variable Lease Cost VariableLeaseCost	7704000	USD
CY2020	us-gaap	Lease Cost LeaseCost	49275000	USD
CY2019	us-gaap	Lease Cost LeaseCost	34288000	USD
CY2020	us-gaap	Short Term Lease Cost ShortTermLeaseCost	5800000	USD
CY2019	us-gaap	Short Term Lease Cost ShortTermLeaseCost	2600000	USD
CY2020	us-gaap	Sublease Income SubleaseIncome	2500000	USD
CY2019	us-gaap	Sublease Income SubleaseIncome	2000000.0	USD
CY2020	iaci	Operating Lease Cost Vacating Office Space OperatingLeaseCostVacatingOfficeSpace	5300000	USD
CY2019	iaci	Operating Lease Cost Vacating Office Space OperatingLeaseCostVacatingOfficeSpace	7400000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	837916000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	37982000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	37875000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	36192000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	35106000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	26841000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	227409000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	401405000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	168900000	USD
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	232505000	USD
CY2020Q4	iaci	Lessee Operating Lease Lease Notyet Commenced Amount LesseeOperatingLeaseLeaseNotyetCommencedAmount	100000	USD
CY2020Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P15Y6M
CY2019Q4	us-gaap	Notes Receivable Related Parties NotesReceivableRelatedParties	55300000	USD
CY2020Q2	us-gaap	Notes Receivable Related Parties NotesReceivableRelatedParties	27200000	USD
CY2020	us-gaap	Defined Contribution Plan Maximum Annual Contributions Per Employee Percent DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent	0.50
	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent Of Match DefinedContributionPlanEmployerMatchingContributionPercentOfMatch	0.50
	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent DefinedContributionPlanEmployerMatchingContributionPercent	0.06
	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	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P17Y8M12D
CY2020Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0567
CY2019Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0613
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	80314000	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	60828000	USD
CY2020	us-gaap	Operating Lease Payments OperatingLeasePayments	41377000	USD
CY2019	us-gaap	Operating Lease Payments OperatingLeasePayments	33543000	USD
CY2020Q4	us-gaap	Loss Contingency Accrual At Carrying Value LossContingencyAccrualAtCarryingValue	0	USD
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	3366176000	USD
CY2019	iaci	Asset Impairment Charges Coronavirus Aid Relief And Economic Security Act AssetImpairmentChargesCoronavirusAidReliefAndEconomicSecurityAct	0	USD
CY2020	iaci	Asset Impairment Charges Coronavirus Aid Relief And Economic Security Act AssetImpairmentChargesCoronavirusAidReliefAndEconomicSecurityAct	59001000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	883991000	USD
CY2017Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	748580000	USD
CY2020Q4	us-gaap	Restricted Cash Current RestrictedCashCurrent	448000	USD
CY2019Q4	us-gaap	Restricted Cash Current RestrictedCashCurrent	503000	USD
CY2018Q4	us-gaap	Restricted Cash Current RestrictedCashCurrent	1417000	USD
CY2017Q4	us-gaap	Restricted Cash Current RestrictedCashCurrent	203000	USD
CY2020Q4	us-gaap	Restricted Cash Noncurrent RestrictedCashNoncurrent	449000	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
CY2020Q4	us-gaap	Disposal Group Including Discontinued Operation Cash And Cash Equivalents DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents	110037000	USD
CY2019Q4	us-gaap	Disposal Group Including Discontinued Operation Cash And Cash Equivalents DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents	1904000	USD
CY2018Q4	us-gaap	Disposal Group Including Discontinued Operation Cash And Cash Equivalents DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents	1008000	USD
CY2017Q4	us-gaap	Disposal Group Including Discontinued Operation Cash And Cash Equivalents DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents	11156000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Disposal Group Including Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsDisposalGroupIncludingDiscontinuedOperations	3477110000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Disposal Group Including Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsDisposalGroupIncludingDiscontinuedOperations	840732000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Disposal Group Including Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsDisposalGroupIncludingDiscontinuedOperations	886836000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Disposal Group Including Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsDisposalGroupIncludingDiscontinuedOperations	759939000	USD
