Goodwill and Intangible Assets - Summary of Intangible Assets from Continuing Operations (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 114,893	$ 111,409
Accumulated Amortization	(42,398)	(31,666)
Net Carrying Amount	72,495	79,743
Estimated salvage value of the asset	400	400
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Gross Carrying Amount	115,593	112,109
Net Carrying Amount	73,195	80,443
Other intellectual property
Acquired Indefinite-lived Intangible Assets [Line Items]
Intangible assets (excluding goodwill)	700	700
Internet domain names
Acquired Indefinite-lived Intangible Assets [Line Items]
Intangible assets (excluding goodwill)	300	300
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	63,307	61,820
Accumulated Amortization	(19,947)	(14,377)
Net Carrying Amount	$ 43,360	$ 47,443
Customer relationships | Minimum
Acquired Finite-Lived Intangible Assets [Line Items]
Useful Life	1 year	1 year
Customer relationships | Maximum
Acquired Finite-Lived Intangible Assets [Line Items]
Useful Life	11 years	11 years
Trademarks/trade names
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 22,898	$ 22,898
Accumulated Amortization	(9,240)	(6,829)
Net Carrying Amount	$ 13,658	$ 16,069
Trademarks/trade names | Minimum
Acquired Finite-Lived Intangible Assets [Line Items]
Useful Life	3 years	3 years
Trademarks/trade names | Maximum
Acquired Finite-Lived Intangible Assets [Line Items]
Useful Life	11 years	11 years
Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 25,083	$ 23,086
Accumulated Amortization	(9,678)	(6,945)
Net Carrying Amount	$ 15,405	$ 16,141
Technology | Minimum
Acquired Finite-Lived Intangible Assets [Line Items]
Useful Life	5 years	5 years
Technology | Maximum
Acquired Finite-Lived Intangible Assets [Line Items]
Useful Life	10 years	10 years
Non-compete agreements
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 3,605	$ 3,605
Accumulated Amortization	(3,533)	(3,515)
Net Carrying Amount	$ 72	$ 90
Non-compete agreements | Minimum
Acquired Finite-Lived Intangible Assets [Line Items]
Useful Life	2 years	2 years
Non-compete agreements | Maximum
Acquired Finite-Lived Intangible Assets [Line Items]
Useful Life	5 years	5 years