SEGMENT INFORMATION - Reconciliation of Adjusted EBITDA to Operating Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Segment Reporting, Other Significant Reconciling Item
Operating income (loss)	$ (3,641)	$ (10,756)
Stock-based compensation expense	19,282	24,906
Depreciation	6,999	6,184
Amortization of intangibles	14,539	16,306
Interest expense—third party	(2,994)	(2,654)
Interest expense—related party	(16)	(45)
Other income, net	2,287	356
Loss before income taxes	(4,364)	(13,099)
Income tax benefit	14,215	3,985
Net earnings (loss)	9,851	(9,114)
Net loss attributable to noncontrolling interests	118	229
Net earnings (loss) attributable to ANGI Homeservices Inc. shareholders	9,969	(8,885)
North America
Segment Reporting, Other Significant Reconciling Item
Operating income (loss)	742	(5,365)
Stock-based compensation expense	19,072	24,575
Depreciation	6,207	5,574
Amortization of intangibles	13,668	14,821
Adjusted EBITDA	39,689	39,605
Europe
Segment Reporting, Other Significant Reconciling Item
Operating income (loss)	(4,383)	(5,391)
Stock-based compensation expense	210	331
Depreciation	792	610
Amortization of intangibles	871	1,485
Adjusted EBITDA	$ (2,510)	$ (2,965)