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Average number of employees (Detail) - employee
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Equity accounted units      
Disclosure of average number of employees [Line Items]      
Average number of employees (in employees) 4,033 3,403 3,305
Equity accounted units | Australia and New Zealand      
Disclosure of average number of employees [Line Items]      
Average number of employees (in employees) 858 725 704
Equity accounted units | Canada      
Disclosure of average number of employees [Line Items]      
Average number of employees (in employees) 50 5 0
Equity accounted units | UK      
Disclosure of average number of employees [Line Items]      
Average number of employees (in employees) 0 0 0
Equity accounted units | Europe      
Disclosure of average number of employees [Line Items]      
Average number of employees (in employees) 24 25 0
Equity accounted units | Africa      
Disclosure of average number of employees [Line Items]      
Average number of employees (in employees) 1,293 1,176 1,218
Equity accounted units | US      
Disclosure of average number of employees [Line Items]      
Average number of employees (in employees) 311 58 0
Equity accounted units | Mongolia      
Disclosure of average number of employees [Line Items]      
Average number of employees (in employees) 0 0 0
Equity accounted units | South America      
Disclosure of average number of employees [Line Items]      
Average number of employees (in employees) 1,497 1,414 1,383
Equity accounted units | India      
Disclosure of average number of employees [Line Items]      
Average number of employees (in employees) 0 0 0
Equity accounted units | Singapore      
Disclosure of average number of employees [Line Items]      
Average number of employees (in employees) 0 0 0
Equity accounted units | Other countries      
Disclosure of average number of employees [Line Items]      
Average number of employees (in employees) 0 0 0
Subsidiaries and joint operations      
Disclosure of average number of employees [Line Items]      
Average number of employees (in employees) 55,561 53,771 50,421
Percent of employees of subsidiary companies 100.00%    
Subsidiaries and joint operations | Australia and New Zealand      
Disclosure of average number of employees [Line Items]      
Average number of employees (in employees) 25,098 25,045 23,829
Subsidiaries and joint operations | Canada      
Disclosure of average number of employees [Line Items]      
Average number of employees (in employees) 14,157 13,864 13,344
Subsidiaries and joint operations | UK      
Disclosure of average number of employees [Line Items]      
Average number of employees (in employees) 366 323 202
Subsidiaries and joint operations | Europe      
Disclosure of average number of employees [Line Items]      
Average number of employees (in employees) 875 912 994
Subsidiaries and joint operations | Africa      
Disclosure of average number of employees [Line Items]      
Average number of employees (in employees) 3,567 3,180 2,797
Subsidiaries and joint operations | US      
Disclosure of average number of employees [Line Items]      
Average number of employees (in employees) 4,113 3,973 3,655
Subsidiaries and joint operations | Mongolia      
Disclosure of average number of employees [Line Items]      
Average number of employees (in employees) 4,962 4,700 4,175
Subsidiaries and joint operations | South America      
Disclosure of average number of employees [Line Items]      
Average number of employees (in employees) 449 389 286
Subsidiaries and joint operations | India      
Disclosure of average number of employees [Line Items]      
Average number of employees (in employees) 1,183 611 396
Subsidiaries and joint operations | Singapore      
Disclosure of average number of employees [Line Items]      
Average number of employees (in employees) 486 469 454
Subsidiaries and joint operations | Other countries      
Disclosure of average number of employees [Line Items]      
Average number of employees (in employees) 305 305 289