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Derivatives - Commodity Derivatives Volumes and Prices (Detail)
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Dec. 31, 2012
MMBTU
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|---|---|
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Natural Gas - 2013 Contract One [Member] | Swap [Member]
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| Derivative [Line Items] | |
| Volume Transacted | 200,000 |
| Contract Price | 3.54 |
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Natural Gas - 2013 Contract Two [Member] | Swap [Member]
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|
| Derivative [Line Items] | |
| Volume Transacted | 190,000 |
| Contract Price | 3.80 |
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Crude Oil - 2013 Contract One [Member] | Collar [Member]
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|
| Derivative [Line Items] | |
| Volume Transacted | 650 |
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Crude Oil - 2013 Contract One [Member] | Minimum [Member] | Collar [Member]
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| Derivative [Line Items] | |
| Contract Price | 90.00 |
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Crude Oil - 2013 Contract One [Member] | Maximum [Member] | Collar [Member]
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|
| Derivative [Line Items] | |
| Contract Price | 105.80 |
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Crude Oil - 2013 Contract Two [Member] | Collar [Member]
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| Derivative [Line Items] | |
| Volume Transacted | 450 |
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Crude Oil - 2013 Contract Two [Member] | Minimum [Member] | Collar [Member]
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| Derivative [Line Items] | |
| Contract Price | 90.00 |
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Crude Oil - 2013 Contract Two [Member] | Maximum [Member] | Collar [Member]
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|
| Derivative [Line Items] | |
| Contract Price | 101.45 |
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Crude Oil - 2014 [Member] | Collar [Member]
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| Derivative [Line Items] | |
| Volume Transacted | 550 |
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Crude Oil - 2014 [Member] | Minimum [Member] | Collar [Member]
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|
| Derivative [Line Items] | |
| Contract Price | 90.00 |
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Crude Oil - 2014 [Member] | Maximum [Member] | Collar [Member]
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| Derivative [Line Items] | |
| Contract Price | 105.50 |