v2.4.0.8

QUARTERLY RESULTS (UNAUDITED) (Details2) (The Newsweek/Daily Beast Company (United States), USD $) In Millions, unless otherwise specified | 3 Months Ended
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Jun. 30, 2012
The Newsweek/Daily Beast Company (United States) |
Schedule of Equity Method Investments [Line Items] |
Mark To Market Adjustment For Previously Held Equity Method Investment After-Tax | $ 16.2

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- Definition This item represents the after-tax non cash charge for the mark-to-market adjustment to fair value of a previously held equity method investment prior to it being consolidated. + References No definition available. + Details
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Namespace Prefix: | iaci_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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