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Pension and other post-retirement benefits - Expected Benefit Payments (Detail)
$ in Thousands
Dec. 31, 2022
USD ($)
Pension plan  
Defined Benefit Plan Disclosure [Line Items]  
2023 $ 48,174
2024 47,428
2025 49,794
2026 50,585
2027 50,433
2028-2032 259,082
OPEB  
Defined Benefit Plan Disclosure [Line Items]  
2023 11,483
2024 12,025
2025 12,548
2026 12,925
2027 13,479
2028-2032 $ 72,684