SUPPLEMENTAL CASH FLOW INFORMATION - SCHEDULE OF SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Supplemental Cash Flow Information [Abstract]
Interest—related party	$ 6,169	$ 417	$ 262
Income tax payments, including amounts paid to IAC for ANGI Homeservices share of IAC's consolidated tax liability	1,700	8,820	3,424
Income tax refunds	$ (402)	$ (263)	$ (657)