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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 3) (USD $)
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12 Months Ended |
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| Advertising Costs (excluding Amortization of Non-Cash Marketing) |
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| 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 |
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| Income Tax Uncertainties [Abstract] |
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| Tax Benefits Recognition Basis for Uncertain Tax Position Likelihood Realization Greater than Percentage |
50.00%iaci_TaxBenefitsRecognitionBasisForUncertainTaxPositionLikelihoodRealizationGreaterThanPercentage |
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| Redeemable Noncontrolling Interest |
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| Number of years in which put and call arrangements become exercisable |
4 years |
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| 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 |
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| Goodwill and Indefinite-Lived Intangible Assets |
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| 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 |
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| Maximum |
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| Goodwill and Indefinite-Lived Intangible Assets |
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| 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 |
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| Redeemable Noncontrolling Interest |
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| Redeemable Noncontrolling Interest |
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| 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 |
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| Goodwill and Indefinite-Lived Intangible Assets |
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| Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount |
15.00%us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount / us-gaap_StatementBusinessSegmentsAxis = iaci_SearchAndApplicationsMember |
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| Reporting Unit Hypothetical Percentage Lower of Fair Value In Excess of Carrying Amount |
20.00%iaci_HypotheticalPercentageReductionInFairValueOfReportingUnit / us-gaap_StatementBusinessSegmentsAxis = iaci_SearchAndApplicationsMember |
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| Reporting Unit Hypothetical Amount Of Fair Value In Excess Of Carrying Amount |
$ 100,000,000iaci_ReportingUnitHypotheticalAmountOfFairValueInExcessOfCarryingAmount / us-gaap_StatementBusinessSegmentsAxis = iaci_SearchAndApplicationsMember |
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| Goodwill [Member] | Minimum |
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| Goodwill and Indefinite-Lived Intangible Assets |
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| 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 |
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| Goodwill [Member] | Maximum |
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| Goodwill and Indefinite-Lived Intangible Assets |
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| 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 |
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| Indefinite-lived Intangible Assets [Member] | Minimum |
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| Goodwill and Indefinite-Lived Intangible Assets |
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| 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 |
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| Indefinite-lived Intangible Assets [Member] | Maximum |
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| Goodwill and Indefinite-Lived Intangible Assets |
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| 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 |
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