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Estimated Future Benefit Payments (Detail)
$ in Thousands
Dec. 31, 2019
USD ($)
Pension Plans  
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 6,706
2021 7,192
2022 6,903
2023 7,687
2024 8,622
2025 - 2029 49,511
Other Postretirement Benefit Plans, Defined Benefit  
Defined Benefit Plan Disclosure [Line Items]  
2020 2,774
2021 3,035
2022 3,167
2023 3,341
2024 3,622
2025 - 2029 21,761
Supplemental Employee Retirement Plans, Defined Benefit  
Defined Benefit Plan Disclosure [Line Items]  
2020 653
2021 653
2022 651
2023 650
2024 648
2025 - 2029 $ 6,037