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Basis of preparation and accounting policies - Disclosure of detailed information about right-of-use assets useful life (Detail)
 12 Months Ended
Dec. 31, 2022
Leasehold land [member] | Bottom of range [member]  
Disclosure of right of use assets [line items]  
Useful life right of use assets 3 years
Leasehold land [member] | Top of range [member]  
Disclosure of right of use assets [line items]  
Useful life right of use assets 50 years
Building and office space [member] | Bottom of range [member]  
Disclosure of right of use assets [line items]  
Useful life right of use assets 1 year
Building and office space [member] | Top of range [member]  
Disclosure of right of use assets [line items]  
Useful life right of use assets 6 years
Office Furniture, Fittings and Equipment [member]  
Disclosure of right of use assets [line items]  
Useful life right of use assets 5 years
Motor vehicles [member]  
Disclosure of right of use assets [line items]  
Useful life right of use assets 12 years