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Benefit Plans - Anticipated Future Postretirement Benefit Payments (Detail) - Postretirement Benefits
$ in Thousands
Dec. 31, 2020
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2021 $ 2,886
2022 2,983
2023 3,151
2024 3,341
2025 3,494
2026 - 2030 $ 19,300