Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Estimated Obligations and Companies Share for the Annual Charter Payment (Detail)

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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
Estimated obligation and company share for annual charter payment  
Annual charter payment, 2015 $ 25,843us-gaap_ContractualObligationDueInNextTwelveMonths
Annual charter payment, 2016 25,843us-gaap_ContractualObligationDueInSecondYear
Annual charter payment, 2017 25,843us-gaap_ContractualObligationDueInThirdYear
Annual charter payment, 2018 25,843us-gaap_ContractualObligationDueInFourthYear
Annual charter payment, 2019 25,843us-gaap_ContractualObligationDueInFifthYear
Annual charter payment, Thereafter 25,914us-gaap_ContractualObligationDueAfterFifthYear
Annual charter payment, Total 155,129us-gaap_ContractualObligation
Company Share  
Estimated obligation and company share for annual charter payment  
Annual charter payment, 2015 7,255us-gaap_ContractualObligationDueInNextTwelveMonths
/ dei_LegalEntityAxis
= egy_CompanyShareMember
Annual charter payment, 2016 7,255us-gaap_ContractualObligationDueInSecondYear
/ dei_LegalEntityAxis
= egy_CompanyShareMember
Annual charter payment, 2017 7,255us-gaap_ContractualObligationDueInThirdYear
/ dei_LegalEntityAxis
= egy_CompanyShareMember
Annual charter payment, 2018 7,255us-gaap_ContractualObligationDueInFourthYear
/ dei_LegalEntityAxis
= egy_CompanyShareMember
Annual charter payment, 2019 7,255us-gaap_ContractualObligationDueInFifthYear
/ dei_LegalEntityAxis
= egy_CompanyShareMember
Annual charter payment, Thereafter 7,275us-gaap_ContractualObligationDueAfterFifthYear
/ dei_LegalEntityAxis
= egy_CompanyShareMember
Annual charter payment, Total $ 43,550us-gaap_ContractualObligation
/ dei_LegalEntityAxis
= egy_CompanyShareMember