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Estimated Future Benefit Payments (Detail)
$ in Thousands
Dec. 31, 2020
USD ($)
Pension Plans  
Defined Benefit Plan Disclosure [Line Items]  
2021 $ 7,150
2022 7,051
2023 7,864
2024 8,532
2025 8,648
2026 — 2030 52,765
Other Postretirement Benefit Plans, Defined Benefit  
Defined Benefit Plan Disclosure [Line Items]  
2021 2,948
2022 3,066
2023 3,235
2024 3,418
2025 3,704
2026 — 2030 21,958
Supplemental Employee Retirement Plans, Defined Benefit  
Defined Benefit Plan Disclosure [Line Items]  
2021 637
2022 636
2023 635
2024 634
2025 1,182
2026 — 2030 $ 6,258