Property and Equipment, Net - Summary of Property and Equipment, Net (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	$ 144,324	$ 105,153
Accumulated depreciation and amortization	(43,212)	(39,243)
Property and equipment, net	101,112	65,910
Land [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	8,146	7,736
Building and leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	$ 77,020	51,309
Building and leasehold improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Useful lives	5 years
Building and leasehold improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Useful lives	39 years
Computer equipment and purchased software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	$ 42,245	34,058
Computer equipment and purchased software [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Useful lives	3 years
Computer equipment and purchased software [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Useful lives	5 years
Furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	$ 16,661	11,812
Furniture and fixtures [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Useful lives	5 years
Transportation equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	$ 252	$ 238
Transportation equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Useful lives	5 years