Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2016	Oct. 28, 2016
Entity Registrant Name	IAC/INTERACTIVECORP
Entity Central Index Key	0000891103
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Sep. 30, 2016
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	Q3
Amendment Flag	false
Common Stock
Entity Common Stock, Shares Outstanding		73,500,407
Class B Convertible Common Stock
Entity Common Stock, Shares Outstanding		5,789,499