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GUARANTOR AND NONGUARANTOR FINANCIAL INFORMATION (Details 3) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Condensed Cash Flow Statements, Captions [Line Items]      
Net cash provided by operating activities attributable to continuing operations $ 424,048us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations $ 410,961us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations $ 354,527us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Acquisitions, net of cash acquired (259,391)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired (40,434)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired (400,254)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Capital expenditures (57,233)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (80,311)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (51,201)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Proceeds from maturities and sales of marketable debt securities 21,644us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities 12,502us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities 195,501us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities
Purchases of marketable debt securities (175,826)us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt   (53,952)us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt
Proceeds from sales of long-term investments, assets and a business 58,388us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities 83,091us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities 14,616us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
Purchases of long-term investments (24,334)us-gaap_PaymentsToAcquireLongtermInvestments (51,080)us-gaap_PaymentsToAcquireLongtermInvestments (36,094)us-gaap_PaymentsToAcquireLongtermInvestments
Other, net (3,042)us-gaap_PaymentsForProceedsFromOtherInvestingActivities (3,529)us-gaap_PaymentsForProceedsFromOtherInvestingActivities (9,923)us-gaap_PaymentsForProceedsFromOtherInvestingActivities
Net cash used in investing activities attributable to continuing operations (439,794)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (79,761)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (341,307)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Proceeds from issuance of long-term debt   500,000us-gaap_ProceedsFromIssuanceOfDebt 500,000us-gaap_ProceedsFromIssuanceOfDebt
Principal payments on long-term debt 0us-gaap_RepaymentsOfLongTermDebt (15,844)us-gaap_RepaymentsOfLongTermDebt 0us-gaap_RepaymentsOfLongTermDebt
Purchase of treasury stock   (264,214)us-gaap_PaymentsForRepurchaseOfCommonStock (691,830)us-gaap_PaymentsForRepurchaseOfCommonStock
Dividends (97,338)us-gaap_PaymentsOfDividendsCommonStock (79,189)us-gaap_PaymentsOfDividendsCommonStock (68,163)us-gaap_PaymentsOfDividendsCommonStock
Proceeds from Issuance or Sale of Equity 1,609us-gaap_ProceedsFromIssuanceOrSaleOfEquity (5,077)us-gaap_ProceedsFromIssuanceOrSaleOfEquity 262,841us-gaap_ProceedsFromIssuanceOrSaleOfEquity
Excess tax benefits from stock-based awards 44,957us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 32,891us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 57,101us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Purchase of noncontrolling Interests (33,165)us-gaap_PaymentsToMinorityShareholders (67,947)us-gaap_PaymentsToMinorityShareholders (4,891)us-gaap_PaymentsToMinorityShareholders
Funds returned from (transferred to) escrow for Meetic tender offer 12,354iaci_IncreaseDecreaseInRestrictedCashFinancing (71,512)iaci_IncreaseDecreaseInRestrictedCashFinancing 0iaci_IncreaseDecreaseInRestrictedCashFinancing
Acquisition-related contingent consideration payments (8,109)iaci_BusinessCombinationContingentConsiderationPaymentFinancing (256)iaci_BusinessCombinationContingentConsiderationPaymentFinancing (10,781)iaci_BusinessCombinationContingentConsiderationPaymentFinancing
Debt issuance Costs (383)us-gaap_PaymentsOfDebtIssuanceCosts (7,399)us-gaap_PaymentsOfDebtIssuanceCosts (11,001)us-gaap_PaymentsOfDebtIssuanceCosts
Other, net (905)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities (3,787)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities 244us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
Net cash (used in) provided by financing activities attributable to continuing operations (80,980)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations 17,666us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations 33,520us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Total cash (used in) provided by continuing operations (96,726)us-gaap_NetCashProvidedByUsedInContinuingOperations 348,866us-gaap_NetCashProvidedByUsedInContinuingOperations 46,740us-gaap_NetCashProvidedByUsedInContinuingOperations
Total cash used in discontinued operations (145)us-gaap_NetCashProvidedByUsedInDiscontinuedOperations (1,877)us-gaap_NetCashProvidedByUsedInDiscontinuedOperations (3,472)us-gaap_NetCashProvidedByUsedInDiscontinuedOperations
Effect of exchange rate changes on cash and cash equivalents (13,168)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents 3,478us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents 2,556us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Net (decrease) increase in cash and cash equivalents (110,039)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 350,467us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 45,824us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of period 1,100,444us-gaap_CashAndCashEquivalentsAtCarryingValue 749,977us-gaap_CashAndCashEquivalentsAtCarryingValue 704,153us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of period 990,405us-gaap_CashAndCashEquivalentsAtCarryingValue 1,100,444us-gaap_CashAndCashEquivalentsAtCarryingValue 749,977us-gaap_CashAndCashEquivalentsAtCarryingValue
IAC      
Condensed Cash Flow Statements, Captions [Line Items]      
Net cash provided by operating activities attributable to continuing operations (114,773)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(95,081)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(116,353)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Acquisitions, net of cash acquired 0us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(35,159)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Capital expenditures (1,843)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(1,387)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(3,969)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Proceeds from maturities and sales of marketable debt securities 21,644us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
