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Commitments and Contingencies - Estimated Obligations and Companies Share for the Annual Charter Payment (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014
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Estimated obligation and company share for annual charter payment |
Annual charter payment, 2015 | $ 25,843 us-gaap_ContractualObligationDueInNextTwelveMonths
Annual charter payment, 2016 | 25,843 us-gaap_ContractualObligationDueInSecondYear
Annual charter payment, 2017 | 25,843 us-gaap_ContractualObligationDueInThirdYear
Annual charter payment, 2018 | 25,843 us-gaap_ContractualObligationDueInFourthYear
Annual charter payment, 2019 | 25,843 us-gaap_ContractualObligationDueInFifthYear
Annual charter payment, Thereafter | 25,914 us-gaap_ContractualObligationDueAfterFifthYear
Annual charter payment, Total | 155,129 us-gaap_ContractualObligation
Company Share |
Estimated obligation and company share for annual charter payment |
Annual charter payment, 2015 | 7,255 us-gaap_ContractualObligationDueInNextTwelveMonths / dei_LegalEntityAxis = egy_CompanyShareMember
Annual charter payment, 2016 | 7,255 us-gaap_ContractualObligationDueInSecondYear / dei_LegalEntityAxis = egy_CompanyShareMember
Annual charter payment, 2017 | 7,255 us-gaap_ContractualObligationDueInThirdYear / dei_LegalEntityAxis = egy_CompanyShareMember
Annual charter payment, 2018 | 7,255 us-gaap_ContractualObligationDueInFourthYear / dei_LegalEntityAxis = egy_CompanyShareMember
Annual charter payment, 2019 | 7,255 us-gaap_ContractualObligationDueInFifthYear / dei_LegalEntityAxis = egy_CompanyShareMember
Annual charter payment, Thereafter | 7,275 us-gaap_ContractualObligationDueAfterFifthYear / dei_LegalEntityAxis = egy_CompanyShareMember
Annual charter payment, Total | $ 43,550 us-gaap_ContractualObligation / dei_LegalEntityAxis = egy_CompanyShareMember

X
- Definition Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments. + References No definition available. + Details
Name: | us-gaap_ContractualObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of contractual obligation maturing after the fifth fiscal year following the latest fiscal year. + References No definition available. + Details
Name: | us-gaap_ContractualObligationDueAfterFifthYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of contractual obligation maturing in the fifth fiscal year following the latest fiscal year. + References No definition available. + Details
Name: | us-gaap_ContractualObligationDueInFifthYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of contractual obligation maturing in the fourth fiscal year following the latest fiscal year. + References No definition available. + Details
Name: | us-gaap_ContractualObligationDueInFourthYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of contractual obligation maturing in the next fiscal year following the latest fiscal year. + References No definition available. + Details
Name: | us-gaap_ContractualObligationDueInNextTwelveMonths
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of contractual obligation maturing in the second fiscal year following the latest fiscal year. + References No definition available. + Details
Name: | us-gaap_ContractualObligationDueInSecondYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of contractual obligation maturing in the third fiscal year following the latest fiscal year. + References No definition available. + Details
Name: | us-gaap_ContractualObligationDueInThirdYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_ContractualObligationFiscalYearMaturityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=egy_CompanyShareMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |