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BENEFIT PLANS (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]      
Employee contribution limit per calendar year (as a percent of pre-tax earnings) 50.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent 50.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent 50.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Employer contribution limit per calendar year (as a percent of compensation) 3.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent 3.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent 3.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
UNITED STATES      
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]      
Defined Benefit Plan, Contributions by Employer 7.5us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution
/ us-gaap_StatementGeographicalAxis
= country_US
6.5us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution
/ us-gaap_StatementGeographicalAxis
= country_US
6.5us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution
/ us-gaap_StatementGeographicalAxis
= country_US
All Other Countries [Member]      
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]      
Defined Benefit Plan, Contributions by Employer 2.5us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution
/ us-gaap_StatementGeographicalAxis
= iaci_AllOtherCountriesMember
2.9us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution
/ us-gaap_StatementGeographicalAxis
= iaci_AllOtherCountriesMember
2.3us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution
/ us-gaap_StatementGeographicalAxis
= iaci_AllOtherCountriesMember