EARNINGS PER SHARE - Summary (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Net earnings (loss)	$ 23,023	$ (25)	$ 13,909	$ 25,862
Net (earnings) loss attributable to noncontrolling interests	(124)	279	105	1,005
Net earnings attributable to ANGI Homeservices Inc. shareholders	$ 22,899	$ 254	$ 14,014	$ 26,867
Weighted average basic shares outstanding (shares)	480,618	414,754	479,470	414,754
Dilutive securities including stock appreciation rights, stock options, RSUs and subsidiary denominated equity awards (shares)	28,145	0	27,544	0
Weighted average diluted shares outstanding (shares)	508,763	414,754	507,014	414,754
Earnings per share attributable to ANGI Homeservices Inc. shareholders:
Basic earnings per share (USD per share)	$ 0.05	$ 0.00	$ 0.03	$ 0.06
Diluted earnings per share (USD per share)	$ 0.05	$ 0.00	$ 0.03	$ 0.06
Subsidiary Denominated Equity, Stock Options, and RSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities excluded from calculation of diluted earnings per share (shares)	100		300
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)	1,300		1,300

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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