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Net employee defined benefit - Summary of Employee Defined Benefit Plan (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Disclosure of net defined benefit asset (liability) [line items]    
Fair value of plan assets $ 25,783 $ 29,086
Employee benefits liability (40,115) (28,837)
Benefit (liability) assets (14,332) 249
Defined benefit obligation [member]    
Disclosure of net defined benefit asset (liability) [line items]    
Employee benefits liability (39,466) (28,195)
Other employee benefits [member]    
Disclosure of net defined benefit asset (liability) [line items]    
Employee benefits liability $ (649) $ (642)