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Net employee defined benefit - Summary of Components of Net Benefit Expense (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of net defined benefit asset (liability) [line items]      
Current service cost $ 2,393 $ 2,192 $ 2,105
Interest cost on net benefit obligation (25) (92) (24)
Past service cost 457    
Curtailment / Settlement (2,026)    
Net benefit expense 799 2,100 2,081
Defined benefit obligation [member]      
Disclosure of net defined benefit asset (liability) [line items]      
Current service cost 2,393 2,192 2,105
Interest cost on net benefit obligation 706 887 642
Past service cost 457    
Curtailment / Settlement (2,026)    
Net benefit expense 1,530 3,079 2,747
Fair value of assets [member]      
Disclosure of net defined benefit asset (liability) [line items]      
Current service cost 0 0 0
Interest cost on net benefit obligation (731) (979) (666)
Past service cost 0    
Curtailment / Settlement 0    
Net benefit expense $ (731) $ (979) $ (666)