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Future Net Cash Flows Relating to Proved Oil and Gas Reserves (Parenthetical) (Detail)
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12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] | |||
| Discount factor | 10.00% | 10.00% | 10.00% |