Property and Equipment, Net - Summary of Property and Equipment, Net (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 88,385	$ 85,760
Accumulated depreciation and amortization	(69,910)	(66,805)
Property and equipment, net	18,475	18,955
Buildings and Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	19,371	18,380
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	21,979	22,087
Capitalized Software [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	35,549	34,983
Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 11,486	$ 10,310