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SEGMENT INFORMATION (Details 2) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Revenue and long-lived assets by geography      
Revenue $ 772,512us-gaap_Revenues $ 740,247us-gaap_Revenues  
Long-lived assets (excluding goodwill and intangible assets) 297,956us-gaap_PropertyPlantAndEquipmentNet   302,459us-gaap_PropertyPlantAndEquipmentNet
United States      
Revenue and long-lived assets by geography      
Revenue 570,013us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_US		 504,403us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_US		  
Long-lived assets (excluding goodwill and intangible assets) 279,606us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_US		   281,879us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_US
All Other Countries [Member]      
Revenue and long-lived assets by geography      
Revenue 202,499us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= iaci_AllOtherCountriesMember		 235,844us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= iaci_AllOtherCountriesMember		  
Long-lived assets (excluding goodwill and intangible assets) $ 18,350us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= iaci_AllOtherCountriesMember		   $ 20,580us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= iaci_AllOtherCountriesMember