SEGMENT INFORMATION - Reconciliation of Adjusted EBITDA to Operating Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting, Other Significant Reconciling Item
Operating income (loss)	$ 24,726	$ 33,515	$ 32,488	$ 46,021
Stock-based compensation expense	8,784	22,474	45,586	69,433
Depreciation	11,244	6,100	27,039	18,170
Amortization of intangibles	14,169	15,611	42,421	47,695
Interest expense—third party	(3,007)	(3,132)	(8,964)	(8,797)
Interest expense—related party	0	(23)	(16)	(102)
Other income, net	1,505	1,566	4,839	2,975
Earnings before income taxes	23,224	31,926	28,347	40,097
Income tax provision	(4,900)	(5,140)	7,062	598
Net earnings	18,324	26,786	35,409	40,695
Net earnings attributable to noncontrolling interests	(325)	(169)	(473)	(64)
Net earnings attributable to ANGI Homeservices Inc. shareholders	17,999	26,617	34,936	40,631
North America
Segment Reporting, Other Significant Reconciling Item
Operating income (loss)	27,194	36,117	40,409	56,862
Stock-based compensation expense	8,648	22,256	45,107	68,652
Depreciation	10,690	5,563	25,124	16,491
Amortization of intangibles	13,977	14,677	41,164	44,301
Adjusted EBITDA	60,509	78,613	151,804	186,306
Europe
Segment Reporting, Other Significant Reconciling Item
Operating income (loss)	(2,468)	(2,602)	(7,921)	(10,841)
Stock-based compensation expense	136	218	479	781
Depreciation	554	537	1,915	1,679
Amortization of intangibles	192	934	1,257	3,394
Adjusted EBITDA	$ (1,586)	$ (913)	$ (4,270)	$ (4,987)