Property and Equipment, Net - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Depreciation and amortization	$ 6,730	$ 5,345	$ 4,189
Cost of Revenue [Member]
Property, Plant and Equipment [Line Items]
Depreciation and amortization	4,238	3,516	2,985
General and Administrative Expense [Member]
Property, Plant and Equipment [Line Items]
Depreciation and amortization	$ 2,492	$ 1,829	$ 1,204