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Developed and Undeveloped Acreage (Including Both Leases and Concessions) Held (Detail) a in Thousands	Jun. 30, 2018 a
Gas and oil acreage [Line Items]
Developed acreage, Gross	3,464
Developed acreage, Net	1,556
Undeveloped acreage, Gross	8,668
Undeveloped acreage, Net	6,027
Australia [member]
Gas and oil acreage [Line Items]
Developed acreage, Gross	2,152
Developed acreage, Net	823
Undeveloped acreage, Gross	4,326
Undeveloped acreage, Net	2,605
United States [member]
Gas and oil acreage [Line Items]
Developed acreage, Gross	1,137
Developed acreage, Net	669
Undeveloped acreage, Gross	1,313
Undeveloped acreage, Net	1,085
Other countries [member]
Gas and oil acreage [Line Items]
Developed acreage, Gross	175
Developed acreage, Net	64
Undeveloped acreage, Gross	3,029
Undeveloped acreage, Net	2,337

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Area spaced or assigned to productive wells in which a working interest is owned.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1208
-Paragraph (a)

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Fractional interest owned based on working interests or other economic arrangements of area spaced or assigned to productive wells.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1208
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Lease area in which a working interest is owned and on which wells have not been drilled or completed to a point that would permit the production of commercial quantities of oil and gas regardless of whether or not such area contains proved reserves.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Section 1208
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Fractional interest owned based on working interests or other economic arrangements of lease area on which wells have not been drilled or completed to a point that would permit the production of commercial quantities of oil and gas regardless of whether or not such area contains proved reserves.

+ References

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