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Disclosures About Oil and Gas Producing Activities - Commodity Prices Inclusive of Adjustments for Quality and Location Used in Determining Future Net Revenues Related to Standardized Measure Calculation (Detail)
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12 Months Ended | ||
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Oil (MBbls) [Member]
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| Average Sales Price and Production Costs Per Unit of Production [Line Items] | |||
| Commodity Prices | 90.21 | 89.65 | 74.90 |
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NGLs (MBbls) [Member]
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| Average Sales Price and Production Costs Per Unit of Production [Line Items] | |||
| Commodity Prices | 37.88 | 49.63 | 39.25 |
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Natural Gas (MMcf) [Member]
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| Average Sales Price and Production Costs Per Unit of Production [Line Items] | |||
| Commodity Prices | 2.62 | 3.97 | 4.13 |