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Income Tax (Operating Loss Carryforward Expirations) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014
Operating Loss Carryforwards | 59,062 us-gaap_OperatingLossCarryforwards |
U.S. |  |
Operating Loss Carryforwards | 17,210 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember |
Noncapital Canada [Member] |  |
Operating Loss Carryforwards | 41,164 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = vgz_NoncapitalCanadaMember | [1]
Mexico [Member] |  |
Operating Loss Carryforwards | 543 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = vgz_MexicoMember |
Barbados [Member] |  |
Operating Loss Carryforwards | 146 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = vgz_BarbadosMember |
Tax Year 2014 [Member] |  |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2014 |
Tax Year 2015 [Member] |  |
Operating Loss Carryforwards | 891 us-gaap_OperatingLossCarryforwards / vgz_TaxPeriodAxis = vgz_TaxYear2015Member |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2015 |
Tax Year 2015 [Member] | Noncapital Canada [Member] |  |
Operating Loss Carryforwards | 889 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = vgz_NoncapitalCanadaMember / vgz_TaxPeriodAxis = vgz_TaxYear2015Member | [1]
Tax Year 2015 [Member] | Barbados [Member] |  |
Operating Loss Carryforwards | 2 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = vgz_BarbadosMember / vgz_TaxPeriodAxis = vgz_TaxYear2015Member |
Tax Year 2016 [Member] |  |
Operating Loss Carryforwards | 1 us-gaap_OperatingLossCarryforwards / vgz_TaxPeriodAxis = vgz_TaxYear2016Member |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2016 |
Tax Year 2016 [Member] | Barbados [Member] |  |
Operating Loss Carryforwards | 1 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = vgz_BarbadosMember / vgz_TaxPeriodAxis = vgz_TaxYear2016Member |
Tax Year 2017 [Member] |  |
Operating Loss Carryforwards | 6 us-gaap_OperatingLossCarryforwards / vgz_TaxPeriodAxis = vgz_TaxYear2017Member |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2017 |
Tax Year 2017 [Member] | Barbados [Member] |  |
Operating Loss Carryforwards | 6 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = vgz_BarbadosMember / vgz_TaxPeriodAxis = vgz_TaxYear2017Member |
Tax Year 2018 [Member] |  |
Operating Loss Carryforwards | 20 us-gaap_OperatingLossCarryforwards / vgz_TaxPeriodAxis = vgz_TaxYear2018Member |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2018 |
Tax Year 2018 [Member] | Barbados [Member] |  |
Operating Loss Carryforwards | 20 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = vgz_BarbadosMember / vgz_TaxPeriodAxis = vgz_TaxYear2018Member |
Tax Year 2019 [Member] |  |
Operating Loss Carryforwards | 42 us-gaap_OperatingLossCarryforwards / vgz_TaxPeriodAxis = vgz_TaxYear2019Member |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2019 |
Tax Year 2019 [Member] | Barbados [Member] |  |
Operating Loss Carryforwards | 42 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = vgz_BarbadosMember / vgz_TaxPeriodAxis = vgz_TaxYear2019Member |
Tax Year 2020 [Member] |  |
Operating Loss Carryforwards | 20 us-gaap_OperatingLossCarryforwards / vgz_TaxPeriodAxis = vgz_TaxYear2020Member |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2020 |
Tax Year 2020 [Member] | Barbados [Member] |  |
Operating Loss Carryforwards | 20 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = vgz_BarbadosMember / vgz_TaxPeriodAxis = vgz_TaxYear2020Member |
Tax Year 2021 [Member] |  |
Operating Loss Carryforwards | 31 us-gaap_OperatingLossCarryforwards / vgz_TaxPeriodAxis = vgz_TaxYear2021Member |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2021 |
Tax Year 2021 [Member] | Barbados [Member] |  |
Operating Loss Carryforwards | 31 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = vgz_BarbadosMember / vgz_TaxPeriodAxis = vgz_TaxYear2021Member |
Tax Year 2022 [Member] |  |
Operating Loss Carryforwards | 29 us-gaap_OperatingLossCarryforwards / vgz_TaxPeriodAxis = vgz_TaxYear2022Member |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2022 |
Tax Year 2022 [Member] | Mexico [Member] |  |
Operating Loss Carryforwards | 6 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = vgz_MexicoMember / vgz_TaxPeriodAxis = vgz_TaxYear2022Member |
Tax Year 2022 [Member] | Barbados [Member] |  |
Operating Loss Carryforwards | 23 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = vgz_BarbadosMember / vgz_TaxPeriodAxis = vgz_TaxYear2022Member |
Tax Year 2023 [Member] |  |
Operating Loss Carryforwards | 397 us-gaap_OperatingLossCarryforwards / vgz_TaxPeriodAxis = vgz_TaxYear2023Member |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2023 |
Tax Year 2023 [Member] | Mexico [Member] |  |
Operating Loss Carryforwards | 397 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = vgz_MexicoMember / vgz_TaxPeriodAxis = vgz_TaxYear2023Member |
Tax Year 2024 [Member] |  |
Operating Loss Carryforwards | 140 us-gaap_OperatingLossCarryforwards / vgz_TaxPeriodAxis = vgz_TaxYear2024Member |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2024 |
Tax Year 2024 [Member] | Mexico [Member] |  |
Operating Loss Carryforwards | 140 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = vgz_MexicoMember / vgz_TaxPeriodAxis = vgz_TaxYear2024Member |
Tax Year 2025 [Member] |  |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2025 |
Tax Year 2026 [Member] |  |
