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Pension and other post-retirement benefits - Fair Value of Investments by Asset Category (Detail) - Level 1 $ in Thousands	Dec. 31, 2023 USD ($)
Defined Benefit Plan Disclosure [Line Items]
2023	$ 804,610
Percentage	100.00%
Equity securities
Defined Benefit Plan Disclosure [Line Items]
2023	$ 376,158
Percentage	47.00%
Debt securities
Defined Benefit Plan Disclosure [Line Items]
2023	$ 377,272
Percentage	47.00%
Other
Defined Benefit Plan Disclosure [Line Items]
2023	$ 51,180
Percentage	6.00%

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

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