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Derivative Instruments - Schedule of Outstanding Commodity Derivative Instruments (Detail) $ in Thousands	Sep. 30, 2015 USD ($) MBbls $ / bbl
Derivative [Line Items]
Fair value asset (liability) | $	$ 135,356
2015 Two-Way Collars [Member]
Derivative [Line Items]
Total notional amount of oil (barrels) | MBbls	455
Average floor price (in dollars per barrel)	86.00
Average ceiling price (in dollars per barrel)	103.42
Fair value asset (liability) | $	$ 18,790
2015 Swaps [Member]
Derivative [Line Items]
Total notional amount of oil (barrels) | MBbls	2,093
Average swap price (in dollars per barrel)	73.35
Fair value asset (liability) | $	$ 57,933
2016 Two Way Collars [Member]
Derivative [Line Items]
Total notional amount of oil (barrels) | MBbls	155
Average floor price (in dollars per barrel)	86.00
Average ceiling price (in dollars per barrel)	103.42
Fair value asset (liability) | $	$ 6,133
2016 Swaps [Member]
Derivative [Line Items]
Total notional amount of oil (barrels) | MBbls	5,643
Average swap price (in dollars per barrel)	57.75
Fair value asset (liability) | $	$ 51,499
2017 Swaps [Member]
Derivative [Line Items]
Total notional amount of oil (barrels) | MBbls	372
Average swap price (in dollars per barrel)	53.84
Fair value asset (liability) | $	$ 1,001

X

- Definition

Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher SEC



-Name Regulation S-X (SX)



-Number 210



-Article 12



-Section 13



-Sentence Column B

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- Definition

The average cap rate on a group of price risk derivatives such as caps or collars. A payment or receipt is triggered if the market rate exceeds the cap rate on the contract.

+ References

No definition available.

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- Definition

The average floor rate on a group of price risk derivatives such as floors or collars. A payment or receipt is triggered if the market rate falls below the floor rate on the contract.

+ References

No definition available.

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- Definition

Fair value of the assets less the liabilities of a derivative or group of derivatives.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 815



-SubTopic 10



-Section 45



-Paragraph 6



-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958



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-Name Accounting Standards Codification



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-Section 45



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-Publisher FASB



-Name Accounting Standards Codification



-Topic 825



-SubTopic 10



-Section 50



-Paragraph 10



-Subparagraph (a)



-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611



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-Publisher FASB



-Name Accounting Standards Codification



-Topic 825



-SubTopic 10



-Section 50



-Paragraph 15



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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

Average fixed price related to the group of price risk swap derivatives.

+ References

No definition available.

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