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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

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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.

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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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