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Supplemental Information on Oil and Gas Producing Activities - Costs Incurred in Oil and Gas Property - Acquisition, Exploration and Development Activities (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Costs Incurred in Oil and Gas Property Acquisition, Exploration and Development Activities |  |  |
Exploration - expensed | $ 15,358 us-gaap_ExplorationExpense | $ 23,928 us-gaap_ExplorationExpense | $ 41,037 us-gaap_ExplorationExpense
Development | 52,800 us-gaap_CostsIncurredDevelopmentCosts |  |
United States |  |  |
Costs Incurred in Oil and Gas Property Acquisition, Exploration and Development Activities |  |  |
Exploration - capitalized |  |  | 2,602 us-gaap_CostsIncurredExplorationCosts / us-gaap_StatementGeographicalAxis = country_US
Exploration - expensed |  | 11,497 us-gaap_ExplorationExpense / us-gaap_StatementGeographicalAxis = country_US | 38,159 us-gaap_ExplorationExpense / us-gaap_StatementGeographicalAxis = country_US
Acquisition |  |  | 1,630 us-gaap_AcquisitionCosts / us-gaap_StatementGeographicalAxis = country_US
Development | 8 us-gaap_CostsIncurredDevelopmentCosts / us-gaap_StatementGeographicalAxis = country_US | 113 us-gaap_CostsIncurredDevelopmentCosts / us-gaap_StatementGeographicalAxis = country_US | 9,689 us-gaap_CostsIncurredDevelopmentCosts / us-gaap_StatementGeographicalAxis = country_US
Total | 8 us-gaap_CostsIncurredAcquisitionOfOilAndGasProperties / us-gaap_StatementGeographicalAxis = country_US | 11,610 us-gaap_CostsIncurredAcquisitionOfOilAndGasProperties / us-gaap_StatementGeographicalAxis = country_US | 52,080 us-gaap_CostsIncurredAcquisitionOfOilAndGasProperties / us-gaap_StatementGeographicalAxis = country_US
Foreign Tax Authority |  |  |
Costs Incurred in Oil and Gas Property Acquisition, Exploration and Development Activities |  |  |
Exploration - capitalized |  | 2,942 us-gaap_CostsIncurredExplorationCosts / us-gaap_StatementGeographicalAxis = egy_InternationalMember | 5,916 us-gaap_CostsIncurredExplorationCosts / us-gaap_StatementGeographicalAxis = egy_InternationalMember
Exploration - expensed | 15,358 us-gaap_ExplorationExpense / us-gaap_StatementGeographicalAxis = egy_InternationalMember | 12,431 us-gaap_ExplorationExpense / us-gaap_StatementGeographicalAxis = egy_InternationalMember | 2,878 us-gaap_ExplorationExpense / us-gaap_StatementGeographicalAxis = egy_InternationalMember
Acquisition |  |  | 10,000 us-gaap_AcquisitionCosts / us-gaap_StatementGeographicalAxis = egy_InternationalMember
Development | 79,722 us-gaap_CostsIncurredDevelopmentCosts / us-gaap_StatementGeographicalAxis = egy_InternationalMember | 54,420 us-gaap_CostsIncurredDevelopmentCosts / us-gaap_StatementGeographicalAxis = egy_InternationalMember | 4,022 us-gaap_CostsIncurredDevelopmentCosts / us-gaap_StatementGeographicalAxis = egy_InternationalMember
Total | $ 95,080 us-gaap_CostsIncurredAcquisitionOfOilAndGasProperties / us-gaap_StatementGeographicalAxis = egy_InternationalMember | $ 69,793 us-gaap_CostsIncurredAcquisitionOfOilAndGasProperties / us-gaap_StatementGeographicalAxis = egy_InternationalMember | $ 22,816 us-gaap_CostsIncurredAcquisitionOfOilAndGasProperties / us-gaap_StatementGeographicalAxis = egy_InternationalMember

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- Definition The capitalized costs incurred during the period (excluded from amortization) to purchase, lease or otherwise acquire an unproved property, including costs of lease bonuses and options to purchase or lease properties, the portion of costs applicable to minerals when land including mineral rights is purchased in fee, brokers' fees, recording fees, legal costs, and other costs incurred in acquiring properties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10.(c)(7)(ii)) -URI http://asc.fasb.org/extlink&oid=27015464&loc=d3e511914-122862 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 10 -Paragraph c -Subparagraph 3(ii)(A) -Article 4 + Details
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- Definition Cost incurred, including capitalized costs and costs charged to expense, in acquisition of oil and gas properties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 18 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62014-109447 + Details
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- Definition Development costs incurred, including capitalized costs and costs charged to expense, in oil and gas activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 18 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62014-109447 + Details
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- Definition Exploration costs incurred, including capitalized costs and costs charged to expense, in oil and gas activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Exploration -URI http://asc.fasb.org/extlink&oid=6512329 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 18 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62014-109447 + Details
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- Definition Exploration expenses (including prospecting) related to oil and gas producing entities and would be included in operating expenses of that entity. Costs incurred in identifying areas that may warrant examination and in examining specific areas that are considered to have prospects of containing oil and gas reserves, including costs of drilling exploratory wells and exploratory-type stratigraphic test wells. Exploration costs may be incurred both before acquiring the related property (sometimes referred to in part as prospecting costs) and after acquiring the property. Principal types of exploration costs, which include depreciation and applicable operating costs of support equipment and facilities and other costs of exploration activities, are: (i) Costs of topographical, geographical and geophysical studies, rights of access to properties to conduct those studies, and salaries and other expenses of geologists, geophysical crews, and others conducting those studies. Collectively, these are sometimes referred to as geological and geophysical or "G&G" costs. (ii) Costs of carrying and retaining undeveloped properties, such as delay rentals, ad valorem taxes on properties, legal costs for title defense, and the maintenance of land and lease records. (iii) Dry hole contributions and bottom hole contributions. (iv) Costs of drilling and equipping exploratory wells. (v) Costs of drilling exploratory-type stratigraphic test wells. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Section 25 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6474861&loc=d3e64954-109465 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10.(a)(15)) -URI http://asc.fasb.org/extlink&oid=27015464&loc=d3e511914-122862 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 10 -Paragraph a -Subparagraph 15 -Article 4 + Details
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