BUSINESS COMBINATIONS - Preliminary Estimated Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Oct. 19, 2018	Dec. 31, 2017	Sep. 29, 2017	Mar. 24, 2017	Feb. 08, 2017	Dec. 31, 2016	Nov. 03, 2016
Business Acquisition
Goodwill	$ 894,709		$ 770,226				$ 170,990
Handy
Business Acquisition
Cash and cash equivalents		$ 5,710
Other current assets		2,050
Goodwill		142,102
Intangible assets		38,800
Other non-current assets		14,280
Total assets		202,942
Current liabilities		(28,644)
Deferred income taxes		(8,770)
Net assets acquired		$ 165,528
Angie's List
Business Acquisition
Cash and cash equivalents				$ 44,270
Other current assets				11,280
Property and equipment				16,341
Goodwill				545,204
Intangible assets				317,300
Total assets				934,395
Deferred revenue				(32,595)
Other current liabilities				(46,150)
Long-term debt - related party				(61,498)
Deferred income taxes				(11,363)
Other long-term liabilities				(1,405)
Net assets acquired				$ 781,384
HomeStars
Business Acquisition
Cash and cash equivalents						$ 181
Other current assets						165
Goodwill						9,841
Intangible assets						6,414
Total assets						16,601
Current liabilities						(649)
Other long-term liabilities						(1,873)
Net assets acquired						$ 14,079
MyBuilder
Business Acquisition
Cash and cash equivalents					$ 6,004
Other current assets					344
Goodwill					37,072
Intangible assets					15,239
Total assets					58,659
Current liabilities					(2,065)
Other long-term liabilities					(2,595)
Net assets acquired					$ 53,999
MyHammer
Business Acquisition
Cash and cash equivalents								$ 4,041
Other current assets								790
Goodwill								22,277
Intangible assets								8,107
Total assets								35,215
Current liabilities								(2,642)
Other long-term liabilities								(2,447)
Net assets acquired								$ 30,126