Document and Entity Information (USD $)	9 Months Ended
	Sep. 30, 2013	Oct. 25, 2013
Entity Registrant Name	IAC/INTERACTIVECORP
Entity Central Index Key	0000891103
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Public Float		$ 4,316,591,180
Document Type	10-Q
Document Period End Date	Sep. 30, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q3
Amendment Flag	false
Common Stock
Entity Common Stock, Shares Outstanding		77,504,390
Class B Convertible Common Stock
Entity Common Stock, Shares Outstanding		5,789,499