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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

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