EARNINGS PER SHARE - Summary (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share [Abstract]
Net earnings	$ 13,211	$ 7,234	$ 4,027	$ 17,085
Net earnings attributable to noncontrolling interests	(544)	(266)	(318)	(148)
Net earnings attributable to ANGI Homeservices Inc. shareholders	$ 12,667	$ 6,968	$ 3,709	$ 16,937
Weighted average basic shares outstanding (shares)	495,769	506,725	497,611	505,548
Dilutive securities (shares)	14,765	13,904	11,136	16,313
Weighted average diluted shares outstanding (shares)	510,534	520,629	508,747	521,861
Earnings per share attributable to ANGI Homeservices Inc. shareholders:
Basic earnings per share (USD per share)	$ 0.03	$ 0.01	$ 0.01	$ 0.03
Diluted earnings per share (USD per share)	$ 0.02	$ 0.01	$ 0.01	$ 0.03
Stock appreciation rights, stock options, subsidiary denominated equity, and restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities excluded from calculation of diluted earnings per share (shares)	4,900	4,200	5,400	4,200
PSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities excluded from calculation of diluted earnings per share (shares)	3,400	2,800	3,400	2,800