DOCUMENT AND ENTITY INFORMATION - shares	6 Months Ended
	Jun. 30, 2017	Jul. 28, 2017
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	Jun. 30, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q2
Amendment Flag	false
Common Stock
Entity Common Stock, Shares Outstanding		73,964,732
Class B Convertible Common Stock
Entity Common Stock, Shares Outstanding		5,789,499