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Pension Plans and Postretirement Benefits - Cash Flows (Detail)
$ in Thousands
Dec. 31, 2020
USD ($)
UNITED STATES | Pension Plan  
Expected employer contributions to trusts of defined benefit plans:  
Expected benefit payments, 2020 $ 0
Expected benefit payments:  
Expected benefit payments, 2020 59,656
Expected benefit payments, 2021 61,903
Expected benefit payments, 2022 63,795
Expected benefit payments, 2023 65,255
Expected benefit payments, 2024 66,330
Expected benefit payments, 2025-2029 336,783
UNITED STATES | Other Benefits  
Expected employer contributions to trusts of defined benefit plans:  
Expected benefit payments, 2020 90
Expected benefit payments:  
Expected benefit payments, 2020 2,736
Expected benefit payments, 2021 2,812
Expected benefit payments, 2022 2,819
Expected benefit payments, 2023 2,841
Expected benefit payments, 2024 2,827
Expected benefit payments, 2025-2029 12,950
Canada  
Expected employer contributions to trusts of defined benefit plans:  
Expected benefit payments, 2020 1,827
Canada | Pension Plan  
Expected benefit payments:  
Expected benefit payments, 2020 7,007
Expected benefit payments, 2021 7,237
Expected benefit payments, 2022 7,353
Expected benefit payments, 2023 7,469
Expected benefit payments, 2024 7,578
Expected benefit payments, 2025-2029 38,756
Canada | Other Benefits  
Expected benefit payments:  
Expected benefit payments, 2020 507
Expected benefit payments, 2021 509
Expected benefit payments, 2022 539
Expected benefit payments, 2023 549
Expected benefit payments, 2024 578
Expected benefit payments, 2025-2029 $ 3,322