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Net employee defined benefit - Summary of Expected Contribution Payments to Defined Benefit Plan (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of defined benefit plans [line items]    
Total expected payments $ 25,188 $ 33,226
Up to one year [member]    
Disclosure of defined benefit plans [line items]    
Total expected payments 2,299 5,169
More than one year but less than five years [member]    
Disclosure of defined benefit plans [line items]    
Total expected payments 8,777 14,008
Over five years [member]    
Disclosure of defined benefit plans [line items]    
Total expected payments $ 14,112 $ 14,049