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Derivatives - Additional Information (Detail)
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Dec. 31, 2012
bbl
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|---|---|
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Crude Oil February 2013 December 2013 [Member] | Collar [Member]
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| Derivative [Line Items] | |
| Volume transacted in commodity derivatives position | 1,200 |
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Midland Cushing March 2013 December 2013 [Member] | Swap [Member]
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|
| Derivative [Line Items] | |
| Volume transacted in commodity derivatives position | 2,300 |
| Contract price in commodity derivatives position | 1.10 |
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Minimum [Member] | Crude Oil February 2013 December 2013 [Member] | Collar [Member]
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|
| Derivative [Line Items] | |
| Contract price in commodity derivatives position | 90.35 |
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Maximum [Member] | Crude Oil February 2013 December 2013 [Member] | Collar [Member]
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|
| Derivative [Line Items] | |
| Contract price in commodity derivatives position | 100.35 |