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Number of Productive Crude Oil and Natural Gas Wells in which we Held an Interest (Detail)
Jun. 30, 2021
Wells
Disclosure of productive wells [line items]  
Crude oil wells, Gross 450
Crude oil wells, Net 216
Natural gas wells, Gross 184
Natural gas wells, Net 70
Total, Gross 634
Total, Net 286
Australia [member]  
Disclosure of productive wells [line items]  
Crude oil wells, Gross 334
Crude oil wells, Net 166
Natural gas wells, Gross 176
Natural gas wells, Net 66
Total, Gross 510
Total, Net 232
United States [member]  
Disclosure of productive wells [line items]  
Crude oil wells, Gross 55
Crude oil wells, Net 27
Total, Gross 55
Total, Net 27
Other countries [member]  
Disclosure of productive wells [line items]  
Crude oil wells, Gross 61
Crude oil wells, Net 23
Natural gas wells, Gross 8
Natural gas wells, Net 4
Total, Gross 69
Total, Net 27