SUPPLEMENTAL CASH FLOW INFORMATION (Details) (USD $)	6 Months Ended	1 Months Ended	12 Months Ended
Jun. 30, 2010	Jun. 30, 2010 Meetic	Dec. 31, 2010 Meetic
Equity method investments
Share of the dividend			$ 11,400,000
Dividend received	$ 8,800,000	$ 8,800,000

This item represents disclosure of the amount of dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporation; these investments are accounted for under the equity method of accounting. This element includes distributions that constitute a return of investment.

No definition available.

Name:	iaci_EquityMethodInvestmentDividendsOrDistributionsInvesting
Namespace Prefix:	iaci_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration