Goodwill and Intangible Assets, Net - Components of Intangible Assets (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Finite Lived Intangible Assets [Line Items]
Weighted average remaining useful life	4 years 1 month 6 days
Gross	$ 17,191	$ 17,191
Accumulated Amortization	(15,723)	(15,320)
Net	$ 1,468	$ 1,871
Customer Relationships [Member]
Finite Lived Intangible Assets [Line Items]
Weighted average remaining useful life	3 months 18 days	6 months
Gross	$ 13,997	$ 13,997
Accumulated Amortization	(13,647)	(13,297)
Net	$ 350	$ 700
Trade Name [Member]
Finite Lived Intangible Assets [Line Items]
Weighted average remaining useful life	5 years 3 months 18 days	5 years 6 months
Gross	$ 3,194	$ 3,194
Accumulated Amortization	(2,076)	(2,023)
Net	$ 1,118	$ 1,171