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Asset Retirement Obligations - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
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Dec. 31, 2014 Platforms Well | Dec. 31, 2012 | Dec. 31, 2013 Well
Disclosure - Asset Retirement Obligations - Additional Information (Detail) [Line Items] |  |  |
Number of wells |  |  | 2 egy_NumberOfWells
Revisions | $ 136 us-gaap_AssetRetirementObligationRevisionOfEstimate | $ (5,744)us-gaap_AssetRetirementObligationRevisionOfEstimate |
Number of new platforms | 2 egy_NumberOfPlatforms |  |
Abandoned period of material assets | P5Y |  |
Offshore Gabon |  |  |
Disclosure - Asset Retirement Obligations - Additional Information (Detail) [Line Items] |  |  |
Number of wells | 2 egy_NumberOfWells / us-gaap_StatementGeographicalAxis = egy_OffshoreGabonMember |  |

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- Definition Number of platforms. + References No definition available. + Details
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- Definition Number of wells. + References No definition available. + Details
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- Definition Amount of the Increase or Decrease in the amount of the asset retirement obligation during the current period for changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition The timing in which the entity expects to abandon the long-lived asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 35 -Paragraph 47 -URI http://asc.fasb.org/extlink&oid=29634951&loc=d3e1794-110224 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 35 -Paragraph 48 -URI http://asc.fasb.org/extlink&oid=29634951&loc=d3e1816-110224 + Details
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