Property and Equipment - Schedule of Costs and Related Accumulated Depreciation and Amortization of Major Classes of Property (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 174,895	$ 157,400
Less: accumulated depreciation and amortization	(81,884)	(75,310)
Property and equipment, net	93,011	82,090
Land [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	12,323	12,323
Buildings and Improvements [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	99,150	92,834
Other Property and Equipment [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	53,342	49,890
Construction in Progress [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 10,080	$ 2,353