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 nine months ended September 30, 2013	208,911	208,867				208,867			44
Redeemable noncontrolling interests, net (loss) earnings for the nine months ended September 30, 2013										(4,039)
Other comprehensive income, net of tax	26,366	25,544					25,544		822
Non-cash compensation expense	38,848	38,305			38,305				543
Redeemable noncontrolling interests, other comprehensive income, net of tax										1,730
Issuance of common stock upon exercise of stock options, vesting of restricted stock units and other, net of withholding taxes	1,655	1,655			1,653			2
Income tax benefit related to the exercise of stock options, vesting of restricted stock units and other	26,329	26,329			26,329
Dividends	(57,624)	(57,624)			(57,624)
Purchase of treasury stock	(133,263)	(133,263)						(133,263)
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests										(56,498)
Fair value of redeemable noncontrolling interests adjustment	(33,038)	(33,038)			(33,038)					33,038
Transfer from noncontrolling interests to redeemable noncontrolling interests	(376)								(376)	376
Redeemable noncontrolling interests, other										46
Stockholders' Equity, Other	2,553	2,553			2,553
Redeemable noncontrolling interests, balance at Sep. 30, 2013	32,779									32,779
Balance at Sep. 30, 2013	1,787,996	1,735,056	251	16	11,585,545	(109,652)	(6,625)	(9,734,479)	52,940
Balance (in shares) at Sep. 30, 2013			250,982	16,157
Redeemable noncontrolling interests, balance at Jun. 30, 2013
Increase (Decrease) in Shareholders' Equity
Other comprehensive income, net of tax							25,562
Balance at Sep. 30, 2013			$ 251	$ 16			$ (6,625)
Balance (in shares) at Sep. 30, 2013			250,982	16,157