CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Redeemable Noncontrolling Interests	Total IAC Shareholders' Equity	Common Stock Common Stock $.001 Par Value	Common Stock Class B Convertible Common Stock $.001 Par Value	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock	Noncontrolling Interests	Match Group	Match Group Total IAC Shareholders' Equity	Match Group Additional Paid-in Capital	Match Group Accumulated Other Comprehensive Loss	Match Group Noncontrolling Interests	ANGI Homeservices	ANGI Homeservices Total IAC Shareholders' Equity	ANGI Homeservices Additional Paid-in Capital	ANGI Homeservices Accumulated Other Comprehensive Loss	ANGI Homeservices Noncontrolling Interests
Increase (Decrease) in Shareholders' Equity
Cumulative effect of adoption of ASU No. 2014-09	$ 40,205		$ 36,795				$ 36,795			$ 3,410
Balance at beginning of period at Dec. 31, 2017	42,867	$ 42,867
Increase (Decrease) in Redeemable Noncontrolling Interests
Net earnings		34,756
Other comprehensive loss, net of tax		(286)
Stock-based compensation expense		800
Purchase of redeemable noncontrolling interests		(59)
Adjustment of redeemable noncontrolling interests to fair value		1,849
Noncontrolling interests created in acquisitions		2,261														$ 14,246				$ 14,246
Other		(6,469)
Balance at end of period at Jun. 30, 2018	75,719	75,719
Balance at beginning of period at Dec. 31, 2017	2,946,823		2,430,028	$ 261	$ 16	$ 12,165,002	595,038	$ (103,568)	$ (10,226,721)	516,795
Balance at beginning of period (shares) at Dec. 31, 2017				260,624,000	16,157,000
Increase (Decrease) in Shareholders' Equity
Net earnings	333,937		289,435				289,435			44,502
Other comprehensive loss, net of tax	(10,884)		(9,087)					(9,087)		(1,797)
Stock-based compensation expense	115,843		36,015			36,015				79,828
Issuance of common stock pursuant to stock-based awards, net of withholding taxes	25,891		25,891	$ 1		25,890
Issuance of common stock pursuant to stock-based awards, net of withholding taxes (in shares)				1,133,000
Purchase of treasury stock	(14,713)		(14,713)						(14,713)
Purchase of noncontrolling interests	(818)									(818)
Adjustment of redeemable noncontrolling interests to fair value	(1,849)		(1,849)			(1,849)
Issuance of common stock pursuant to stock-based awards, net of withholding taxes, and impact to noncontrolling interests											$ (195,094)	$ (194,809)	$ (194,764)	$ (45)	$ (285)	(19,290)	$ (24,019)	$ (24,002)	$ (17)	4,729
Noncontrolling interests created in acquisitions		$ 2,261														$ 14,246				$ 14,246
Other	2,651		2,392			2,392				259
Balance at end of period at Jun. 30, 2018	$ 3,236,948		$ 2,576,079	$ 262	$ 16	$ 12,008,684	$ 921,268	$ (112,717)	$ (10,241,434)	$ 660,869
Balance at end of period (shares) at Jun. 30, 2018				261,757,000	16,157,000