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Commitments and Contingencies - Schedule of Accrued General Insurance Reserves (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]    
Included in other current liabilities $ 2,029 $ 2,033
Included in other long-term liabilities 7,787 7,073
Total $ 9,816 $ 9,106