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Income Taxes - Income Tax Years Subject to Examination by Major Tax Jurisdictions (Detail) | 12 Months Ended
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Dec. 31, 2014
United States | Minimum |
Income Tax years subject to examination by major tax jurisdictions |
Income tax examination year under examination | 2008
United States | Maximum |
Income Tax years subject to examination by major tax jurisdictions |
Income tax examination year under examination | 2014
Gabon | Minimum |
Income Tax years subject to examination by major tax jurisdictions |
Income tax examination year under examination | 2007
Gabon | Maximum |
Income Tax years subject to examination by major tax jurisdictions |
Income tax examination year under examination | 2014

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- Details
Name: | egy_IncomeTaxExaminationOpenTaxYearAbstract
Namespace Prefix: | egy_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Tax year being audited in the income tax examination, in CCYY format. + References No definition available. + Details
Name: | us-gaap_IncomeTaxExaminationYearUnderExamination
Namespace Prefix: | us-gaap_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_IncomeTaxAuthorityAxis=country_GA
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeTaxAuthorityAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |