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Retirement Plans and Other Post-Retirement Benefits - Summary of Benefit Payments Expected to be Made under Non-Qualified Pension Plans and Other Benefit Plans (Detail)
$ in Thousands
Dec. 31, 2020
USD ($)
Pension Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2021 $ 2,271
2022 2,210
2023 2,147
2024 2,082
2025 2,020
2026 through 2030 16,972
Other Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2021 1,167
2022 852
2023 626
2024 495
2025 460
2026 through 2030 $ 1,399