CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Statement of Comprehensive Income [Abstract]
Net earnings	$ 33,491	$ 51,765
Other comprehensive income (loss), net of tax:
Change in foreign currency translation adjustment	5,377	(8,423)
Change in net unrealized losses on available-for-sale securities (net of tax benefits of $573 in 2014 and $824 in 2013)	(111)	(4,976)
Net current period other comprehensive income	5,266	(13,399)
Comprehensive income	38,757	38,366
Comprehensive loss attributable to noncontrolling interests	2,477	3,344
Comprehensive income attributable to IAC shareholders	$ 41,234	$ 41,710