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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, 2013
United States |
Income Tax years subject to examination by major tax jurisdictions |
Income tax examination year under examination range start |
Income tax examination year under examination range end |
Gabon |
Income Tax years subject to examination by major tax jurisdictions |
Income tax examination year under examination range start |
Income tax examination year under examination range end |

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

X
- Definition Income tax examination year under examination range end. + References No definition available. + Details
Name: | egy_IncomeTaxExaminationYearUnderExaminationRangeEnd
Namespace Prefix: | egy_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

X
- Definition Income tax examination year under examination range start. + References No definition available. + Details
Name: | egy_IncomeTaxExaminationYearUnderExaminationRangeStart
Namespace Prefix: | egy_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration