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Employee Benefits - Summary of Workers' Compensation Known Claims and IBNR Reserves (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Employee-related Liabilities [Abstract] |  |
Included in other current liabilities | $ 5,276 | $ 5,899
Included in other long-term liabilities | 10,190 | 8,721
Workers' Compensation Liability | $ 15,466 | $ 14,620

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