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Commitments and Contingencies - Schedule of Accrued General Insurance Reserves (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]    
Included in other current liabilities $ 1,914 $ 1,848
Included in other long-term liabilities 9,803 6,608
Total $ 11,717 $ 8,456