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Employee Benefit - Maturity Profile of Defined Benefit Obligation (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of defined benefit plans [Line Items]    
Expected payments $ 25,106 $ 25,137
Weighted average duration of defined benefit obligation   9 years
Bottom of range [Member]    
Disclosure of defined benefit plans [Line Items]    
Weighted average duration of defined benefit obligation 9 years  
Top of range [Member]    
Disclosure of defined benefit plans [Line Items]    
Weighted average duration of defined benefit obligation 10 years  
Within one year [Member]    
Disclosure of defined benefit plans [Line Items]    
Expected payments $ 1,384 $ 1,340
Between 2 and 5 years [Member]    
Disclosure of defined benefit plans [Line Items]    
Expected payments 2,040 2,489
Between 6 and 10 years [Member]    
Disclosure of defined benefit plans [Line Items]    
Expected payments 4,568 4,391
Beyond 10 years [Member]    
Disclosure of defined benefit plans [Line Items]    
Expected payments $ 17,114 $ 16,917