CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified	Total	Redeemable Noncontrolling Interests	IAC	Common Stock	Common Stock Class B convertible common stock	Additional Paid-in Capital	(Accumulated Deficit) Retained Earnings	Accumulated Other Comprehensive (Loss) Income	Treasury Stock	Noncontrolling Interests
Redeemable noncontrolling interests, balance at the beginning of the period at Dec. 31, 2011		$ 50,349
Balance at the beginning of the period at Dec. 31, 2011	1,960,140		1,905,049	234	16	11,280,173	(477,785)	(12,443)	(8,885,146)	55,091
Balance at the beginning of the period (in shares) at Dec. 31, 2011				234,101	16,157
Increase (Decrease) in Shareholders' Equity
Net (loss) earnings for the year	161,914		159,266				159,266			2,648
Redeemable noncontrolling interests, net (loss) earnings for the year		(1,118)
Other comprehensive (loss) income, net of tax	(19,322)		(19,726)					(19,726)		404
Redeemable noncontrolling interests, other comprehensive (loss) income, net of tax		207
Non-cash compensation expense	85,625		82,807	0	0	82,807	0	0	0	2,818
Issuance of common stock upon exercise of stock options, vesting of restricted stock units and other, net of withholding taxes	(16,498)		(16,498)	5		(16,503)			0
Issuance of common stock upon exercise of stock options, vesting of restricted stock units and other, net of withholding taxes (in shares)				5,153
Income tax benefit related to the exercise of stock options, vesting of restricted stock units and other	49,967		49,967			49,967
Issuance of common stock upon exercise of warrants	284,111		284,111	12		284,099
Issuance of common stock upon exercise of warrants (in shares)				11,728
Dividends	(68,901)		(68,901)			(68,901)	0
Purchase of treasury stock	(716,072)		(716,072)						(716,072)
Purchase of redeemable noncontrolling interests		(2,955)
Adjustment of redeemable noncontrolling interests and noncontrolling interests to fair value	(4,275)	4,275	(4,275)			(4,275)				0
Transfer from noncontrolling interests to redeemable noncontrolling interests	(10,049)	10,049								(10,049)
Other	995									995
Redeemable noncontrolling interests, other		(2,681)
Redeemable noncontrolling interests, balance at the end of the period at Dec. 31, 2012		58,126
Balance at the end of the period 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 at the end of the period (in shares) at Dec. 31, 2012				250,982	16,157
Increase (Decrease) in Shareholders' Equity
Net (loss) earnings for the year	286,989		285,784				285,784			1,205
Redeemable noncontrolling interests, net (loss) earnings for the year		(3,264)
Other comprehensive (loss) income, net of tax	20,490		19,123					19,123		1,367
Redeemable noncontrolling interests, other comprehensive (loss) income, net of tax		2,305
Non-cash compensation expense	53,005		51,883			51,883				1,122
Issuance of common stock upon exercise of stock options, vesting of restricted stock units and other, net of withholding taxes	(9,897)		(9,897)			(9,899)			2
Income tax benefit related to the exercise of stock options, vesting of restricted stock units and other	30,986		30,986			30,986
Dividends	(77,830)		(77,830)			(77,830)	0
Purchase of treasury stock	(229,101)	0	(229,101)		0				(229,101)
Purchase of redeemable noncontrolling interests	(12,371)	(55,576)								(12,371)
Adjustment of redeemable noncontrolling interests and noncontrolling interests to fair value	(40,638)	40,638	(42,947)			(42,947)				2,309
Transfer from noncontrolling interests to redeemable noncontrolling interests	(2,874)	2,874								(2,874)
Other	(3,007)		(3,007)			(3,007)				0
Redeemable noncontrolling interests, other		(2,242)
Redeemable noncontrolling interests, balance at the end of the period at Dec. 31, 2013	42,861	42,861
Balance at the end of the period at Dec. 31, 2013	1,729,401		1,686,736	251	16	11,562,567	(32,735)	(13,046)	(9,830,317)	42,665
Balance at the end of the period (in shares) at Dec. 31, 2013				250,982	16,157
Increase (Decrease) in Shareholders' Equity
Net (loss) earnings for the year	414,873		414,873				414,873			0
Redeemable noncontrolling interests, net (loss) earnings for the year		(5,643)
Other comprehensive (loss) income, net of tax	(74,551)		(74,654)					(74,654)		103
Redeemable noncontrolling interests, other comprehensive (loss) income, net of tax		(914)
Non-cash compensation expense	59,076	558	59,362			59,362				(286)
Issuance of common stock upon exercise of stock options, vesting of restricted stock units and other, net of withholding taxes	1,628		1,628	1		(167,340)			168,967
Issuance of common stock upon exercise of stock options, vesting of restricted stock units and other, net of withholding taxes (in shares)				1,188
Income tax benefit related to the exercise of stock options, vesting of restricted stock units and other	37,451		37,451			37,451
Dividends	(96,577)		(96,577)			(39,557)	(57,020)
Noncontrolling interests related to acquisitions		17,886
Purchase of redeemable noncontrolling interests	(50,662)	(41,743)								(50,662)
Adjustment of redeemable noncontrolling interests and noncontrolling interests to fair value	(27,750)	27,750	(37,119)			(37,119)				9,369
Other	(253)		(253)			(253)
Redeemable noncontrolling interests, other		(328)
Redeemable noncontrolling interests, balance at the end of the period at Dec. 31, 2014	40,427	40,427
Balance at the end of the period at Dec. 31, 2014	$ 1,993,142		$ 1,991,953	$ 252	$ 16	$ 11,415,617	$ 325,118	$ (87,700)	$ (9,661,350)	$ 1,189
Balance at the end of the period (in shares) at Dec. 31, 2014				252,170	16,157