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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | $ 2,000 | $ 3,000 | $ 4,000 | $ 5,000
Interest cost on projected benefit obligation | 27,000 | 29,000 | 54,000 | 58,000
Expected return on plan assets | (47,000) | (50,000) | (93,000) | (101,000)
Amortization of prior service credit | 0 | 0 | 0 | 0
Amortization of net actuarial gain | 0 | (1,000) | (1,000) | (1,000)
Net periodic benefit | $ (18,000) | $ (19,000) | $ (36,000) | $ (39,000)
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 | $ 1,000 | $ 1,000 | $ 1,000 | $ 1,000
Interest cost on projected benefit obligation | 0 | 0 | 1,000 | 1,000
Expected return on plan assets | 0 | 0 | 0 | 0
Amortization of prior service credit | (1,000) | (1,000) | (1,000) | (1,000)
Amortization of net actuarial gain | (1,000) | 0 | (2,000) | (1,000)
Net periodic benefit | $ (1,000) | $ 0 | $ (1,000) | $ 0
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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