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

X

- Definition

Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319

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X

- Definition

Expiration date of each operating loss carryforward included in operating loss carryforward, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319

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