12,502us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
195,501us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Purchases of marketable debt securities (175,826)us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
  (53,952)us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Proceeds from sales of long-term investments, assets and a business 0us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
7,839us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
14,194us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Purchases of long-term investments (4,800)us-gaap_PaymentsToAcquireLongtermInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(17,814)us-gaap_PaymentsToAcquireLongtermInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(27,187)us-gaap_PaymentsToAcquireLongtermInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Other, net (2,000)us-gaap_PaymentsForProceedsFromOtherInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_PaymentsForProceedsFromOtherInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(351)us-gaap_PaymentsForProceedsFromOtherInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net cash used in investing activities attributable to continuing operations (162,825)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,140us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
89,077us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Proceeds from issuance of long-term debt   500,000us-gaap_ProceedsFromIssuanceOfDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
500,000us-gaap_ProceedsFromIssuanceOfDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Principal payments on long-term debt   (15,844)us-gaap_RepaymentsOfLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Purchase of treasury stock   (264,214)us-gaap_PaymentsForRepurchaseOfCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(691,830)us-gaap_PaymentsForRepurchaseOfCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Dividends (97,338)us-gaap_PaymentsOfDividendsCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(79,189)us-gaap_PaymentsOfDividendsCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(68,163)us-gaap_PaymentsOfDividendsCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Proceeds from Issuance or Sale of Equity 1,609us-gaap_ProceedsFromIssuanceOrSaleOfEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(5,077)us-gaap_ProceedsFromIssuanceOrSaleOfEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
262,841us-gaap_ProceedsFromIssuanceOrSaleOfEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Excess tax benefits from stock-based awards 34,214us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
32,081us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
52,209us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Purchase of noncontrolling Interests 0us-gaap_PaymentsToMinorityShareholders
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_PaymentsToMinorityShareholders
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(1,936)us-gaap_PaymentsToMinorityShareholders
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Funds returned from (transferred to) escrow for Meetic tender offer 0iaci_IncreaseDecreaseInRestrictedCashFinancing
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0iaci_IncreaseDecreaseInRestrictedCashFinancing
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Acquisition-related contingent consideration payments 0iaci_BusinessCombinationContingentConsiderationPaymentFinancing
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0iaci_BusinessCombinationContingentConsiderationPaymentFinancing
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0iaci_BusinessCombinationContingentConsiderationPaymentFinancing
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Debt issuance Costs (383)us-gaap_PaymentsOfDebtIssuanceCosts
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(7,399)us-gaap_PaymentsOfDebtIssuanceCosts
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(11,001)us-gaap_PaymentsOfDebtIssuanceCosts
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Intercompany 323,666iaci_IntercompanyFinancingActivites
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
216,359iaci_IntercompanyFinancingActivites
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(55,020)iaci_IntercompanyFinancingActivites
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Other, net 0us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Net cash (used in) provided by financing activities attributable to continuing operations 261,768us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
376,717us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(12,900)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Total cash (used in) provided by continuing operations (15,830)us-gaap_NetCashProvidedByUsedInContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
282,776us-gaap_NetCashProvidedByUsedInContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(40,176)us-gaap_NetCashProvidedByUsedInContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Total cash used in discontinued operations (116)us-gaap_NetCashProvidedByUsedInDiscontinuedOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(1,829)us-gaap_NetCashProvidedByUsedInDiscontinuedOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(3,971)us-gaap_NetCashProvidedByUsedInDiscontinuedOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Effect of exchange rate changes on cash and cash equivalents 0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net (decrease) increase in cash and cash equivalents (15,946)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
280,947us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(44,147)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Cash and cash equivalents at beginning of period 782,022us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
501,075us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
545,222us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Cash and cash equivalents at end of period 766,076us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
782,022us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
501,075us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Guarantor Subsidiaries      
Condensed Cash Flow Statements, Captions [Line Items]      
Net cash provided by operating activities attributable to continuing operations 543,087us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
