Document and Entity Information (USD $)	12 Months Ended
	Dec. 31, 2010	Jun. 30, 2010	Jan. 28, 2011 Common Stock	Jan. 28, 2011 Class B Convertible Common Stock
Entity Registrant Name	IAC/INTERACTIVECORP
Entity Central Index Key	0000891103
Document Type	10-K
Document Period End Date	Dec. 31, 2010
Amendment Flag	true
Amendment Description	The Registrant hereby amends in its entirety Item 6. Selected Financial Data, Item 8. Consolidated Financial Statements and Supplementary Data, and Item 9A. Controls and Procedures contained in IAC/InterActiveCorp's (the "Company") Annual Report on Form 10-K for the year ended December 31, 2010 (the "Original Form 10-K"), 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 December 31, 2010, 2009 and 2008 increased non-current deferred income tax liabilities and reduced shareholders' equity by $380.9 million and increased shareholders' equity and reduced deferred income taxes as of December 31, 2007 by $241.9 million. There is also a reclassification of non-current deferred income tax assets of $110.5 million and $102.3 million as of December 31, 2010 and 2009, 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. As a result of the identification of the errors that caused the restatement described above, management reevaluated the effectiveness of the Company's disclosure controls and procedures and internal control over financial reporting as of December 31, 2010 and determined that the control deficiency that caused the misstatement constitutes a material weakness in the operational effectiveness of controls in the area of accounting for deferred income taxes. The Company has developed certain remediation steps to address the material weakness discussed above and to improve its internal control over financial reporting in the area of deferred income taxes. Specifically, we have increased the level of review of work performed by Company personnel and third-party tax professionals in the identification and calculation of deferred income tax liabilities. The Company is in the process of completing its testing of the additional internal control processes outlined above that are designed to remediate this material weakness and expects to conclude that the material weakness has been satisfactorily remediated in its assessment of the effectiveness of the Company's disclosure controls and procedures and internal control over financial reporting as of December 31, 2011. This Amendment reflects the changes described above and one conforming change in Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations - Critical Accounting Policies and Estimates. No other information included in the Original Form 10-K has been amended by this Form 10-K/A to reflect any information or events subsequent to the filing of the Original Form 10-K.
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float		$ 1,932,385,781
Entity Common Stock, Shares Outstanding			84,178,590	4,289,499
Document Fiscal Year Focus	2010
Document Fiscal Period Focus	FY