Property and Equipment, Net - Components of Property and Equipment, Net (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Property Plant And Equipment [Line Items]
Total property and equipment, gross	$ 80,239	$ 365,029
Less: Accumulated depreciation	(62,196)	(98,472)
Total property and equipment, net	18,043	266,557
Computer Equipment [Member]
Property Plant And Equipment [Line Items]
Total property and equipment, gross	22,451	20,624
Software [Member]
Property Plant And Equipment [Line Items]
Total property and equipment, gross	35,224	34,937
Land [Member]
Property Plant And Equipment [Line Items]
Total property and equipment, gross		89,130
Building and Building Improvements [Member]
Property Plant And Equipment [Line Items]
Total property and equipment, gross		203,873
Furniture and Fixtures [Member]
Property Plant And Equipment [Line Items]
Total property and equipment, gross	11,203	10,321
Leasehold Improvements [Member]
Property Plant And Equipment [Line Items]
Total property and equipment, gross	$ 11,361	$ 6,144