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Employee Benefits - Summary of Workers' Compensation Known Claims and IBNR Reserves (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Employee-related Liabilities [Abstract]    
Included in other current liabilities $ 6,341 $ 6,777
Included in other long-term liabilities 12,575 10,874
Workers' Compensation Liability $ 18,916 $ 17,651