537,116us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
453,692us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Acquisitions, net of cash acquired (191,238)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(6,382)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(331,182)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Capital expenditures (40,422)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(63,931)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(29,550)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Proceeds from maturities and sales of marketable debt securities 0us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Purchases of marketable debt securities 0us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
  0us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Proceeds from sales of long-term investments, assets and a business 0us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
50,850us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
272us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Purchases of long-term investments (7,043)us-gaap_PaymentsToAcquireLongtermInvestments
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_PaymentsToAcquireLongtermInvestments
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(724)us-gaap_PaymentsToAcquireLongtermInvestments
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Other, net 11us-gaap_PaymentsForProceedsFromOtherInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(1,725)us-gaap_PaymentsForProceedsFromOtherInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(155)us-gaap_PaymentsForProceedsFromOtherInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Net cash used in investing activities attributable to continuing operations (238,692)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(21,188)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(361,339)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Principal payments on long-term debt   0us-gaap_RepaymentsOfLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
 
Dividends 0us-gaap_PaymentsOfDividendsCommonStock
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Proceeds from Issuance or Sale of Equity 0us-gaap_ProceedsFromIssuanceOrSaleOfEquity
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Excess tax benefits from stock-based awards 0us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
  4,892us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Purchase of noncontrolling Interests (30,000)us-gaap_PaymentsToMinorityShareholders
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_PaymentsToMinorityShareholders
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_PaymentsToMinorityShareholders
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Funds returned from (transferred to) escrow for Meetic tender offer 0iaci_IncreaseDecreaseInRestrictedCashFinancing
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0iaci_IncreaseDecreaseInRestrictedCashFinancing
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
 
Acquisition-related contingent consideration payments (736)iaci_BusinessCombinationContingentConsiderationPaymentFinancing
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(256)iaci_BusinessCombinationContingentConsiderationPaymentFinancing
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(10,781)iaci_BusinessCombinationContingentConsiderationPaymentFinancing
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Debt issuance Costs 0us-gaap_PaymentsOfDebtIssuanceCosts
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_PaymentsOfDebtIssuanceCosts
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_PaymentsOfDebtIssuanceCosts
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Intercompany (271,309)iaci_IntercompanyFinancingActivites
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(514,464)iaci_IntercompanyFinancingActivites
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(86,446)iaci_IntercompanyFinancingActivites
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Other, net (1,365)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(1,225)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
 
Net cash (used in) provided by financing activities attributable to continuing operations (303,410)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(515,945)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(92,335)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Total cash (used in) provided by continuing operations 985us-gaap_NetCashProvidedByUsedInContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(17)us-gaap_NetCashProvidedByUsedInContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
18us-gaap_NetCashProvidedByUsedInContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Total cash used in discontinued operations 0us-gaap_NetCashProvidedByUsedInDiscontinuedOperations
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Effect of exchange rate changes on cash and cash equivalents 36us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
17us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(18)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Net (decrease) increase in cash and cash equivalents 1,021us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Cash and cash equivalents at beginning of period 0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Cash and cash equivalents at end of period 1,021us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Non-Guarantor Subsidiaries      
Condensed Cash Flow Statements, Captions [Line Items]      
Net cash provided by operating activities attributable to continuing operations (4,266)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(31,074)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
17,188us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Acquisitions, net of cash acquired (68,153)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(34,052)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(33,913)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Capital expenditures (14,968)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(14,993)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(17,682)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Proceeds from maturities and sales of marketable debt securities 0us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
0us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
0us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Purchases of marketable debt securities 0us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
