Derivative Activities - Derivative Volumes Hedged and Average Hedge Prices (Detail)	Dec. 31, 2014
Natural Gas \| Collars \| 2015
Derivative [Line Items]
Volume Hedged	145,000
Average floor price	4.07
Average cap price	4.56
Natural Gas \| Swaps \| 2015
Derivative [Line Items]
Volume Hedged	412,390
Average hedge price	4.15
Natural Gas \| Swaps \| 2016
Derivative [Line Items]
Volume Hedged	120,000
Average hedge price	4.15
Crude Oil \| Swaps \| 2015
Derivative [Line Items]
Volume Hedged	9,626
Average hedge price	90.57
Crude Oil \| Swaps \| 2016
Derivative [Line Items]
Volume Hedged	1,000
Average hedge price	91.43
Commodity Contract NGLs (C3 - Propane) \| Swaps \| 2015
Derivative [Line Items]
Volume Hedged	2,245
Average hedge price	0.95
Commodity Contract NGLs (C5 - Natural Gasoline) \| Swaps \| 2015 - first quarter
Derivative [Line Items]
Volume Hedged	500
Average hedge price	2.14

- 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

+ Details

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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.

+ Details

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Period Type:	instant

- 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.

+ Details

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- Details

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- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	us-types:perUnitItemType
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- Details

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Namespace Prefix:
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- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
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- Details

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