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Developed and Undeveloped Acreage (Including Both Leases and Concessions) Held (Detail) a in Thousands	Jun. 30, 2020 a
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

Disclosure of oil and gas producing activities.

+ References

No definition available.

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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
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Area assigned to productive oil and gas wells representing summation of fractional ownership working interest to whole.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher SEC
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-Number 229
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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
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-Number 229
-Section 1208
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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

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