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Developed and Undeveloped Acreage (Including Both Leases and Concessions) Held (Detail) a in Thousands | Jun. 30, 2019 a
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Disclosure of oil and gas producing activities [line items] |
Developed acreage, Gross | 2,403
Developed acreage, Net | 919
Undeveloped acreage, Gross | 5,317
Undeveloped acreage, Net | 4,038
Australia [member] |
Disclosure of oil and gas producing activities [line items] |
Developed acreage, Gross | 2,152
Developed acreage, Net | 823
Undeveloped acreage, Gross | 963
Undeveloped acreage, Net | 393
United States [member] |
Disclosure of oil and gas producing activities [line items] |
Developed acreage, Gross | 105
Developed acreage, Net | 39
Undeveloped acreage, Gross | 828
Undeveloped acreage, Net | 776
Other countries [member] |
Disclosure of oil and gas producing activities [line items] |
Developed acreage, Gross | 146
Developed acreage, Net | 57
Undeveloped acreage, Gross | 3,526
Undeveloped acreage, Net | 2,869

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