EARNINGS PER SHARE - Summary (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share [Abstract]
Net earnings	$ 18,324	$ 26,786	$ 35,409	$ 40,695
Net earnings attributable to noncontrolling interests	(325)	(169)	(473)	(64)
Net earnings attributable to ANGI Homeservices Inc. shareholders	$ 17,999	$ 26,617	$ 34,936	$ 40,631
Weighted average basic shares outstanding (shares)	505,836	481,570	505,661	480,178
Dilutive securities (shares)	6,241	39,269	12,955	31,452
Weighted average diluted shares outstanding (shares)	512,077	520,839	518,616	511,630
Earnings per share attributable to ANGI Homeservices Inc. shareholders:
Basic earnings per share (USD per share)	$ 0.04	$ 0.06	$ 0.07	$ 0.08
Diluted earnings per share (USD per share)	$ 0.04	$ 0.05	$ 0.07	$ 0.08
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)	6,400	200		300
PSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities excluded from calculation of diluted earnings per share (shares)	4,800	1,200	4,800	1,200

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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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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