CY2020Q4	us-gaap	Contract With Customer Asset Net Current ContractWithCustomerAssetNetCurrent	58788000	USD
CY2019Q4	us-gaap	Contract With Customer Asset Net Current ContractWithCustomerAssetNetCurrent	41401000	USD
CY2020Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	46096000	USD
CY2019Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	39050000	USD
CY2020Q4	iaci	Capitalize Access Fees Current CapitalizeAccessFeesCurrent	12730000	USD
CY2019Q4	iaci	Capitalize Access Fees Current CapitalizeAccessFeesCurrent	21985000	USD
CY2020Q4	us-gaap	Other Assets Miscellaneous Current OtherAssetsMiscellaneousCurrent	22408000	USD
CY2019Q4	us-gaap	Other Assets Miscellaneous Current OtherAssetsMiscellaneousCurrent	43626000	USD
CY2020Q4	us-gaap	Other Assets Current OtherAssetsCurrent	140022000	USD
CY2019Q4	us-gaap	Other Assets Current OtherAssetsCurrent	146062000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	482331000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	502966000	USD
CY2020Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	207401000	USD
CY2019Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	200549000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	274930000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	302417000	USD
CY2020Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	107280000	USD
CY2019Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	96869000	USD
CY2020Q4	us-gaap	Accrued Advertising Current AccruedAdvertisingCurrent	56286000	USD
CY2019Q4	us-gaap	Accrued Advertising Current AccruedAdvertisingCurrent	50868000	USD
CY2020Q4	iaci	Accrued Revenue Share Current AccruedRevenueShareCurrent	38710000	USD
CY2019Q4	iaci	Accrued Revenue Share Current AccruedRevenueShareCurrent	30574000	USD
CY2020Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	138130000	USD
CY2019Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	104497000	USD
CY2020Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	340406000	USD
CY2019Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	282808000	USD
CY2020	us-gaap	Gain On Sale Of Investments GainOnSaleOfInvestments	0	USD
CY2019	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	-9123000	USD
CY2018	iaci	Asset Impairment Charges Coronavirus Aid Relief And Economic Security Act AssetImpairmentChargesCoronavirusAidReliefAndEconomicSecurityAct	0	USD
CY2020	us-gaap	Equity Securities Fv Ni Unrealized Gain EquitySecuritiesFvNiUnrealizedGain	10373000	USD
CY2019	us-gaap	Equity Securities Fv Ni Unrealized Gain EquitySecuritiesFvNiUnrealizedGain	330000	USD
CY2018	us-gaap	Equity Securities Fv Ni Unrealized Gain EquitySecuritiesFvNiUnrealizedGain	589000	USD
CY2019	us-gaap	Gain On Sale Of Investments GainOnSaleOfInvestments	20486000	USD
CY2018	us-gaap	Gain On Sale Of Investments GainOnSaleOfInvestments	26777000	USD
CY2020	iaci	Equity Securities Without Readily Determinable Fair Value Net Upward Price Adjustment Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueNetUpwardPriceAdjustmentAnnualAmount	0	USD
CY2019	iaci	Equity Securities Without Readily Determinable Fair Value Net Upward Price Adjustment Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueNetUpwardPriceAdjustmentAnnualAmount	18505000	USD
CY2018	iaci	Equity Securities Without Readily Determinable Fair Value Net Upward Price Adjustment Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueNetUpwardPriceAdjustmentAnnualAmount	128786000	USD
CY2020	us-gaap	Interest Income Other InterestIncomeOther	7177000	USD
CY2019	us-gaap	Interest Income Other InterestIncomeOther	15159000	USD
CY2018	us-gaap	Interest Income Other InterestIncomeOther	9124000	USD
CY2020	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	1061000	USD
CY2019	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	0	USD
CY2018	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	121230000	USD
CY2020	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	-1213000	USD
CY2018	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	0	USD
CY2020	iaci	Mark To Market Charge Pertaining To Subsidiary Denominated Equity Instrument MarkToMarketChargePertainingToSubsidiaryDenominatedEquityInstrument	181000	USD
