CONSOLIDATED AND COMBINED STATEMENT OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Total ANGI Homeservices Inc. Shareholders' Equity and Invested Capital	Redeemable Noncontrolling Interests	Common Stock Class A Common Stock	Common Stock Class B Common Stock	Common Stock Class C Common Stock	Additional Paid-in Capital	Accumulated Deficit	Invested Capital	Accumulated Other Comprehensive (Loss) Income	Noncontrolling Interests
Balance at beginning of period at Dec. 31, 2014	$ 144,334	$ 144,334	$ 6,478	$ 0	$ 0	$ 0	$ 0	$ 0	$ 144,817	$ (483)	$ 0
Balance at the beginning of the period (in shares) at Dec. 31, 2014				0	0	0
Increase (Decrease) in Shareholders' Equity
Net (loss) earnings	(1,325)	(1,325)	(2,671)						(1,325)
Other comprehensive income (loss)	(581)	(581)	0							(581)
Adjustment of redeemable noncontrolling interests to fair value	(12,170)	(12,170)	12,170						(12,170)
Net increase (decrease) in IAC/InterActiveCorp’s investment in HomeAdvisor	(3,008)	(3,008)							(3,008)
Other	0	0	1,657				0	0		0	0
Balance at end of period at Dec. 31, 2015	127,250	127,250	17,634	$ 0	$ 0	$ 0	0	0	128,314	(1,064)	0
Balance at the end of the period (in shares) at Dec. 31, 2015				0	0	0
Increase (Decrease) in Shareholders' Equity
Net (loss) earnings	13,008	13,128	(2,377)						13,128		(120)
Other comprehensive income (loss)	(657)	(657)	0							(657)
Adjustment of redeemable noncontrolling interests to fair value	3,110	3,110	(3,110)						3,110
Net increase (decrease) in IAC/InterActiveCorp’s investment in HomeAdvisor	10,300	10,300							10,300
Other	0	0	1,634				0	0		0	0
Noncontrolling interests created in an acquisition	9,811										9,811
Purchase of noncontrolling interests	(209)										(209)
Balance at end of period at Dec. 31, 2016	162,613	153,131	13,781	$ 0	$ 0	$ 0	0	0	154,852	(1,721)	9,482
Balance at the end of the period (in shares) at Dec. 31, 2016				0	0	0
Increase (Decrease) in Shareholders' Equity
Net (loss) earnings	(103,136)	(103,118)	(1,391)				0	(121,764)	18,646	0	(18)
Other comprehensive income (loss)	4,210	3,953	758				0	0		3,953	257
Adjustment of redeemable noncontrolling interests to fair value	(3,332)	(3,332)	3,332				(1,607)	0	(1,725)	0	0
Net increase (decrease) in IAC/InterActiveCorp’s investment in HomeAdvisor	46,339	46,339							46,339
Other	816	(59)	36				(59)	0		0	875
Noncontrolling interests created in an acquisition	0		14,758
Purchase of noncontrolling interests	(848)										(848)
Contribution of IAC/InterActiveCorp's HomeAdvisor business to ANGI Homeservices Inc. and Combination with Angie's List	779,471	779,471		$ 61	$ 415		997,107		(218,112)
Contribution of IAC/InterActiveCorp's HomeAdvisor business to ANGI Homeservices Inc. and Combination with Angie's List (in shares)				61,291,000	414,754,000
Stock-based compensation expense	125,451	125,451	2,017				125,451
Issuance of common stock pursuant to stock-based awards, net of withholding taxes	(8,490)	(8,490)		$ 2			(8,492)
Issuance of common stock pursuant to stock-based awards, net of withholding taxes (in shares)				1,527,000
Issuance of common stock to IAC pursuant to the employee matters agreement (in shares)					432,000
Issuance of common stock to IAC pursuant to the employee matters agreement	0
Purchase of redeemable noncontrolling interests	0		11,991
Balance at end of period at Dec. 31, 2017	$ 1,003,094	$ 993,346	$ 21,300	$ 63	$ 415	$ 0	$ 1,112,400	$ (121,764)	$ 0	$ 2,232	$ 9,748
Balance at the end of the period (in shares) at Dec. 31, 2017				62,818,000	415,186,000	0