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Significant Accounting Policies - Additional Information (Detail) (USD $)
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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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| Significant Accounting Policies [Line Items] | |||
| Reclassification of insurance receivables | $ 700,000 | ||
| Natural gas imbalances | 6,000,000 | 6,500,000 | |
| Percentage of discount from proved reserves | 10.00% | ||
| Ceiling test impairment | $ 0 | $ 0 | $ 0 |
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Furniture, Fixtures and Non-Oil and Natural Gas Property and Equipment | Minimum
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| Significant Accounting Policies [Line Items] | |||
| Estimated useful lives | 5 years | ||
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Furniture, Fixtures and Non-Oil and Natural Gas Property and Equipment | Maximum
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| Significant Accounting Policies [Line Items] | |||
| Estimated useful lives | 7 years | ||
| X | ||||||||||
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- Definition
The value of gas balancing asset or liability as of the end of the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The amount of a reclassification adjustment made to prior period financial statement amounts. No definition available.
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| X | ||||||||||
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- Definition
Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. No definition available.
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| X | ||||||||||
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- Definition
ceiling test impairment No definition available.
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| X | ||||||||||
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- Definition
Percentage Of Discount From Proved Reserves No definition available.
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| X | ||||||||||
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- Details
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