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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, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share [Abstract]
Net earnings (loss)									$ 77,507	$ (104,527)	$ 10,631
Net (earnings) loss attributable to noncontrolling interests									(189)	1,409	2,497
Net earnings (loss) attributable to ANGI Homeservices Inc. shareholders	$ 36,687	$ 26,617	$ 22,899	$ (8,885)	$ (58,224)	$ (71,761)	$ 254	$ 26,613	$ 77,318	$ (103,118)	$ 13,128
Weighted average basic shares outstanding (shares)									484,232	430,612	414,754
Dilutive securities including stock appreciation rights, stock options, RSUs and subsidiary denominated equity awards (shares)									29,365	0	0
Weighted average diluted shares outstanding (shares)									513,597	430,612	414,754
Earnings (loss) per share attributable to ANGI Homeservices Inc. shareholders:
Basic (loss) earnings per share (USD per share)	$ 0.07	$ 0.06	$ 0.05	$ (0.02)	$ (0.12)	$ (0.17)		$ 0.06	$ 0.16	$ (0.24)	$ 0.03
Diluted (loss) earnings per share (USD per share)	$ 0.07	$ 0.05	$ 0.05	$ (0.02)	$ (0.12)	$ (0.17)		$ 0.06	$ 0.15	$ (0.24)	$ 0.03
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities excluded from calculation of diluted earnings per share (shares)									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)									1,300