EARNINGS PER SHARE - Summary (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
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
Weighted average basic shares outstanding (shares)	497,501	505,836	497,574	505,661
Dilutive securities (shares)	17,218	6,241	13,901	12,955
Weighted average diluted shares outstanding (shares)	514,719	512,077	511,475	518,616
Earnings per share attributable to ANGI Homeservices Inc. shareholders:
Basic earnings per share (USD per share)	$ 0.01	$ 0.04	$ 0.02	$ 0.07
Diluted earnings per share (USD per share)	$ 0.01	$ 0.04	$ 0.02	$ 0.07
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)	1,400	6,400	5,400	6,000
PSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities excluded from calculation of diluted earnings per share (shares)	1,200	4,800	1,200	4,800