  0us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Proceeds from sales of long-term investments, assets and a business 58,388us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
24,402us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
150us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Purchases of long-term investments (12,491)us-gaap_PaymentsToAcquireLongtermInvestments
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(33,266)us-gaap_PaymentsToAcquireLongtermInvestments
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(8,183)us-gaap_PaymentsToAcquireLongtermInvestments
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Other, net (1,053)us-gaap_PaymentsForProceedsFromOtherInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(1,804)us-gaap_PaymentsForProceedsFromOtherInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(9,417)us-gaap_PaymentsForProceedsFromOtherInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Net cash used in investing activities attributable to continuing operations (38,277)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(59,713)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(69,045)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Principal payments on long-term debt   0us-gaap_RepaymentsOfLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
 
Dividends 0us-gaap_PaymentsOfDividendsCommonStock
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Proceeds from Issuance or Sale of Equity 0us-gaap_ProceedsFromIssuanceOrSaleOfEquity
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Excess tax benefits from stock-based awards 10,743us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
810us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
 
Purchase of noncontrolling Interests (3,165)us-gaap_PaymentsToMinorityShareholders
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(67,947)us-gaap_PaymentsToMinorityShareholders
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(2,955)us-gaap_PaymentsToMinorityShareholders
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Funds returned from (transferred to) escrow for Meetic tender offer 12,354iaci_IncreaseDecreaseInRestrictedCashFinancing
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(71,512)iaci_IncreaseDecreaseInRestrictedCashFinancing
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
 
Acquisition-related contingent consideration payments (7,373)iaci_BusinessCombinationContingentConsiderationPaymentFinancing
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
0iaci_BusinessCombinationContingentConsiderationPaymentFinancing
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
0iaci_BusinessCombinationContingentConsiderationPaymentFinancing
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Debt issuance Costs 0us-gaap_PaymentsOfDebtIssuanceCosts
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
0us-gaap_PaymentsOfDebtIssuanceCosts
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
0us-gaap_PaymentsOfDebtIssuanceCosts
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Intercompany (52,357)iaci_IntercompanyFinancingActivites
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
298,105iaci_IntercompanyFinancingActivites
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
141,466iaci_IntercompanyFinancingActivites
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Other, net 460us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(2,562)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
244us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Net cash (used in) provided by financing activities attributable to continuing operations (39,338)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
156,894us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
138,755us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Total cash (used in) provided by continuing operations (81,881)us-gaap_NetCashProvidedByUsedInContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
66,107us-gaap_NetCashProvidedByUsedInContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
86,898us-gaap_NetCashProvidedByUsedInContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Total cash used in discontinued operations (29)us-gaap_NetCashProvidedByUsedInDiscontinuedOperations
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(48)us-gaap_NetCashProvidedByUsedInDiscontinuedOperations
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
499us-gaap_NetCashProvidedByUsedInDiscontinuedOperations
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Effect of exchange rate changes on cash and cash equivalents (13,204)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
3,461us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
2,574us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Net (decrease) increase in cash and cash equivalents (95,114)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
69,520us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
89,971us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Cash and cash equivalents at beginning of period 318,422us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
248,902us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
158,931us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Cash and cash equivalents at end of period 223,308us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
318,422us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
248,902us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
IAC Consolidated      
Condensed Cash Flow Statements, Captions [Line Items]      
Net cash provided by operating activities attributable to continuing operations 424,048us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
410,961us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
354,527us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
Acquisitions, net of cash acquired (259,391)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
(40,434)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
(400,254)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
Capital expenditures (57,233)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
(80,311)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
(51,201)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
Proceeds from maturities and sales of marketable debt securities 21,644us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
12,502us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
195,501us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
Purchases of marketable debt securities (175,826)us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
