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Estimated Future Benefit Payments (Detail) $ in Thousands | Dec. 31, 2020 USD ($)
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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

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