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Retirement Plans and Other Postretirement Benefits - Summary of Benefit Payments Expected to be Paid (Detail)
$ in Thousands
Dec. 31, 2020
USD ($)
Retirement Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2021 $ 2,956
2022 2,985
2023 3,049
2024 3,063
2025 3,050
Years 2026-2030 15,336
Total 30,439
Other Post Retirement Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2021 94
2022 96
2023 102
2024 107
2025 109
Years 2026-2030 703
Total $ 1,211