v2.4.0.6

SUPPLEMENTAL CASH FLOW INFORMATION (Details) (USD $) In Thousands, except Share data in Millions, unless otherwise specified | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 28, 2011 | Dec. 31, 2011 | Dec. 31, 2010
Non-Cash Transactions |  |  |
Shares of IAC common stock received in Liberty Exchange | 0.1 |  |
Value of the shares of IAC common stock received in Liberty Exchange | $ 2,900 | $ 2,923 | $ 364,169

X
- Definition Represents common stock shares received in fulfillment of post-closing working capital adjustments. + References No definition available. + Details
Name: | iaci_CommonStockSharesReceivedInFulfillmentOfPostClosingWorkingCapitalAdjustments
Namespace Prefix: | iaci_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition This element represents the value of stock that has been received during the period in the Liberty exchange. + References No definition available. + Details
Name: | iaci_StockExchangeDuringPeriodValue
Namespace Prefix: | iaci_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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