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Net defined benefit assets (liabilities) - Summary of Reconciliation of Net Employee Defined Benefit Liabilities (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of net defined benefit asset (liability) [line items]      
Beginning balance $ 1,058 $ 5,346 $ 504
Current service cost (3,452) (2,690) (2,725)
Interest (cost) income (161) 190 (74)
Past service cost   (62) (13)
Return on plan assets 486 (335) (251)
Experience gain (loss) 139 (440) 80
Actuarial changes arising from changes in financial assumptions (815) (5,633) 2,295
Employer contributions 5,129 4,875 4,572
Benefits paid 841 (178) 970
Others (4) (15) (12)
Ending balance 3,221 1,058 5,346
Defined benefit obligation      
Disclosure of net defined benefit asset (liability) [line items]      
Beginning balance (41,042) (31,440) (30,332)
Current service cost (3,452) (2,690) (2,725)
Interest (cost) income (1,948) (2,015) (1,715)
Past service cost   (62) (13)
Return on plan assets 0 0 0
Experience gain (loss) 139 (440) 80
Actuarial changes arising from changes in financial assumptions (815) (5,633) 2,295
Employer contributions 0 0 0
Benefits paid 1,996 1,238 970
Others 0 0 0
Ending balance (45,122) (41,042) (31,440)
Fair value of assets      
Disclosure of net defined benefit asset (liability) [line items]      
Beginning balance 42,488 37,159 31,197
Current service cost 0 0 0
Interest (cost) income 1,787 2,205 1,641
Past service cost   0 0
Return on plan assets 486 (335) (251)
Experience gain (loss) 0 0 0
Actuarial changes arising from changes in financial assumptions 0 0 0
Employer contributions 5,129 4,875 4,572
Benefits paid (1,155) (1,416) 0
Others 0 0 0
Ending balance 48,735 42,488 37,159
Other employee benefits liability      
Disclosure of net defined benefit asset (liability) [line items]      
Beginning balance (388) (373) (361)
Current service cost 0 0 0
Interest (cost) income 0 0 0
Past service cost   0 0
Return on plan assets 0 0
Experience gain (loss) 0 0 0
Actuarial changes arising from changes in financial assumptions 0 0 0
Employer contributions 0 0 0
Benefits paid 0 0 0
Others (4) (15) (12)
Ending balance $ (392) $ (388) $ (373)