RELATED PARTY TRANSACTIONS - SCHEDULE OF RELATED PARTY TRANSACTIONS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Related Party Transaction [Line Items]
Taxes	$ 49,106	$ (11,834)	$ (1,758)
Interest income from related party	700
Net (increase) decrease in IAC’s investment in HomeAdvisor	46,339	10,300	(3,008)
IAC
Related Party Transaction [Line Items]
Cash transfers (from) to IAC related to its centrally managed U.S. treasury management function, acquisitions and cash expenses paid by IAC on behalf of HomeAdvisor, net	(80,368)	(363)	8,801
Taxes	38,162	(5,968)	(3,281)
Interest income from related party	656	278	86
Allocation of general and administrative expense	(4,789)	(4,247)	(2,598)
Net (increase) decrease in IAC’s investment in HomeAdvisor	$ (46,339)	$ (10,300)	$ 3,008