CONSOLIDATED AND COMBINED FINANCIAL STATEMENT DETAILS - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash paid (received) during the year for:
Interest expense—third-party	$ 10,290	$ 12,148	$ 0
Interest expense—related party	54	155	6,169
Income tax payments, including amounts paid to IAC for ANGI Homeservices' share of IAC's consolidated tax liability	12,224	332	1,700
Income tax refunds	$ (957)	$ (172)	$ (402)