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Pensions and Postretirement Benefits Other than Pensions - Estimated Benefit Payments for Domestic and Foreign Pension Plans and Other Postretirement Benefit Plans (Detail)
$ in Thousands
Dec. 31, 2019
USD ($)
Pension Plan  
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 86,944
2021 86,886
2022 88,845
2023 88,431
2024 89,937
2025 through 2029 448,531
Other Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2020 14,334
2021 14,557
2022 14,697
2023 14,748
2024 14,852
2025 through 2029 $ 72,251