CONSOLIDATED STATEMENT OF COMPREHENSIVE OPERATIONS (Unaudited) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Net earnings (loss)		$ 52,340	$ 65,043	$ (130,268)	$ 144,763
Other comprehensive (loss) income, net of tax:
Change in foreign currency translation adjustment	[1]	(4,808)	(10,603)	7,596	(58,604)
Change in unrealized gains and losses of available-for-sale securities (net of tax benefits of $85 and $868 for the three and nine months ended September 30, 2016, respectively, and net of tax benefits of $277 and $95 for the three and nine months ended September 30, 2015, respectively)	[2]	(145)	(3,617)	1,510	632
Total other comprehensive (loss) income, net of tax		(4,953)	(14,220)	9,106	(57,972)
Comprehensive income (loss)		47,387	50,823	(121,162)	86,791
Comprehensive (income) loss attributable to noncontrolling interests		(9,502)	595	(13,881)	7,742
Comprehensive income (loss) attributable to IAC shareholders		$ 37,885	$ 51,418	$ (135,043)	$ 94,533

[1] The nine months ended September 30, 2016 and the three and nine months ended September 30, 2015 include amounts reclassified out of other comprehensive income into earnings. See Note 8 - Accumulated Other Comprehensive Loss for additional information.

[2] The three and nine months ended September 30, 2016 and 2015 include unrealized gains reclassified out of other comprehensive income into earnings. See Note 5 - Marketable Securities and Note 8 - Accumulated Other Comprehensive Loss for additional information.