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Supplemental Oil Reserve Information (Unaudited) - Additional Information (Detail) | Dec. 31, 2012 bbl | Dec. 31, 2011 bbl | Dec. 31, 2010 bbl
--- | --- | --- | ---
Reserve Quantities [Line Items] |  |  |
Proved developed reserves | 2,927,000 | 2,714,150 | 2,320,150
Proved Developed Reserves |  |  |
Reserve Quantities [Line Items] |  |  |
Proved developed reserves | 1,546.3 | 643.1 |
Proved Undeveloped Reserve [Member] |  |  |
Reserve Quantities [Line Items] |  |  |
Proved developed reserves | 1,380.8 | 2,071.1 |

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- Definition The net quantity of proved reserves as of the balance sheet date. Proved oil reserves are the estimated quantities of crude oil and natural gas liquids which geological and engineering data demonstrate with reasonable certainty to be recoverable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 10 -Paragraph a -Subparagraph 2 -Article 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61831-109447 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10.(a)(2)) -URI http://asc.fasb.org/extlink&oid=21918352&loc=d3e511914-122862 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 19 -Paragraph 59F -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Details
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