RELATED PARTY TRANSACTIONS (Details)	Dec. 31, 2011
RELATED PARTY TRANSACTIONS
Ownership interest held by each of the Company and Expedia in aircraft (as a percent)	50.00%
Ownership interest held by each of the Company and Expedia in an entity employing aircraft flight crew (as a percent)	50.00%

Represents the percentage of ownership interest in another entity employing aircraft flight crew that is held by the reporting entity and a similar percentage of ownership that is held by the related party.

No definition available.

Name:	iaci_PercentageOfOwnershipInterestHeldEachByEntityAndByRelatedPartyInAnotherEntityEmployingFlightCrew
Namespace Prefix:	iaci_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant