Document and Entity Information (USD $)	6 Months Ended
	Jun. 30, 2011	Jul. 22, 2011
Entity Registrant Name	IAC/INTERACTIVECORP
Entity Central Index Key	0000891103
Document Type	10-Q
Document Period End Date	Jun. 30, 2011
Amendment Flag	true
Amendment Description	The Registrant hereby amends in its entirety Item 1. Consolidated Financial Statements and Item 4. Controls and Procedures contained in IAC/InterActiveCorp's (the "Company") Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2011 (the "Original Form 10-Q"), as described below. On January 27, 2012, management and the Audit Committee (the "Committee") of the Board of Directors of the Company concluded that an error existed in the Company's previously issued financial statements relating to accounting for a deferred income tax liability that requires correction. During 2011, the Company undertook an analysis of the tax basis of certain businesses in connection with a review of its organizational structure. As a result of this review, the Company determined that the original deferred income tax provision recorded in 2002 in connection with a series of transactions, which included the exchange of certain of the Company's media businesses for certain other assets, was incorrectly calculated and incorrectly allocated to a former subsidiary. The correction of these errors as of June 30, 2011 and December 31, 2010 increased non-current deferred income tax liabilities and reduced shareholders' equity by $380.9 million. There is also a reclassification of non-current deferred income tax assets of $79.4 million and $110.5 million as of June 30, 2011 and December 31, 2010, respectively, which is required because non-current deferred income tax assets and liabilities of the same tax jurisdiction must be presented on the consolidated balance sheet on a net basis. Correcting these errors has no impact on the Company's consolidated statement of operations or consolidated statement of cash flows. This Amendment reflects the changes described above. No other information included in the Original Form 10-Q has been amended by this Form 10-Q/A to reflect any information or events subsequent to the filing of the Original Form 10-Q.
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float		$ 2,985,357,951
Document Fiscal Year Focus	2011
Document Fiscal Period Focus	Q2
Common stock
Entity Common Stock, Shares Outstanding		79,174,454
Class B convertible common stock
Entity Common Stock, Shares Outstanding		5,789,499