CONTINGENCIES (Details)	9 Months Ended
Sep. 30, 2011 lawsuit
CONTINGENCIES
Minimum number of lawsuits that could have material impact on the liquidity, results of operations, or financial condition	1

Represents the minimum number of lawsuits or other contingencies that could have a material impact on the liquidity, results of operations, or financial condition of the entity.

No definition available.

Name:	iaci_LossContingencyMinimumNumberOfLawsuitsThatCouldHaveAMaterialImpact
Namespace Prefix:	iaci_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration