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Employee Benefits - Summary of Number of Awards and Movements for all Share Plans (Parenthetical) (Detail) - $ / shares
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
WEP [member]    
Disclosure of number and weighted average exercise prices of other equity instruments [line items]    
Share price on grant date $ 16.3 $ 15.17
Restricted Shares [member]    
Disclosure of number and weighted average exercise prices of other equity instruments [line items]    
Share price on grant date   20.18
Restricted Shares [member] | Bottom of range [member]    
Disclosure of number and weighted average exercise prices of other equity instruments [line items]    
Share price on grant date 19.2  
Restricted Shares [member] | Top of range [member]    
Disclosure of number and weighted average exercise prices of other equity instruments [line items]    
Share price on grant date 19.27  
Performance Rights [member] | Bottom of range [member]    
Disclosure of number and weighted average exercise prices of other equity instruments [line items]    
Share price on grant date 13.08 11.66
Performance Rights [member] | Top of range [member]    
Disclosure of number and weighted average exercise prices of other equity instruments [line items]    
Share price on grant date 13.71 14.44
SWEP [member]    
Disclosure of number and weighted average exercise prices of other equity instruments [line items]    
Share price on grant date $ 19.74 $ 0