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EARNINGS (LOSS) PER SHARE - Summary (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share [Abstract]
Net earnings (loss)									$ 35,314	$ 77,507	$ (104,527)
Net (earnings) loss attributable to noncontrolling interests									(485)	(189)	1,409
Net earnings (loss) attributable to ANGI Homeservices Inc. shareholders	$ (107)	$ 17,999	$ 6,968	$ 9,969	$ 36,687	$ 26,617	$ 22,899	$ (8,885)	$ 34,829	$ 77,318	$ (103,118)
Weighted average basic shares outstanding (shares)									504,875	484,232	430,612
Dilutive securities including stock appreciation rights, stock options, RSUs and subsidiary denominated equity awards (shares)									13,044	29,365	0
Weighted average diluted shares outstanding (shares)									517,919	513,597	430,612
Earnings (loss) per share attributable to ANGI Homeservices Inc. shareholders:
Basic (loss) earnings per share (USD per share)	$ 0.00	$ 0.04	$ 0.01	$ 0.02	$ 0.07	$ 0.06	$ 0.05	$ (0.02)	$ 0.07	$ 0.16	$ (0.24)
Diluted (loss) earnings per share (USD per share)	$ 0.00	$ 0.04	$ 0.01	$ 0.02	$ 0.07	$ 0.05	$ 0.05	$ (0.02)	$ 0.07	$ 0.15	$ (0.24)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities excluded from calculation of diluted earnings per share (shares)									5,500	3,100	54,100
PSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities excluded from calculation of diluted earnings per share (shares)									900	1,300