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Loans and other borrowings - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about borrowings [line items]      
Maximum amount drawn $ 75,000,000 $ 0 $ 0
Revolving Credit Facilities      
Disclosure of detailed information about borrowings [line items]      
Line of credit facility maximum borrowings capacity 1,500,000,000    
Utilised facilities 0 0  
Maximum amount drawn 75,000,000 0  
Unutilised facilities provided by banks 0 $ 0  
Credit facility cancelled during the year $ 1,350,000,000