BUSINESS COMBINATIONS - PRELIMINARY ESTIMATED FAIR VALUE OF ASSETS ACQUIRED AND LIABILITIES ASSUMED (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Sep. 29, 2017	Mar. 24, 2017	Feb. 08, 2017	Dec. 31, 2016	Nov. 03, 2016	Dec. 31, 2015
Business Acquisition
Goodwill	$ 770,226				$ 170,990		$ 150,630
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