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Other Noncurrent Liabilities - Summary of Other Noncurrent Liabilities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Other Liabilities Disclosure [Abstract]    
Reserve for uncertain tax positions $ 1,717 $ 1,717
OPEB 878 985
Insurance claims and expenses 617 653
Other 425 425
Total $ 3,637 $ 3,780