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Employee Benefits - Summary of Workers' Compensation Known Claims and IBNR Reserves (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Employee-related Liabilities [Abstract]    
Included in other current liabilities $ 6,066 $ 5,899
Included in other long-term liabilities 8,018 8,721
Workers' Compensation Liability $ 14,084 $ 14,620