Operating Loss Carryforwards | 2,193 us-gaap_OperatingLossCarryforwards / vgz_TaxPeriodAxis = vgz_TaxYear2026Member |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2026 |
Tax Year 2026 [Member] | U.S. |  |
Operating Loss Carryforwards | 1,166 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember / vgz_TaxPeriodAxis = vgz_TaxYear2026Member |
Tax Year 2026 [Member] | Noncapital Canada [Member] |  |
Operating Loss Carryforwards | 1,027 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = vgz_NoncapitalCanadaMember / vgz_TaxPeriodAxis = vgz_TaxYear2026Member | [1]
Tax Year 2027 [Member] |  |
Operating Loss Carryforwards | 2,547 us-gaap_OperatingLossCarryforwards / vgz_TaxPeriodAxis = vgz_TaxYear2027Member |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2027 |
Tax Year 2027 [Member] | U.S. |  |
Operating Loss Carryforwards | 1,700 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember / vgz_TaxPeriodAxis = vgz_TaxYear2027Member |
Tax Year 2027 [Member] | Noncapital Canada [Member] |  |
Operating Loss Carryforwards | 847 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = vgz_NoncapitalCanadaMember / vgz_TaxPeriodAxis = vgz_TaxYear2027Member | [1]
Tax Year 2028 [Member] |  |
Operating Loss Carryforwards | 6,964 us-gaap_OperatingLossCarryforwards / vgz_TaxPeriodAxis = vgz_TaxYear2028Member |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2028 |
Tax Year 2028 [Member] | U.S. |  |
Operating Loss Carryforwards | 1,719 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember / vgz_TaxPeriodAxis = vgz_TaxYear2028Member |
Tax Year 2028 [Member] | Noncapital Canada [Member] |  |
Operating Loss Carryforwards | 5,245 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = vgz_NoncapitalCanadaMember / vgz_TaxPeriodAxis = vgz_TaxYear2028Member | [1]
Tax Year 2029 [Member] |  |
Operating Loss Carryforwards | 5,992 us-gaap_OperatingLossCarryforwards / vgz_TaxPeriodAxis = vgz_TaxYear2029Member |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2029 |
Tax Year 2029 [Member] | U.S. |  |
Operating Loss Carryforwards | 1,970 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember / vgz_TaxPeriodAxis = vgz_TaxYear2029Member |
Tax Year 2029 [Member] | Noncapital Canada [Member] |  |
Operating Loss Carryforwards | 4,022 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = vgz_NoncapitalCanadaMember / vgz_TaxPeriodAxis = vgz_TaxYear2029Member | [1]
Tax Year 2030 [Member] |  |
Operating Loss Carryforwards | 6,859 us-gaap_OperatingLossCarryforwards / vgz_TaxPeriodAxis = vgz_TaxYear2030Member |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2030 |
Tax Year 2030 [Member] | U.S. |  |
Operating Loss Carryforwards | 1,827 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember / vgz_TaxPeriodAxis = vgz_TaxYear2030Member |
Tax Year 2030 [Member] | Noncapital Canada [Member] |  |
Operating Loss Carryforwards | 5,032 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = vgz_NoncapitalCanadaMember / vgz_TaxPeriodAxis = vgz_TaxYear2030Member | [1]
Tax Year 2031 [Member] |  |
Operating Loss Carryforwards | 7,213 us-gaap_OperatingLossCarryforwards / vgz_TaxPeriodAxis = vgz_TaxYear2031Member |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2031 |
Tax Year 2031 [Member] | U.S. |  |
Operating Loss Carryforwards | 3,407 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember / vgz_TaxPeriodAxis = vgz_TaxYear2031Member |
Tax Year 2031 [Member] | Noncapital Canada [Member] |  |
Operating Loss Carryforwards | 3,806 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = vgz_NoncapitalCanadaMember / vgz_TaxPeriodAxis = vgz_TaxYear2031Member | [1]
Tax Year 2032 [Member] |  |
Operating Loss Carryforwards | 8,720 us-gaap_OperatingLossCarryforwards / vgz_TaxPeriodAxis = vgz_TaxYear2032Member |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2032 |
Tax Year 2032 [Member] | U.S. |  |
Operating Loss Carryforwards | 2,323 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember / vgz_TaxPeriodAxis = vgz_TaxYear2032Member |
Tax Year 2032 [Member] | Noncapital Canada [Member] |  |
Operating Loss Carryforwards | 6,397 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = vgz_NoncapitalCanadaMember / vgz_TaxPeriodAxis = vgz_TaxYear2032Member | [1]
Tax Year 2033 [Member] |  |
Operating Loss Carryforwards | 12,674 us-gaap_OperatingLossCarryforwards / vgz_TaxPeriodAxis = vgz_TaxYear2033Member |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2033 |
Tax Year 2033 [Member] | U.S. |  |
Operating Loss Carryforwards | 3,098 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember / vgz_TaxPeriodAxis = vgz_TaxYear2033Member |
Tax Year 2033 [Member] | Noncapital Canada [Member] |  |
Operating Loss Carryforwards | 9,576 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = vgz_NoncapitalCanadaMember / vgz_TaxPeriodAxis = vgz_TaxYear2033Member | [1]
Tax Year 2034 [Member] |  |
Operating Loss Carryforwards | 4,323 us-gaap_OperatingLossCarryforwards / vgz_TaxPeriodAxis = vgz_TaxYear2034Member |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2034 |
Tax Year 2034 [Member] | Noncapital Canada [Member] |  |
Operating Loss Carryforwards | 4,323 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = vgz_NoncapitalCanadaMember / vgz_TaxPeriodAxis = vgz_TaxYear2034Member | [1]
[1] | Canadian capital loss carryforwards of $36,524 and Australian NOLs of $67,064, which do not expire and are therefore not included above.

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