Goodwill and Intangible Assets, Net - Components of Intangible Assets (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Finite Lived Intangible Assets [Line Items]
Weighted average remaining useful life	5 years
Gross	$ 17,191	$ 17,191
Accumulated Amortization	(16,126)	(15,320)
Net	$ 1,065	$ 1,871
Customer Relationships [Member]
Finite Lived Intangible Assets [Line Items]
Weighted average remaining useful life	0 years	6 months
Gross	$ 13,997	$ 13,997
Accumulated Amortization	$ (13,997)	(13,297)
Net		$ 700
Trade Name [Member]
Finite Lived Intangible Assets [Line Items]
Weighted average remaining useful life	5 years	5 years 6 months
Gross	$ 3,194	$ 3,194
Accumulated Amortization	(2,129)	(2,023)
Net	$ 1,065	$ 1,171