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Pension and other post-retirement benefits - Expected Benefit Payments (Detail)
$ in Thousands
Dec. 31, 2023
USD ($)
Pension plan  
Defined Benefit Plan Disclosure [Line Items]  
2024 $ 48,271
2025 49,652
2026 49,389
2027 50,443
2028 50,751
2029-2033 255,465
OPEB  
Defined Benefit Plan Disclosure [Line Items]  
2024 11,718
2025 12,303
2026 12,623
2027 13,105
2028 13,487
2029-2033 $ 71,230