CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net earnings	$ 113,374	$ 409,230	$ 283,725
Other comprehensive (loss) income, net of tax:
Change in foreign currency translation adjustment	(68,844)	(66,874)	7,353
Change in unrealized gains and losses of available-for-sale securities (net of tax provision of $576 in 2015 and tax benefits of $1,852 and $3,050 in 2014 and 2013, respectively)	3,140	(8,591)	15,442
Total other comprehensive (loss) income	(65,704)	(75,465)	22,795
Comprehensive income	47,670	333,765	306,520
Comprehensive loss (income) attributable to noncontrolling interests	7,399	6,454	(1,613)
Comprehensive income attributable to IAC shareholders	$ 55,069	$ 340,219	$ 304,907