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Average number of employees - Summary of average number of employees (Detail) - Employee
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of average number of employees [Line Items]      
Average number of employees 47,474 46,007 47,458
Investment in equity accounted units      
Disclosure of average number of employees [Line Items]      
Average number of employees 3,141 3,139 3,129
Australia and New Zealand      
Disclosure of average number of employees [Line Items]      
Average number of employees 21,116 19,814 19,595
Australia and New Zealand | Investment in equity accounted units      
Disclosure of average number of employees [Line Items]      
Average number of employees 634 619 578
Canada      
Disclosure of average number of employees [Line Items]      
Average number of employees 11,814 11,576 10,620
Canada | Investment in equity accounted units      
Disclosure of average number of employees [Line Items]      
Average number of employees 0 0 0
UK      
Disclosure of average number of employees [Line Items]      
Average number of employees 172 190 287
UK | Investment in equity accounted units      
Disclosure of average number of employees [Line Items]      
Average number of employees 0 0 0
Europe      
Disclosure of average number of employees [Line Items]      
Average number of employees 1,020 959 1,418
Europe | Investment in equity accounted units      
Disclosure of average number of employees [Line Items]      
Average number of employees 0 0 0
Africa      
Disclosure of average number of employees [Line Items]      
Average number of employees 3,773 4,371 4,758
Africa | Investment in equity accounted units      
Disclosure of average number of employees [Line Items]      
Average number of employees 1,214 1,250 1,262
United States of America      
Disclosure of average number of employees [Line Items]      
Average number of employees 3,543 3,400 3,792
United States of America | Investment in equity accounted units      
Disclosure of average number of employees [Line Items]      
Average number of employees 0 0 0
Mongolia      
Disclosure of average number of employees [Line Items]      
Average number of employees 3,465 3,215 2,886
Mongolia | Investment in equity accounted units      
Disclosure of average number of employees [Line Items]      
Average number of employees 0 0 0
Indonesia      
Disclosure of average number of employees [Line Items]      
Average number of employees 0 0 1,615
Indonesia | Investment in equity accounted units      
Disclosure of average number of employees [Line Items]      
Average number of employees 0 0 0
South America      
Disclosure of average number of employees [Line Items]      
Average number of employees 1,513 1,513 1,499
South America | Investment in equity accounted units      
Disclosure of average number of employees [Line Items]      
Average number of employees 1,293 1,270 1,289
India      
Disclosure of average number of employees [Line Items]      
Average number of employees 324 272 288
India | Investment in equity accounted units      
Disclosure of average number of employees [Line Items]      
Average number of employees 0 0 0
Singapore      
Disclosure of average number of employees [Line Items]      
Average number of employees 456 430 422
Singapore | Investment in equity accounted units      
Disclosure of average number of employees [Line Items]      
Average number of employees 0 0 0
Other countries      
Disclosure of average number of employees [Line Items]      
Average number of employees 278 267 278
Other countries | Investment in equity accounted units      
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 44,333 42,868 44,329
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 20,482 19,195 19,017
Subsidiaries and joint operations | Canada      
Disclosure of average number of employees [Line Items]      
Average number of employees 11,814 11,576 10,620
Subsidiaries and joint operations | UK      
Disclosure of average number of employees [Line Items]      
Average number of employees 172 190 287
Subsidiaries and joint operations | Europe      
Disclosure of average number of employees [Line Items]      
Average number of employees 1,020 959 1,418
Subsidiaries and joint operations | Africa      
Disclosure of average number of employees [Line Items]      
Average number of employees 2,559 3,121 3,496
Subsidiaries and joint operations | United States of America      
Disclosure of average number of employees [Line Items]      
Average number of employees 3,543 3,400 3,792
Subsidiaries and joint operations | Mongolia      
Disclosure of average number of employees [Line Items]      
Average number of employees 3,465 3,215 2,886
Subsidiaries and joint operations | Indonesia      
Disclosure of average number of employees [Line Items]      
Average number of employees 0 0 1,615
Subsidiaries and joint operations | South America      
Disclosure of average number of employees [Line Items]      
Average number of employees 220 243 210
Subsidiaries and joint operations | India      
Disclosure of average number of employees [Line Items]      
Average number of employees 324 272 288
Subsidiaries and joint operations | Singapore      
Disclosure of average number of employees [Line Items]      
Average number of employees 456 430 422
Subsidiaries and joint operations | Other countries      
Disclosure of average number of employees [Line Items]      
Average number of employees 278 267 278