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Postretirement Benefits - Estimated Future Payments for Pension Benefits and Other Postretirement Benefit Plans (Detail) - Pension plan
$ in Thousands
Dec. 31, 2019
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 22,639
2021 24,448
2022 26,560
2023 28,371
2024 30,348
2025-2029 $ 173,848