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Depreciation and Amortization - Depreciation and Amortization Expense for Property and Equipment and Intangible Assets (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Property, Plant and Equipment [Line Items]        
Total depreciation expense $ 5,677 $ 5,117 $ 16,359 $ 15,168
Operating Expenses [Member]        
Property, Plant and Equipment [Line Items]        
Total depreciation expense 5,569 5,000 16,021 14,847
Corporate General and Administrative Expenses [Member]        
Property, Plant and Equipment [Line Items]        
Total depreciation expense $ 108 $ 117 $ 338 $ 321