v2.4.0.8

CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (Parenthetical) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Statement of Comprehensive Income [Abstract] |  |  |
Change in net unrealized gains (losses) on available-for-sale securities, net of tax (provision) benefit | $ 3,050 | $ 3,981 | $ (5,460)

X
- Definition Available for sale securities change in net unrealized holding gain loss, tax + References No definition available. + Details
Name: | iaci_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLossTax
Namespace Prefix: | iaci_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration