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Net defined benefit assets (liability) - Summary of Components of Net Benefit Expense (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of net defined benefit asset (liability) [line items]      
Current service cost $ 2,725 $ 2,860 $ 3,272
Interest cost on net benefit obligation 74 250 249
Past service cost 13 16 191
Net periodic benefit cost (income) 2,812 3,126 3,712
Defined benefit obligation      
Disclosure of net defined benefit asset (liability) [line items]      
Current service cost 2,725 2,860 3,272
Interest cost on net benefit obligation 1,715 972 721
Past service cost 13 16 191
Net periodic benefit cost (income) 4,453 3,848 4,184
Fair value of assets      
Disclosure of net defined benefit asset (liability) [line items]      
Current service cost 0 0 0
Interest cost on net benefit obligation (1,641) (722) (472)
Past service cost 0 0 0
Net periodic benefit cost (income) $ (1,641) $ (722) $ (472)