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Developed and Undeveloped Acreage (Including Both Leases and Concessions) Held (Detail) a in Thousands | Jun. 30, 2020 a
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Disclosure of oil and gas producing activities [line items] |
Developed acreage, Gross | 2,396
Developed acreage, Net | 916
Undeveloped acreage, Gross | 5,536
Undeveloped acreage, Net | 4,524
Australia [member] |
Disclosure of oil and gas producing activities [line items] |
Developed acreage, Gross | 2,152
Developed acreage, Net | 823
Undeveloped acreage, Gross | 766
Undeveloped acreage, Net | 279
United States [member] |
Disclosure of oil and gas producing activities [line items] |
Developed acreage, Gross | 98
Developed acreage, Net | 36
Undeveloped acreage, Gross | 844
Undeveloped acreage, Net | 800
Other countries [member] |
Disclosure of oil and gas producing activities [line items] |
Developed acreage, Gross | 146
Developed acreage, Net | 57
Undeveloped acreage, Gross | 3,926
Undeveloped acreage, Net | 3,445

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- Definition Area assigned to productive oil and gas wells with working interest ownership. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1208 -Paragraph (a) + Details
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- Definition Leased area with working interest ownership on which oil and gas wells have not been drilled or completed that would permit production of economic quantities of oil and gas. Excludes area of undrilled acreage held by production under terms of lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1208 -Paragraph (b) + Details
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- Definition Leased area representing summation of fractional ownership working interest to whole on which oil and gas wells have not been drilled or completed that would permit production of economic quantities of oil and gas. Excludes area of undrilled acreage held by production under terms of lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1208 -Paragraph (b) + Details
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