Developed and Undeveloped Acreage (Including Both Leases and Concessions) Held (Detail) a in Thousands |
Jun. 30, 2021
a
|
|---|---|
| Disclosure of oil and gas producing activities [line items] | |
| Developed acreage, Gross | 2,675 |
| Developed acreage, Net | 1,005 |
| Undeveloped acreage, Gross | 4,188 |
| Undeveloped acreage, Net | 3,591 |
| Australia [member] | |
| Disclosure of oil and gas producing activities [line items] | |
| Developed acreage, Gross | 2,423 |
| Developed acreage, Net | 897 |
| Undeveloped acreage, Gross | 391 |
| Undeveloped acreage, Net | 148 |
| United States [member] | |
| Disclosure of oil and gas producing activities [line items] | |
| Developed acreage, Gross | 92 |
| Developed acreage, Net | 41 |
| Undeveloped acreage, Gross | 403 |
| Undeveloped acreage, Net | 339 |
| Other countries [member] | |
| Disclosure of oil and gas producing activities [line items] | |
| Developed acreage, Gross | 160 |
| Developed acreage, Net | 67 |
| Undeveloped acreage, Gross | 3,394 |
| Undeveloped acreage, Net | 3,104 |