SEGMENT INFORMATION - Reconciliation of Adjusted EBITDA to Operating Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting, Other Significant Reconciling Item
Operating income (loss)	$ (10,756)	$ 1,388
Stock-based compensation expense	24,906	4,461
Depreciation	6,184	2,996
Amortization of intangibles	16,306	1,367
Adjusted EBITDA	36,640	10,212
Interest expense—third party	(2,654)	0
Interest expense—related party	(45)	(1,592)
Other income, net	356	231
(Loss) earnings before income taxes	(13,099)	27
Income tax benefit	3,985	25,860
Net (loss) earnings	(9,114)	25,887
Net loss attributable to noncontrolling interests	229	726
Net (loss) earnings attributable to ANGI Homeservices Inc. shareholders	(8,885)	26,613
North America
Segment Reporting, Other Significant Reconciling Item
Operating income (loss)	(5,365)	6,424
Stock-based compensation expense	24,575	4,001
Depreciation	5,574	2,885
Amortization of intangibles	14,821	874
Adjusted EBITDA	39,605	14,184
Europe
Segment Reporting, Other Significant Reconciling Item
Operating income (loss)	(5,391)	(5,036)
Stock-based compensation expense	331	460
Depreciation	610	111
Amortization of intangibles	1,485	493
Adjusted EBITDA	$ (2,965)	$ (3,972)