Goodwill and Intangible Assets - Summary of Intangible Assets from Continuing Operations (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 118,620	$ 118,756
Accumulated Amortization	(49,713)	(46,050)
Net Carrying Amount	68,907	72,706
Acquired Indefinite-lived Intangible Assets [Line Items]
Estimated salvage value of the asset	400	400
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Gross Carrying Amount	119,320	119,456
Net Carrying Amount	69,607	73,406
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	65,486	65,603
Accumulated Amortization	(23,640)	(21,783)
Net Carrying Amount	$ 41,846	$ 43,820
Customer relationships | Minimum
Acquired Finite-Lived Intangible Assets [Line Items]
Useful Life	3 years	3 years
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	$ 22,904	$ 22,904
Accumulated Amortization	(10,847)	(10,043)
Net Carrying Amount	$ 12,057	$ 12,861
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	$ 26,322	$ 26,334
Accumulated Amortization	(11,654)	(10,675)
Net Carrying Amount	$ 14,668	$ 15,659
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	9 years	9 years
Non-compete agreements
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 3,908	$ 3,915
Accumulated Amortization	(3,572)	(3,549)
Net Carrying Amount	$ 336	$ 366
Non-compete agreements | Minimum
Acquired Finite-Lived Intangible Assets [Line Items]
Useful Life	3 years	3 years
Non-compete agreements | Maximum
Acquired Finite-Lived Intangible Assets [Line Items]
Useful Life	5 years	5 years