SEGMENT INFORMATION - Reconciliation of Adjusted EBITDA to Operating Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting, Other Significant Reconciling Item
Operating income (loss)	$ (3,019)	$ 24,726	$ (1,671)	$ 32,488
Stock-based compensation expense	14,697	8,784	55,031	45,586
Depreciation	13,921	11,244	38,614	27,039
Amortization of intangibles	12,888	14,169	38,846	42,421
Interest expense—third party	(3,699)	(3,007)	(7,593)	(8,964)
Other income, net	223	1,505	856	4,823
(Loss) earnings before income taxes	(6,495)	23,224	(8,408)	28,347
Income tax provision	11,698	(4,900)	17,638	7,062
Net earnings	5,203	18,324	9,230	35,409
Net earnings attributable to noncontrolling interests	(731)	(325)	(1,049)	(473)
Net earnings attributable to ANGI Homeservices Inc. shareholders	4,472	17,999	8,181	34,936
North America
Segment Reporting, Other Significant Reconciling Item
Operating income (loss)	295	27,194	8,377	40,409
Stock-based compensation expense	14,599	8,648	54,406	45,107
Depreciation	12,767	10,690	35,531	25,124
Amortization of intangibles	12,793	13,977	38,572	41,164
Adjusted EBITDA	40,454	60,509	136,886	151,804
Europe
Segment Reporting, Other Significant Reconciling Item
Operating income (loss)	(3,314)	(2,468)	(10,048)	(7,921)
Stock-based compensation expense	98	136	625	479
Depreciation	1,154	554	3,083	1,915
Amortization of intangibles	95	192	274	1,257
Adjusted EBITDA	$ (1,967)	$ (1,586)	$ (6,066)	$ (4,270)