CY2019	iaci	Mark To Market Charge Pertaining To Subsidiary Denominated Equity Instrument MarkToMarketChargePertainingToSubsidiaryDenominatedEquityInstrument	1779000	USD
CY2018	iaci	Mark To Market Charge Pertaining To Subsidiary Denominated Equity Instrument MarkToMarketChargePertainingToSubsidiaryDenominatedEquityInstrument	0	USD
CY2020	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-777000	USD
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-3091000	USD
CY2018	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-3774000	USD
CY2020	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-42561000	USD
CY2019	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	40487000	USD
CY2018	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	282732000	USD
CY2020Q4	us-gaap	Equity Securities Without Readily Determinable Fair Value Impairment Loss Cumulative Amount EquitySecuritiesWithoutReadilyDeterminableFairValueImpairmentLossCumulativeAmount	51500000	USD
CY2020	iaci	Impairmentof Notes Receivableand Warrants ImpairmentofNotesReceivableandWarrants	7500000	USD
CY2020	us-gaap	Interest Paid Net InterestPaidNet	6524000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	10042000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	13108000	USD
CY2020	us-gaap	Income Taxes Paid IncomeTaxesPaid	5974000	USD
CY2020Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	-295893000	USD
CY2019	us-gaap	Income Taxes Paid IncomeTaxesPaid	4797000	USD
CY2018	us-gaap	Income Taxes Paid IncomeTaxesPaid	4035000	USD
CY2020	us-gaap	Proceeds From Income Tax Refunds ProceedsFromIncomeTaxRefunds	2010000	USD
CY2019	us-gaap	Proceeds From Income Tax Refunds ProceedsFromIncomeTaxRefunds	3048000	USD
CY2018	us-gaap	Proceeds From Income Tax Refunds ProceedsFromIncomeTaxRefunds	30330000	USD
CY2018	iaci	Fair Value Of Contingent Consideration At Date Of Acquisition FairValueOfContingentConsiderationAtDateOfAcquisition	25500000	USD
CY2020	iaci	Fair Value Of Contingent Consideration At Date Of Acquisition FairValueOfContingentConsiderationAtDateOfAcquisition	0	USD
CY2019	iaci	Fair Value Of Contingent Consideration At Date Of Acquisition FairValueOfContingentConsiderationAtDateOfAcquisition	0	USD
CY2020Q1	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	627216000	USD
CY2020Q2	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	659027000	USD
CY2020Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	713248000	USD
CY2020Q4	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	765045000	USD
CY2020Q1	us-gaap	Cost Of Revenue CostOfRevenue	161120000	USD
CY2020Q2	us-gaap	Cost Of Revenue CostOfRevenue	155846000	USD
CY2020Q3	us-gaap	Cost Of Revenue CostOfRevenue	184888000	USD
CY2020Q4	us-gaap	Cost Of Revenue CostOfRevenue	224289000	USD
CY2020Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	-97445000	USD
CY2020Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	-122229000	USD
CY2020Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	-22096000	USD
CY2020Q1	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	-318521000	USD
CY2020Q2	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	-86004000	USD
CY2020Q3	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	187723000	USD
CY2020Q4	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	506669000	USD
CY2020Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	-12050000	USD
CY2020Q2	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	-8060000	USD
CY2020Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	-1862000	USD
CY2020Q4	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	691000	USD
CY2020Q1	us-gaap	Profit Loss ProfitLoss	-330571000	USD
CY2020Q2	us-gaap	Profit Loss ProfitLoss	-94064000	USD
CY2020Q3	us-gaap	Profit Loss ProfitLoss	185861000	USD
CY2020Q4	us-gaap	Profit Loss ProfitLoss	507360000	USD
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	-328199000	USD
CY2020Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-1.13
CY2020Q2	us-gaap	Net Income Loss NetIncomeLoss	-96117000	USD
CY2020Q1	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	-3.72
CY2020Q2	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	-1.04
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	184917000	USD
CY2020Q4	us-gaap	Net Income Loss NetIncomeLoss	509125000	USD
CY2020Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	2.19
CY2020Q4	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	5.95
CY2020Q1	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	-3.72
CY2020Q2	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	-1.04
CY2020Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	2.06
CY2020Q4	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	5.58
