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Employee Benefit Plans - Estimated Future Benefit Payments for Defined Benefit Pension and Postretirement Benefit Plans (Detail)
$ in Thousands
Dec. 31, 2020
USD ($)
Defined benefit pension plans  
Defined Benefit Plan Disclosure [Line Items]  
2021 $ 47,473
2022 37,067
2023 36,693
2024 39,266
2025 37,830
2026 - 2030 177,680
Postretirement benefit plans  
Defined Benefit Plan Disclosure [Line Items]  
2021 840
2022 740
2023 630
2024 630
2025 530
2026 - 2030 $ 1,930