Derivative Activities - Derivative Volumes Hedged and Average Hedge Prices (Detail)	Sep. 30, 2015 MMBTU / d bbl / d $ / MMBTU $ / bbl $ / gal
Natural Gas \| Collars \| 2015
Derivative [Line Items]
Volume Hedged \| MMBTU / d	145,000
Average floor price \| $ / MMBTU	4.07
Average cap price \| $ / MMBTU	4.56
Natural Gas \| Swaps \| 2015
Derivative [Line Items]
Volume Hedged \| MMBTU / d	727,500
Average hedge price \| $ / MMBTU	3.63
Natural Gas \| Swaps \| 2016
Derivative [Line Items]
Volume Hedged \| MMBTU / d	630,000
Average hedge price \| $ / MMBTU	3.42
Natural Gas \| Swaps \| 2017
Derivative [Line Items]
Volume Hedged \| MMBTU / d	20,000
Average hedge price \| $ / MMBTU	3.49
Crude Oil \| Swaps \| 2016
Derivative [Line Items]
Volume Hedged	3,999
Average hedge price \| $ / bbl	66.09
Crude Oil \| Swaps \| 2017
Derivative [Line Items]
Volume Hedged	500
Average hedge price \| $ / bbl	55.00
Crude Oil \| Sold Swaps \| 2015
Derivative [Line Items]
Volume Hedged	11,250
Average hedge price \| $ / bbl	85.87
Crude Oil \| Re-purchased Swaps \| 2015
Derivative [Line Items]
Volume Hedged	2,500
Average hedge price \| $ / bbl	40.19
Commodity Contract NGLs (C3 - Propane) \| Swaps \| 2015
Derivative [Line Items]
Volume Hedged	12,000
Average hedge price \| $ / gal	0.55
Commodity Contract NGLs (C3 - Propane) \| Swaps \| 2016
Derivative [Line Items]
Volume Hedged	5,500
Average hedge price \| $ / gal	0.60
Commodity Contract NGLs (NC4 - Normal Butane) \| Swaps \| 2015
Derivative [Line Items]
Volume Hedged	3,500
Average hedge price \| $ / gal	0.72
Commodity Contract NGLs (NC4 - Normal Butane) \| Swaps \| 2016
Derivative [Line Items]
Volume Hedged	2,500
Average hedge price \| $ / gal	0.72
Commodity Contract NGLs (C5 - Natural Gasoline) \| Swaps \| 2015
Derivative [Line Items]
Volume Hedged	4,000
Average hedge price \| $ / gal	1.16
Commodity Contract NGLs (C5 - Natural Gasoline) \| Swaps \| 2016
Derivative [Line Items]
Volume Hedged	2,500
Average hedge price \| $ / gal	1.23

- 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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- 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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- 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.

+ 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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- Details

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- Details

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