XML 78 R204.htm IDEA: XBRL DOCUMENT v3.19.2
Number of Productive Crude Oil and Natural Gas Wells in which we Held an Interest (Detail)
Jun. 30, 2019
Wells
Disclosure of productive wells [line items]  
Crude oil wells, Gross 469
Crude oil wells, Net 222
Natural gas wells, Gross 161
Natural gas wells, Net 57
Total, Gross 630
Total, Net 279
Australia [member]  
Disclosure of productive wells [line items]  
Crude oil wells, Gross 352
Crude oil wells, Net 176
Natural gas wells, Gross 153
Natural gas wells, Net 53
Total, Gross 505
Total, Net 229
United States [member]  
Disclosure of productive wells [line items]  
Crude oil wells, Gross 60
Crude oil wells, Net 25
Total, Gross 60
Total, Net 25
Other countries [member]  
Disclosure of productive wells [line items]  
Crude oil wells, Gross 57
Crude oil wells, Net 21
Natural gas wells, Gross 8
Natural gas wells, Net 4
Total, Gross 65
Total, Net 25