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Net defined benefit assets (liabilities) - Summary of Additional Information about Sensitivity Analysis for Actuarial Assumptions (Detail) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of sensitivity analysis for actuarial assumptions [line items]      
Percentage of reasonably possible increase in actuarial assumption 0.50% 0.50% 0.50%
Percentage of reasonably possible decrease in actuarial assumption 0.50% 0.50% 0.50%
Discount rate (0.5% movement)      
Disclosure of sensitivity analysis for actuarial assumptions [line items]      
Increase $ 1,989 $ 1,832 $ 1,296
Decrease $ (2,159) $ (1,989) $ (1,400)