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Pension plans and other postretirement benefits - Net Periodic Defined Benefit Cost for Defined Benefit Plans (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 2,000 $ 3,000 $ 6,000 $ 8,000
Interest cost on projected benefit obligation 27,000 28,000 81,000 86,000
Expected return on plan assets (46,000) (50,000) (139,000) (151,000)
Amortization of prior service credit 0 0 0 0
Amortization of net actuarial gain (1,000) 0 (2,000) (1,000)
Net periodic benefit $ (18,000) $ (19,000) $ (54,000) $ (58,000)
Defined benefit plan, net periodic benefit cost (credit) excluding service cost, statement of income or comprehensive income [extensible enumeration] Other costs of operations Other costs of operations Other costs of operations Other costs of operations
Other Postretirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 0 $ 0 $ 1,000 $ 1,000
Interest cost on projected benefit obligation 1,000 1,000 2,000 2,000
Expected return on plan assets 0 0 0 0
Amortization of prior service credit (1,000) (1,000) (2,000) (2,000)
Amortization of net actuarial gain 0 (1,000) (2,000) (2,000)
Net periodic benefit $ 0 $ (1,000) $ (1,000) $ (1,000)
Defined benefit plan, net periodic benefit cost (credit) excluding service cost, statement of income or comprehensive income [extensible enumeration] Other costs of operations Other costs of operations Other costs of operations Other costs of operations