v2.4.0.6
Document and Entity Information (USD $)
12 Months Ended
Dec. 31, 2011
Jun. 30, 2011
Jan. 27, 2012
Common stock
Jan. 27, 2012
Class B convertible common stock
Entity Registrant Name IAC/INTERACTIVECORP      
Entity Central Index Key 0000891103      
Document Type 8-K      
Document Period End Date Dec. 31, 2011      
Amendment Flag false      
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   $ 3,079,546,221    
Entity Common Stock, Shares Outstanding     75,481,373 5,789,499
Document Fiscal Year Focus 2011      
Document Fiscal Period Focus FY