Property and Equipment, Net - Summary of Property and Equipment, Net (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 91,914	$ 88,618
Accumulated depreciation and amortization	(72,464)	(68,456)
Property and equipment, net	19,450	20,162
Buildings and Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	19,841	18,075
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	23,893	23,515
Capitalized Software [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	36,429	35,632
Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 11,751	$ 11,396