EARNINGS (LOSS) PER SHARE - Summary (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Net earnings (loss)	$ 9,851	$ (9,114)
Net loss attributable to noncontrolling interests	118	229
Net earnings (loss) attributable to ANGI Homeservices Inc. shareholders	$ 9,969	$ (8,885)
Weighted average basic shares outstanding (shares)	504,404	478,309
Dilutive securities (shares)	18,721	0
Weighted average diluted shares outstanding (shares)	523,125	478,309
Earnings (loss) per share attributable to ANGI Homeservices Inc. shareholders:
Basic earnings (loss) per share (USD per share)	$ 0.02	$ (0.02)
Diluted earnings (loss) per share (USD per share)	$ 0.02	$ (0.02)
Stock options, warrants, and subsidiary denominated equity exchange of Exchangeable Notes and vesting of RSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities excluded from calculation of diluted earnings per share (shares)	4,200
Market-based awards and PSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities excluded from calculation of diluted earnings per share (shares)	800	50,800

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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