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Commitments and Contingencies - Schedule of Accrued General Insurance Reserves (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]    
Included in other current liabilities $ 2,033 $ 1,949
Included in other long-term liabilities 7,073 7,104
Total $ 9,106 $ 9,053