Property and Equipment - Components of Property and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 363,532	$ 369,921
Less accumulated depreciation	(94,093)	(96,700)
Total property and equipment, net	269,439	273,221	$ 297,919
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	27,046	36,373
Land [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	89,130	89,130
Building [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	197,689	195,372
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	10,494	10,348
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	8,071	7,748
Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 31,102	$ 30,950