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Pension Plans and Postretirement Benefits - Cash Flows (Detail)
$ in Thousands
Dec. 31, 2023
USD ($)
United States: | Pension Plan  
Expected employer contributions to trusts of defined benefit plans:  
2024 $ 526
Expected benefit payments:  
2024 64,254
2025 65,457
2026 66,333
2027 67,009
2028 67,288
2029-2033 332,253
United States: | Other Benefits  
Expected employer contributions to trusts of defined benefit plans:  
2024 0
Expected benefit payments:  
2024 2,542
2025 2,570
2026 2,497
2027 2,458
2028 2,398
2029-2033 11,209
Canada  
Expected employer contributions to trusts of defined benefit plans:  
2024 1,008
Canada | Pension Plan  
Expected benefit payments:  
2024 917
2025 1,076
2026 1,216
2027 1,373
2028 1,471
2029-2033 8,648
Canada | Other Benefits  
Expected benefit payments:  
2024 595
2025 640
2026 700
2027 737
2028 772
2029-2033 $ 3,875