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Capitalization of Exploratory Well Costs - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013
Accounting Standards Update 2010-03 |
Capitalized Costs Relating To Oil And Gas Producing Activities By Geographic Area [Line Items] |
Accounting Standard Code for Extractive Industries followed for capitalization purposes - ASC Topic 932 | ASC Topic 932 - Extractive Industries provides that an exploratory well shall be capitalized as part of the entity’s uncompleted wells pending the determination of whether the well has found proved reserves. Further, an exploration well that discovers oil and gas reserves, but those reserves cannot be classified as proved when drilling is completed, shall be capitalized if the well has found a sufficient quantity of reserves to justify its completion as a producing well and the entity is making sufficient progress assessing the reserves and the economic and operating viability of the project. If either condition is not met, the exploration well would be assumed to be impaired and its costs would be charged to expense.
Etame Marin |
Capitalized Costs Relating To Oil And Gas Producing Activities By Geographic Area [Line Items] |
Number of side tracks | 2
Area of sand of oil | 5
North Tchibala |
Capitalized Costs Relating To Oil And Gas Producing Activities By Geographic Area [Line Items] |
Capitalization on development plan | $ 7.8
Mutamba Iroru |
Capitalized Costs Relating To Oil And Gas Producing Activities By Geographic Area [Line Items] |
Number of side tracks | 3
Capitalization on development plan | $ 8.9

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- Definition Additions to capitalized exploratory well costs that were added during the reporting period pending the determination of proved reserves. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 1B -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=8451039&loc=SL6806780-109447 + Details
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- Definition Interim financial statement disclosure that includes information about any significant change in the information disclosed in the most recent annual financial statements related to capitalized exploratory well costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=8451039&loc=SL6806780-109447 + Details
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