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Derivatives - Additional information (Detail) (Collar [Member])
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Mar. 31, 2013
MMBTU
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|---|---|
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Natural Gas May 2013 December 2013 [Member]
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| Derivative [Line Items] | |
| Volume transacted in commodity derivatives position | 100,000 |
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Oil 2014 [Member]
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| Derivative [Line Items] | |
| Volume transacted in commodity derivatives position | 950 |
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Minimum [Member] | Natural Gas May 2013 December 2013 [Member]
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| Derivative [Line Items] | |
| Contract price in commodity derivatives position | 4.00 |
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Minimum [Member] | Oil 2014 [Member]
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| Derivative [Line Items] | |
| Contract price in commodity derivatives position | 85.05 |
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Maximum [Member] | Natural Gas May 2013 December 2013 [Member]
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|
| Derivative [Line Items] | |
| Contract price in commodity derivatives position | 4.36 |
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Maximum [Member] | Oil 2014 [Member]
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| Derivative [Line Items] | |
| Contract price in commodity derivatives position | 95.05 |