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Average number of employees - Summary of average number of employees (Detail) - employee
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of average number of employees [Line Items]      
Average number of employees 49,345 47,474 46,007
Australia and New Zealand      
Disclosure of average number of employees [Line Items]      
Average number of employees 22,509 21,116 19,814
Canada      
Disclosure of average number of employees [Line Items]      
Average number of employees 12,270 11,814 11,576
UK      
Disclosure of average number of employees [Line Items]      
Average number of employees 189 172 190
Europe      
Disclosure of average number of employees [Line Items]      
Average number of employees 1,003 1,020 959
Africa      
Disclosure of average number of employees [Line Items]      
Average number of employees 3,737 3,773 4,371
US      
Disclosure of average number of employees [Line Items]      
Average number of employees 3,471 3,543 3,400
Mongolia      
Disclosure of average number of employees [Line Items]      
Average number of employees 3,513 3,465 3,215
South America      
Disclosure of average number of employees [Line Items]      
Average number of employees 1,566 1,513 1,513
India      
Disclosure of average number of employees [Line Items]      
Average number of employees 354 324 272
Singapore      
Disclosure of average number of employees [Line Items]      
Average number of employees 450 456 430
Other countries      
Disclosure of average number of employees [Line Items]      
Average number of employees 283 278 267
Investment in equity accounted units      
Disclosure of average number of employees [Line Items]      
Average number of employees 3,254 3,141 3,139
Investment in equity accounted units | Australia and New Zealand      
Disclosure of average number of employees [Line Items]      
Average number of employees 648 634 619
Investment in equity accounted units | Canada      
Disclosure of average number of employees [Line Items]      
Average number of employees 0 0 0
Investment in equity accounted units | UK      
Disclosure of average number of employees [Line Items]      
Average number of employees 0 0 0
Investment in equity accounted units | Europe      
Disclosure of average number of employees [Line Items]      
Average number of employees 0 0 0
Investment in equity accounted units | Africa      
Disclosure of average number of employees [Line Items]      
Average number of employees 1,253 1,214 1,250
Investment in equity accounted units | US      
Disclosure of average number of employees [Line Items]      
Average number of employees 0 0 0
Investment in equity accounted units | Mongolia      
Disclosure of average number of employees [Line Items]      
Average number of employees 0 0 0
Investment in equity accounted units | South America      
Disclosure of average number of employees [Line Items]      
Average number of employees 1,353 1,293 1,270
Investment in equity accounted units | India      
Disclosure of average number of employees [Line Items]      
Average number of employees 0 0 0
Investment in equity accounted units | Singapore      
Disclosure of average number of employees [Line Items]      
Average number of employees 0 0 0
Investment in equity accounted units | Other countries      
Disclosure of average number of employees [Line Items]      
Average number of employees 0 0 0
Subsidiaries and joint operations      
Disclosure of average number of employees [Line Items]      
Average number of employees 46,091 44,333 42,868
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 21,861 20,482 19,195
Subsidiaries and joint operations | Canada      
Disclosure of average number of employees [Line Items]      
Average number of employees 12,270 11,814 11,576
Subsidiaries and joint operations | UK      
Disclosure of average number of employees [Line Items]      
Average number of employees 189 172 190
Subsidiaries and joint operations | Europe      
Disclosure of average number of employees [Line Items]      
Average number of employees 1,003 1,020 959
Subsidiaries and joint operations | Africa      
Disclosure of average number of employees [Line Items]      
Average number of employees 2,484 2,559 3,121
Subsidiaries and joint operations | US      
Disclosure of average number of employees [Line Items]      
Average number of employees 3,471 3,543 3,400
Subsidiaries and joint operations | Mongolia      
Disclosure of average number of employees [Line Items]      
Average number of employees 3,513 3,465 3,215
Subsidiaries and joint operations | South America      
Disclosure of average number of employees [Line Items]      
Average number of employees 213 220 243
Subsidiaries and joint operations | India      
Disclosure of average number of employees [Line Items]      
Average number of employees 354 324 272
Subsidiaries and joint operations | Singapore      
Disclosure of average number of employees [Line Items]      
Average number of employees 450 456 430
Subsidiaries and joint operations | Other countries      
Disclosure of average number of employees [Line Items]      
Average number of employees 283 278 267