CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Statement of Other Comprehensive Income [Abstract]
Net earnings	$ 57,472	$ 43,460	$ 109,237	$ 78,297
Other comprehensive (loss) income, net of tax:
Change in foreign currency translation adjustment	(4,598)	(26,634)	(13,021)	(19,549)
Change in net unrealized gains (losses) on available-for-sale securities (net of tax provision of $740 and tax benefit of $84 for the three and six months ended June 30, 2013, respectively, and tax benefit of $5,475 and tax provision of $7,104 for the three and six months ended June 30, 2012, respectively)	17,187	(11,281)	12,211	13,443
Net current period other comprehensive income (loss)	12,589	(37,915)	(810)	(6,106)
Comprehensive income	70,061	5,545	108,427	72,191
Comprehensive loss attributable to noncontrolling interests	138	3,774	3,482	2,502
Comprehensive income attributable to IAC shareholders	$ 70,199	$ 9,319	$ 111,909	$ 74,693