Property and Equipment - Summary of Property and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property and equipment	$ 812,562	$ 591,383
Less accumulated depreciation and amortization	(145,079)	(113,213)
Property and equipment, net	667,483	478,170
Land [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	103,280	76,537
Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	13,389	8,800
Buildings [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	392,754	298,124
Building and Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	72,494	45,855
Equipment under Capital Leases [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	6,467	5,310
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	91,225	75,990
Furniture, Fixtures and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	51,352	38,162
Internally Developed Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	25,996	20,813
Other [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	1,099	1,099
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	$ 54,506	$ 20,693