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Commitments and Contingencies - Schedule of Accrued General Insurance Reserves (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]    
Included in other current liabilities $ 2,514 $ 1,848
Included in other long-term liabilities 12,511 6,608
Total $ 15,025 $ 8,456