  (53,952)us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
Proceeds from sales of long-term investments, assets and a business 58,388us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
83,091us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
14,616us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
Purchases of long-term investments (24,334)us-gaap_PaymentsToAcquireLongtermInvestments
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
(51,080)us-gaap_PaymentsToAcquireLongtermInvestments
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
(36,094)us-gaap_PaymentsToAcquireLongtermInvestments
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
Other, net (3,042)us-gaap_PaymentsForProceedsFromOtherInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
(3,529)us-gaap_PaymentsForProceedsFromOtherInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
(9,923)us-gaap_PaymentsForProceedsFromOtherInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
Net cash used in investing activities attributable to continuing operations (439,794)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
(79,761)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
(341,307)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
Proceeds from issuance of long-term debt   500,000us-gaap_ProceedsFromIssuanceOfDebt
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
500,000us-gaap_ProceedsFromIssuanceOfDebt
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
Principal payments on long-term debt   (15,844)us-gaap_RepaymentsOfLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
 
Purchase of treasury stock   (264,214)us-gaap_PaymentsForRepurchaseOfCommonStock
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
(691,830)us-gaap_PaymentsForRepurchaseOfCommonStock
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
Dividends (97,338)us-gaap_PaymentsOfDividendsCommonStock
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
(79,189)us-gaap_PaymentsOfDividendsCommonStock
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
(68,163)us-gaap_PaymentsOfDividendsCommonStock
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
Proceeds from Issuance or Sale of Equity 1,609us-gaap_ProceedsFromIssuanceOrSaleOfEquity
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
(5,077)us-gaap_ProceedsFromIssuanceOrSaleOfEquity
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
262,841us-gaap_ProceedsFromIssuanceOrSaleOfEquity
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
Excess tax benefits from stock-based awards 44,957us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
32,891us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
57,101us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
Purchase of noncontrolling Interests (33,165)us-gaap_PaymentsToMinorityShareholders
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
(67,947)us-gaap_PaymentsToMinorityShareholders
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
(4,891)us-gaap_PaymentsToMinorityShareholders
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
Funds returned from (transferred to) escrow for Meetic tender offer 12,354iaci_IncreaseDecreaseInRestrictedCashFinancing
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
(71,512)iaci_IncreaseDecreaseInRestrictedCashFinancing
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
 
Acquisition-related contingent consideration payments (8,109)iaci_BusinessCombinationContingentConsiderationPaymentFinancing
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
(256)iaci_BusinessCombinationContingentConsiderationPaymentFinancing
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
(10,781)iaci_BusinessCombinationContingentConsiderationPaymentFinancing
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
Debt issuance Costs (383)us-gaap_PaymentsOfDebtIssuanceCosts
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
(7,399)us-gaap_PaymentsOfDebtIssuanceCosts
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
(11,001)us-gaap_PaymentsOfDebtIssuanceCosts
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
Intercompany 0iaci_IntercompanyFinancingActivites
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
0iaci_IntercompanyFinancingActivites
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
0iaci_IntercompanyFinancingActivites
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
Other, net (905)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
(3,787)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
244us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
Net cash (used in) provided by financing activities attributable to continuing operations (80,980)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
17,666us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
33,520us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
Total cash (used in) provided by continuing operations (96,726)us-gaap_NetCashProvidedByUsedInContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
348,866us-gaap_NetCashProvidedByUsedInContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
46,740us-gaap_NetCashProvidedByUsedInContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
Total cash used in discontinued operations (145)us-gaap_NetCashProvidedByUsedInDiscontinuedOperations
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
(1,877)us-gaap_NetCashProvidedByUsedInDiscontinuedOperations
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
(3,472)us-gaap_NetCashProvidedByUsedInDiscontinuedOperations
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
Effect of exchange rate changes on cash and cash equivalents (13,168)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
3,478us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
2,556us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
Net (decrease) increase in cash and cash equivalents (110,039)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
350,467us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
45,824us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
Cash and cash equivalents at beginning of period 1,100,444us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
749,977us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
704,153us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
Cash and cash equivalents at end of period $ 990,405us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
$ 1,100,444us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
$ 749,977us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember