CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Statement of Comprehensive Income [Abstract]
Net (loss) earnings	$ (18,863)	$ 57,472	$ 14,628	$ 109,237
Other comprehensive (loss) income, net of tax:
Change in foreign currency translation adjustment	(187)	(4,598)	5,190	(13,021)
Change in net unrealized (losses) gains on available-for-sale securities (net of tax benefits of $865 and $1,438 for the three and six months ended June 30, 2014, respectively, and tax provision of $740 and tax benefit of $84 for the three and six months ended June 30, 2013, respectively)	(2,139)	17,187	(2,250)	12,211
Net current period other comprehensive loss	(2,326)	12,589	2,940	(810)
Comprehensive (loss) income	(21,189)	70,061	17,568	108,427
Comprehensive loss attributable to noncontrolling interests	984	138	3,461	3,482
Comprehensive (loss) income attributable to IAC shareholders	$ (20,205)	$ 70,199	$ 21,029	$ 111,909