CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Redeemable Noncontrolling Interests	IAC	Common Stock Common Stock	Common Stock Class B Convertible Common Stock	Additional Paid-in Capital	(Accumulated Deficit) Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock	Noncontrolling Interests
Balance at the beginning 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 beginning of the period (in shares) at Dec. 31, 2012					250,982	16,157
Increase (Decrease) in Shareholders' Equity
Net (loss) earnings for period	286,989			285,784				285,784			1,205
Other comprehensive loss, net of tax	20,490			19,123					19,123		1,367
Stock-based compensation expense	53,005			51,883			51,883				1,122
Issuance of common stock pursuant to stock-based awards, net of withholding taxes	(9,897)			(9,897)			(9,899)			2
Income tax benefit related to stock-based awards	30,986			30,986			30,986
Dividends	(77,830)			(77,830)			(77,830)
Purchase of treasury stock	(229,101)	$ (229,100)		(229,101)						(229,101)
Adjustment of redeemable noncontrolling interests and noncontrolling interests to fair value	(40,638)			(42,947)			(42,947)				2,309
Transfer from noncontrolling interests to redeemable noncontrolling interests	(2,874)										(2,874)
Purchase of redeemable noncontrolling interests	(12,371)										(12,371)
Other	3,007			3,007			3,007
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
Balance at the beginning of the period at Dec. 31, 2012			$ 58,126
Increase (Decrease) in Temporary Equity
Net (loss) earnings for period			(3,264)
Other comprehensive (loss) income, net of tax			2,305
Purchase of redeemable noncontrolling interests			(55,576)
Adjustment of redeemable noncontrolling interests to fair value			40,638
Transfer from noncontrolling interests to redeemable noncontrolling interests			2,874
Other			(2,242)
Balance at the end of the period at Dec. 31, 2013			42,861
Increase (Decrease) in Shareholders' Equity
Net (loss) earnings for period	414,873			414,873				414,873
Other comprehensive loss, net of tax	(74,551)			(74,654)					(74,654)		103
Stock-based compensation expense	59,076			59,362			59,362				(286)
Issuance of common stock pursuant to stock-based awards, net of withholding taxes	1,628			1,628	$ 1		(167,340)			168,967
Issuance of common stock upon exercise pursuant to stock-based awards, net of withholding taxes (in shares)					1,188
Income tax benefit related to stock-based awards	37,451			37,451			37,451
Dividends	(96,577)			(96,577)			(39,557)	(57,020)
Adjustment of redeemable noncontrolling interests and noncontrolling interests to fair value	(27,750)			(37,119)			(37,119)				9,369
Purchase of redeemable noncontrolling interests	(50,662)										(50,662)
Other	253			253			253				0
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
Increase (Decrease) in Temporary Equity
Net (loss) earnings for period			(5,643)
Other comprehensive (loss) income, net of tax			(914)
Stock-based compensation expense			558
Noncontrolling interests related to acquisitions			17,886
Purchase of redeemable noncontrolling interests			(41,743)
Adjustment of redeemable noncontrolling interests to fair value			27,750
Other			(328)
Balance at the end of the period at Dec. 31, 2014	40,427		40,427
Increase (Decrease) in Shareholders' Equity
Net (loss) earnings for period	121,111			119,472				119,472			1,639
Other comprehensive loss, net of tax	(64,403)			(64,403)					(64,403)
Stock-based compensation expense	92,493			87,685			87,685				4,808
Issuance of common stock pursuant to stock-based awards, net of withholding taxes	(37,731)			(37,731)	$ 2		(37,733)
Issuance of common stock upon exercise pursuant to stock-based awards, net of withholding taxes (in shares)					1,845
Income tax benefit related to stock-based awards	44,577			44,577			44,577
Dividends	(113,196)			(113,196)			0	(113,196)
Purchase of treasury stock	(200,000)	$ (200,000)		(200,000)						(200,000)
Adjustment of redeemable noncontrolling interests and noncontrolling interests to fair value	(23,155)			(23,155)			(23,155)
Noncontrolling interests related to Match IPO, net of fees and expenses	428,283										428,283
Purchase of redeemable noncontrolling interests	(23,431)										(23,431)
Other	(676)			(676)			(676)
Balance at the end of the period at Dec. 31, 2015	2,215,825			$ 1,804,526	$ 254	$ 16	$ 11,486,315	$ 331,394	$ (152,103)	$ (9,861,350)	411,299
Balance at the end of the period (in shares) at Dec. 31, 2015					254,015	16,157
Increase (Decrease) in Temporary Equity
Net (loss) earnings for period			(7,737)
Other comprehensive (loss) income, net of tax			(1,301)
Stock-based compensation expense			6,725
Purchase of redeemable noncontrolling interests			(32,207)
Adjustment of redeemable noncontrolling interests to fair value			23,155
Transfer from noncontrolling interests to redeemable noncontrolling interests	(1,189)		1,189								$ (1,189)
Other			140
Balance at the end of the period at Dec. 31, 2015	$ 30,391		$ 30,391