v2.4.0.8

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $) In Millions, unless otherwise specified			12 Months Ended
	Dec. 31, 2013 Match	Dec. 31, 2012 Match	Dec. 31, 2013 Match Minimum	Dec. 31, 2013 Match Maximum	Dec. 31, 2013 Media Minimum	Dec. 31, 2013 Media Maximum	Dec. 31, 2013 HomeAdvisor	Dec. 31, 2012 HomeAdvisor
Deferred revenue
Revenue recognition period (in months)			1 month	6 months	1 month	1 year
Deferred revenue	$ 116.5	$ 103.9					$ 4.0	$ 3.0

X

- Definition

Represents the period over which deferred revenue is recognized.

+ References

No definition available.

+ Details

Name:	iaci_DeferredRevenueRevenueRecognitionPeriod
Namespace Prefix:	iaci_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 13

-Section A



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 605

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 13.A.4(a).Q1 Response)

-URI http://asc.fasb.org/extlink&oid=27012821&loc=d3e214044-122780

+ Details

Name:	us-gaap_DeferredRevenue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_DeferredRevenueArrangementLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration