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Employee Benefits - Summary of Workers' Compensation Known Claims and IBNR Reserves (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Employee-related Liabilities [Abstract]    
Included in other current liabilities $ 5,201 $ 5,795
Included in other long-term liabilities 11,138 9,447
Workers' Compensation Liability $ 16,339 $ 15,242