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Summary of Subsequent Additional Commodity Derivative Contracts (Detail) (Subsequent additional commodity derivative contracts)
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Dec. 31, 2013
bbl
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2015 Swap Oil | Oil (NYMEX WTI) | January 1, 2015 - June 30, 2015
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| Derivative [Line Items] | |
| Bbl per Day | 1,000 |
| Weighted Average Swap Price Per Bbl | 90.31 |
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2015 Swap Oil | Oil (NYMEX WTI) | 2015
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| Derivative [Line Items] | |
| Bbl per Day | 3,000 |
| Weighted Average Swap Price Per Bbl | 89.05 |
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Two Way | 2015 Collar | Oil (NYMEX WTI) | 2015
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| Derivative [Line Items] | |
| Bbl per Day | 1,000 |
| Weighted Average Floor Price per Bbl | 84.17 |
| Weighted Average Ceiling Price Per Bbl | 92.10 |
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Three Way | 2015 Collar | Gas (NYMEX HH) | January 1, 2015 - March 31, 2015
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| Derivative [Line Items] | |
| Bbl per Day | 5,000 |
| Weighted Average Short Put Price Per MMBtu | 3.75 |
| Weighted Average Floor Price per Bbl | 4.50 |
| Weighted Average Ceiling Price Per Bbl | 5.55 |