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Income Taxes - Additional Information (Detail) (USD $) | 12 Months Ended |
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Dec. 31, 2013 | Dec. 31, 2014
Income Taxes (Textual) [Abstract] |  |
Valuation allowance | $ 137,348,000 us-gaap_DeferredTaxAssetsValuationAllowance | $ 166,111,000 us-gaap_DeferredTaxAssetsValuationAllowance
Increase in deferred tax assets, tax credit carryforwards, foreign | $ 28,000,000 egy_IncreaseInDeferredTaxAssetsTaxCreditCarryforwardsForeign |

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- Definition Increase in deferred tax assets tax credit carryforwards foreign. + References No definition available. + Details
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Namespace Prefix: | egy_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
Name: | us-gaap_DeferredTaxAssetsValuationAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant