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Average number of employees - Summary of average number of employees (Detail) - Employee
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of average number of employees [Line Items]      
Average number of employees 46,007 47,458 46,807
Investment in equity accounted units [Member]      
Disclosure of average number of employees [Line Items]      
Average number of employees 3,139 3,129 3,108
Australia and New Zealand [Member]      
Disclosure of average number of employees [Line Items]      
Average number of employees 19,814 19,595 19,643
Australia and New Zealand [Member] | Investment in equity accounted units [Member]      
Disclosure of average number of employees [Line Items]      
Average number of employees 619 578 602
Canada [Member]      
Disclosure of average number of employees [Line Items]      
Average number of employees 11,576 10,620 10,256
Canada [Member] | Investment in equity accounted units [Member]      
Disclosure of average number of employees [Line Items]      
Average number of employees 0 0 0
UK [Member]      
Disclosure of average number of employees [Line Items]      
Average number of employees 190 287 309
UK [Member] | Investment in equity accounted units [Member]      
Disclosure of average number of employees [Line Items]      
Average number of employees 0 0 0
Europe [Member]      
Disclosure of average number of employees [Line Items]      
Average number of employees 959 1,418 1,505
Europe [Member] | Investment in equity accounted units [Member]      
Disclosure of average number of employees [Line Items]      
Average number of employees 0 0 0
Africa [Member]      
Disclosure of average number of employees [Line Items]      
Average number of employees 4,371 4,758 4,730
Africa [Member] | Investment in equity accounted units [Member]      
Disclosure of average number of employees [Line Items]      
Average number of employees 1,250 1,262 1,269
United States of America [Member]      
Disclosure of average number of employees [Line Items]      
Average number of employees 3,400 3,792 3,429
United States of America [Member] | Investment in equity accounted units [Member]      
Disclosure of average number of employees [Line Items]      
Average number of employees 0 0 0
Mongolia [Member]      
Disclosure of average number of employees [Line Items]      
Average number of employees 3,215 2,886 2,861
Mongolia [Member] | Investment in equity accounted units [Member]      
Disclosure of average number of employees [Line Items]      
Average number of employees 0 0 0
Indonesia [Member]      
Disclosure of average number of employees [Line Items]      
Average number of employees 0 1,615 1,642
Indonesia [Member] | Investment in equity accounted units [Member]      
Disclosure of average number of employees [Line Items]      
Average number of employees 0 0 0
South America [Member]      
Disclosure of average number of employees [Line Items]      
Average number of employees 1,513 1,499 1,434
South America [Member] | Investment in equity accounted units [Member]      
Disclosure of average number of employees [Line Items]      
Average number of employees 1,270 1,289 1,237
India [Member]      
Disclosure of average number of employees [Line Items]      
Average number of employees 272 288 310
India [Member] | Investment in equity accounted units [Member]      
Disclosure of average number of employees [Line Items]      
Average number of employees 0 0 0
Singapore [Member]      
Disclosure of average number of employees [Line Items]      
Average number of employees 430 422 434
Singapore [Member] | Investment in equity accounted units [Member]      
Disclosure of average number of employees [Line Items]      
Average number of employees 0 0 0
Other countries [Member]      
Disclosure of average number of employees [Line Items]      
Average number of employees 267 278 254
Other countries [Member] | Investment in equity accounted units [Member]      
Disclosure of average number of employees [Line Items]      
Average number of employees 0 0 0
Subsidiaries And Joint Operations [Member]      
Disclosure of average number of employees [Line Items]      
Average number of employees 42,868 44,329 43,699
Subsidiaries And Joint Operations [Member] | Australia and New Zealand [Member]      
Disclosure of average number of employees [Line Items]      
Average number of employees 19,195 19,017 19,041
Subsidiaries And Joint Operations [Member] | Canada [Member]      
Disclosure of average number of employees [Line Items]      
Average number of employees 11,576 10,620 10,256
Subsidiaries And Joint Operations [Member] | UK [Member]      
Disclosure of average number of employees [Line Items]      
Average number of employees 190 287 309
Subsidiaries And Joint Operations [Member] | Europe [Member]      
Disclosure of average number of employees [Line Items]      
Average number of employees 959 1,418 1,505
Subsidiaries And Joint Operations [Member] | Africa [Member]      
Disclosure of average number of employees [Line Items]      
Average number of employees 3,121 3,496 3,461
Subsidiaries And Joint Operations [Member] | United States of America [Member]      
Disclosure of average number of employees [Line Items]      
Average number of employees 3,400 3,792 3,429
Subsidiaries And Joint Operations [Member] | Mongolia [Member]      
Disclosure of average number of employees [Line Items]      
Average number of employees 3,215 2,886 2,861
Subsidiaries And Joint Operations [Member] | Indonesia [Member]      
Disclosure of average number of employees [Line Items]      
Average number of employees 0 1,615 1,642
Subsidiaries And Joint Operations [Member] | South America [Member]      
Disclosure of average number of employees [Line Items]      
Average number of employees 243 210 197
Subsidiaries And Joint Operations [Member] | India [Member]      
Disclosure of average number of employees [Line Items]      
Average number of employees 272 288 310
Subsidiaries And Joint Operations [Member] | Singapore [Member]      
Disclosure of average number of employees [Line Items]      
Average number of employees 430 422 434
Subsidiaries And Joint Operations [Member] | Other countries [Member]      
Disclosure of average number of employees [Line Items]      
Average number of employees 267 278 254