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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, 2023
Dec. 31, 2022
WEP [member]    
Disclosure of number and weighted average exercise prices of other equity instruments [line items]    
Share price on grant date $ 17.54 $ 16.3
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 23.33 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 23.48 19.27
Performance Rights [member]    
Disclosure of number and weighted average exercise prices of other equity instruments [line items]    
Share price on grant date 15.96  
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
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
SWEP [member]    
Disclosure of number and weighted average exercise prices of other equity instruments [line items]    
Share price on grant date $ 20.78 $ 19.74