SUPPLEMENTAL CASH FLOW INFORMATION - Narrative (Details) - USD ($) shares in Thousands, $ in Thousands	Dec. 31, 2018	Oct. 19, 2018	Oct. 10, 2018	Dec. 31, 2017	Sep. 29, 2017
Handy
Class of Stock [Line Items]
Common stock issued (shares)		8,600
Common stock		$ 165,800
Class A Common Stock
Class of Stock [Line Items]
Common stock issued (shares)	80,515			62,818
Common stock	$ 81			$ 63
Class A Common Stock | Angie's List
Class of Stock [Line Items]
Common stock issued (shares)					61,300
Common stock					$ 763,684
Class B Common Stock
Class of Stock [Line Items]
Common stock issued (shares)	421,118			415,186
Common stock	$ 421			$ 415
Class B Common Stock | Angie's List
Class of Stock [Line Items]
Common stock issued (shares)			5,100
ANGI Homeservices | Class A Common Stock
Class of Stock [Line Items]
Common stock issued (shares)		8,600
Common stock		$ 165,800