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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 3) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Advertising Costs (excluding Amortization of Non-Cash Marketing)      
Advertising expense $ 971,800,000us-gaap_AdvertisingExpense $ 824,100,000us-gaap_AdvertisingExpense $ 774,100,000us-gaap_AdvertisingExpense
Capitalized access fees, estimated useful lives 18 months    
Income Tax Uncertainties [Abstract]      
Tax Benefits Recognition Basis for Uncertain Tax Position Likelihood Realization Greater than Percentage 50.00%iaci_TaxBenefitsRecognitionBasisForUncertainTaxPositionLikelihoodRealizationGreaterThanPercentage    
Redeemable Noncontrolling Interest      
Number of years in which put and call arrangements become exercisable 4 years    
Number of put and call arrangements that became exercisable 0iaci_NumberofPutandCallArrangementsExercised 2iaci_NumberofPutandCallArrangementsExercised 0iaci_NumberofPutandCallArrangementsExercised
Adjustment to increase redeemable noncontrolling interests to fair value (27,750,000)us-gaap_MinorityInterestChangeInRedemptionValue (40,638,000)us-gaap_MinorityInterestChangeInRedemptionValue (4,275,000)us-gaap_MinorityInterestChangeInRedemptionValue
Minimum      
Goodwill and Indefinite-Lived Intangible Assets      
Royalty rates used for impairment assessment of indefinite-lived intangible assets (as a percent) 1.00%iaci_ImpairmentAssessmentofIndefiniteLivedIntangibleAssetsFairValueInputsRoyaltyRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
1.00%iaci_ImpairmentAssessmentofIndefiniteLivedIntangibleAssetsFairValueInputsRoyaltyRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Maximum      
Goodwill and Indefinite-Lived Intangible Assets      
Royalty rates used for impairment assessment of indefinite-lived intangible assets (as a percent) 9.00%iaci_ImpairmentAssessmentofIndefiniteLivedIntangibleAssetsFairValueInputsRoyaltyRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
9.00%iaci_ImpairmentAssessmentofIndefiniteLivedIntangibleAssetsFairValueInputsRoyaltyRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
Redeemable Noncontrolling Interest      
Redeemable Noncontrolling Interest      
Adjustment to increase redeemable noncontrolling interests to fair value 27,800,000us-gaap_MinorityInterestChangeInRedemptionValue
/ us-gaap_StatementEquityComponentsAxis
= iaci_RedeemableNoncontrollingInterestMember
40,600,000us-gaap_MinorityInterestChangeInRedemptionValue
/ us-gaap_StatementEquityComponentsAxis
= iaci_RedeemableNoncontrollingInterestMember
4,300,000us-gaap_MinorityInterestChangeInRedemptionValue
/ us-gaap_StatementEquityComponentsAxis
= iaci_RedeemableNoncontrollingInterestMember
Search & Applications      
Goodwill and Indefinite-Lived Intangible Assets      
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount 15.00%us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount
/ us-gaap_StatementBusinessSegmentsAxis
= iaci_SearchAndApplicationsMember
   
Reporting Unit Hypothetical Percentage Lower of Fair Value In Excess of Carrying Amount 20.00%iaci_HypotheticalPercentageReductionInFairValueOfReportingUnit
/ us-gaap_StatementBusinessSegmentsAxis
= iaci_SearchAndApplicationsMember
   
Reporting Unit Hypothetical Amount Of Fair Value In Excess Of Carrying Amount $ 100,000,000iaci_ReportingUnitHypotheticalAmountOfFairValueInExcessOfCarryingAmount
/ us-gaap_StatementBusinessSegmentsAxis
= iaci_SearchAndApplicationsMember
   
Goodwill [Member] | Minimum      
Goodwill and Indefinite-Lived Intangible Assets      
Fair Value, Discount Rate 13.00%us-gaap_FairValueInputsDiscountRate
/ iaci_FairValueByAssetAndLiabilityClassAxis
= us-gaap_GoodwillMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
13.00%us-gaap_FairValueInputsDiscountRate
/ iaci_FairValueByAssetAndLiabilityClassAxis
= us-gaap_GoodwillMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Goodwill [Member] | Maximum      
Goodwill and Indefinite-Lived Intangible Assets      
Fair Value, Discount Rate 19.00%us-gaap_FairValueInputsDiscountRate
/ iaci_FairValueByAssetAndLiabilityClassAxis
= us-gaap_GoodwillMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
25.00%us-gaap_FairValueInputsDiscountRate
/ iaci_FairValueByAssetAndLiabilityClassAxis
= us-gaap_GoodwillMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
Indefinite-lived Intangible Assets [Member] | Minimum      
Goodwill and Indefinite-Lived Intangible Assets      
Fair Value, Discount Rate 10.00%us-gaap_FairValueInputsDiscountRate
/ iaci_FairValueByAssetAndLiabilityClassAxis
= us-gaap_IndefinitelivedIntangibleAssetsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
10.00%us-gaap_FairValueInputsDiscountRate
/ iaci_FairValueByAssetAndLiabilityClassAxis
= us-gaap_IndefinitelivedIntangibleAssetsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Indefinite-lived Intangible Assets [Member] | Maximum      
Goodwill and Indefinite-Lived Intangible Assets      
Fair Value, Discount Rate 20.00%us-gaap_FairValueInputsDiscountRate
/ iaci_FairValueByAssetAndLiabilityClassAxis
= us-gaap_IndefinitelivedIntangibleAssetsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
18.00%us-gaap_FairValueInputsDiscountRate
/ iaci_FairValueByAssetAndLiabilityClassAxis
= us-gaap_IndefinitelivedIntangibleAssetsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember