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Number of Productive Crude Oil and Natural Gas Wells in which we Held an Interest (Detail)	Jun. 30, 2018 Wells
Productive wells [Line Items]
Crude oil wells, Gross	1,411
Crude oil wells, Net	747
Natural gas wells, Gross	6,831
Natural gas wells, Net	2,068
Total, Gross	8,242
Total, Net	2,815
Australia [member]
Productive wells [Line Items]
Crude oil wells, Gross	354
Crude oil wells, Net	178
Natural gas wells, Gross	135
Natural gas wells, Net	48
Total, Gross	489
Total, Net	226
United States [member]
Productive wells [Line Items]
Crude oil wells, Gross	998
Crude oil wells, Net	547
Natural gas wells, Gross	6,660
Natural gas wells, Net	2,012
Total, Gross	7,658
Total, Net	2,559
Other countries [member]
Productive wells [Line Items]
Crude oil wells, Gross	59
Crude oil wells, Net	22
Natural gas wells, Gross	36
Natural gas wells, Net	8
Total, Gross	95
Total, Net	30

X

- Definition

The total number of producing wells and wells capable of production, in which the entity owns an undivided working interest.

+ References

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The total number of producing wells and wells capable of production, in which the entity owns a fractional working interest.

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- Definition

The total number of producing gas wells and gas wells capable of production, in which the entity owns an undivided working interest.

+ 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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