CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified	Total	IAC	Common Stock	Common Stock Class B Convertible Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss	Treasury Stock	Noncontrolling Interests	Redeemable Noncontrolling Interests
Redeemable noncontrolling interests, balance at Dec. 31, 2012	$ 58,126									$ 58,126
Balance at Dec. 31, 2012	1,707,635	1,655,728	251	16	11,607,367	(318,519)	(32,169)	(9,601,218)	51,907
Balance (in shares) at Dec. 31, 2012			250,982	16,157
Increase (Decrease) in Shareholders' Equity
Net (loss) earnings for the six months ended June 30, 2013	111,688	111,927				111,927			(239)
Redeemable noncontrolling interests, net (loss) earnings for the six months ended June 30, 2013										(2,451)
Other comprehensive loss, net of tax	(519)	(18)					(18)		(501)
Non-cash compensation expense	24,483	24,277			24,277				206
Redeemable noncontrolling interests, other comprehensive loss, net of tax										(291)
Issuance of common stock upon exercise of stock options, vesting of restricted stock units and other, net of withholding taxes	(5,717)	(5,717)	0		(5,719)			2
Issuance of common stock upon exercise of stock options, vesting of restricted stock units and other, net of withholding taxes (in shares)			0
Income tax benefit related to the exercise of stock options, vesting of restricted stock units and other	23,308	23,308			23,308
Dividends	(37,703)	(37,703)			(37,703)
Purchase of treasury stock	(133,263)	(133,263)						(133,263)
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests										(1,347)
Fair value of redeemable noncontrolling interests adjustment	(9,787)	(9,787)			(9,787)					9,787
Transfer from noncontrolling interests to redeemable noncontrolling interests	(144)								(144)	144
Redeemable noncontrolling interests, other										179
Stockholders' Equity, Other	2,553	2,553			2,553				0
Redeemable noncontrolling interests, balance at Jun. 30, 2013	64,147									64,147
Balance at Jun. 30, 2013	1,682,534	1,631,305	251	16	11,604,296	(206,592)	(32,187)	(9,734,479)	51,229
Balance (in shares) at Jun. 30, 2013			250,982	16,157
Redeemable noncontrolling interests, balance at Mar. 31, 2013
Increase (Decrease) in Shareholders' Equity
Other comprehensive loss, net of tax							11,909
Balance at Jun. 30, 2013				$ 16			$ (32,187)
Balance (in shares) at Jun. 30, 2013				16,157