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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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Property, Plant and Equipment [Line Items]        
Total depreciation and amortization expense $ 5,634 $ 5,852 $ 16,610 $ 17,528
Operating Expenses [Member]        
Property, Plant and Equipment [Line Items]        
Total depreciation and amortization expense 5,599 5,794 16,505 17,301
Corporate General and Administrative Expenses [Member]        
Property, Plant and Equipment [Line Items]        
Total depreciation and amortization expense $ 35 $ 58 $ 105 $ 227