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Income Tax (Sources of Income) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest, Total | $ (18,926)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ (74,861)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ (90,803)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
U.S. |  |  |
Federal Income Tax Expense (Benefit), Continuing Operations | (6,705)us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember | (49,124)us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember | (52,448)us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember
Foreign Tax Authority [Member] |  |  |
Foreign Income Tax Expense (Benefit), Continuing Operations | (4,471)us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember | (16,197)us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember | (26,393)us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember
Canada [Member] |  |  |
Foreign Income Tax Expense (Benefit), Continuing Operations | $ (7,750)us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations / us-gaap_IncomeTaxAuthorityAxis = vgz_CanadaMember | $ (9,540)us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations / us-gaap_IncomeTaxAuthorityAxis = vgz_CanadaMember | $ (11,962)us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations / us-gaap_IncomeTaxAuthorityAxis = vgz_CanadaMember

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- Definition Amount of current and deferred income tax expense (benefit) attributable to income (loss) from continuing domestic operations within the country of domicile of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32672-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 1 -Article 4 + Details
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- Definition Amount of current and deferred income tax expense (benefit) attributable to income (loss) from continuing foreign operations not within the country of domicile of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 1 -Article 4 + Details
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- Definition This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses and taxes from ongoing operations before extraordinary items, and noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569616-111683 + Details
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