CY2020Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-3.86
CY2020Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-1.13
CY2020Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.17
CY2020Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	5.96
CY2020Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-3.86
CY2020Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.04
CY2020Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	5.59
CY2019Q1	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	597685000	USD
CY2019Q2	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	643027000	USD
CY2019Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	653286000	USD
CY2019Q4	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	615982000	USD
CY2019Q1	us-gaap	Cost Of Revenue CostOfRevenue	122594000	USD
CY2019Q2	us-gaap	Cost Of Revenue CostOfRevenue	133705000	USD
CY2019Q3	us-gaap	Cost Of Revenue CostOfRevenue	139777000	USD
CY2019Q4	us-gaap	Cost Of Revenue CostOfRevenue	135291000	USD
CY2019Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	-15186000	USD
CY2019Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	-1130000	USD
CY2019Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	26706000	USD
CY2019Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	-4656000	USD
CY2019Q1	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	8786000	USD
CY2019Q2	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	30157000	USD
CY2019Q3	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	27703000	USD
CY2019Q4	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	15020000	USD
CY2019Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	-22459000	USD
CY2019Q2	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	-8136000	USD
CY2019Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	-9325000	USD
CY2019Q4	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	-9563000	USD
CY2019Q1	us-gaap	Profit Loss ProfitLoss	-13673000	USD
CY2019Q2	us-gaap	Profit Loss ProfitLoss	22021000	USD
CY2019Q3	us-gaap	Profit Loss ProfitLoss	18378000	USD
CY2019Q4	us-gaap	Profit Loss ProfitLoss	5457000	USD
CY2019Q1	us-gaap	Net Income Loss NetIncomeLoss	-14247000	USD
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	13789000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	16466000	USD
CY2019Q4	us-gaap	Net Income Loss NetIncomeLoss	6887000	USD
CY2019Q1	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.09
CY2019Q2	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.26
CY2019Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.30
CY2019Q4	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.19
CY2019Q1	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.09
CY2019Q2	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.26
CY2019Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.30
CY2019Q4	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.19
CY2019Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.17
CY2019Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.16
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.19
CY2019Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.08
CY2019Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.17
CY2019Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.16
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.19
CY2019Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.08
CY2020Q1	us-gaap	Equity Securities Without Readily Determinable Fair Value Impairment Loss Cumulative Amount EquitySecuritiesWithoutReadilyDeterminableFairValueImpairmentLossCumulativeAmount	51500000	USD
CY2020Q1	iaci	Impairmentof Notes Receivableand Warrants ImpairmentofNotesReceivableandWarrants	7500000	USD

Files In Submission

Name	View Source	Status
0001800227-21-000014-index-headers.html	Edgar Link	pending
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0001800227-21-000014.txt	Edgar Link	pending
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FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
iac-ex231_20201231vimeodo.htm	Edgar Link	pending
iaci-20210601.htm	Edgar Link	pending
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iaci-20210601_def.xml	Edgar Link	unprocessable
iaci-20210601_htm.xml	Edgar Link	completed
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$IAC
IAC Inc. Stock $iac

2020 Q4 Form 8-K Financial Statement

#000180022721000014 Filed on June 01, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$IAC IAC Inc. Stock $iac

2020 Q4 Form 8-K Financial Statement

#000180022721000014 Filed on June 01, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$IAC
IAC Inc. Stock $iac