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Income Tax (Deferred Tax Assets/Liabilities) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
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Components of Deferred Tax Assets and Liabilities [Abstract] |  |  |
Excess tax basis over book basis of property, plant, and equipment | $ 7,893 us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment | $ 7,496 us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment | $ 8,001 us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment
Deferred Tax Assets, Marketable securities | 798 us-gaap_DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross | 661 us-gaap_DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross | 62 us-gaap_DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross
Operating loss carryforwards | 35,001 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | 36,367 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | 37,635 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Capital loss carryforwards | 10,212 us-gaap_DeferredTaxAssetsCapitalLossCarryforwards | 5,474 us-gaap_DeferredTaxAssetsCapitalLossCarryforwards | 2,630 us-gaap_DeferredTaxAssetsCapitalLossCarryforwards
Other | 2,891 us-gaap_DeferredTaxAssetsOther | 1,541 us-gaap_DeferredTaxAssetsOther | 3,219 us-gaap_DeferredTaxAssetsOther
Unrealized foreign exchange on loans |  | 79 vgz_UnrealizedForeignExchangeOnLoans | 217 vgz_UnrealizedForeignExchangeOnLoans
Deferred Tax Assets, Gross, Total | 56,795 us-gaap_DeferredTaxAssetsGross | 51,618 us-gaap_DeferredTaxAssetsGross | 51,764 us-gaap_DeferredTaxAssetsGross
Valuation allowance for future tax assets | (54,397)us-gaap_DeferredTaxAssetsValuationAllowance | (43,955)us-gaap_DeferredTaxAssetsValuationAllowance | (41,817)us-gaap_DeferredTaxAssetsValuationAllowance
Deferred Tax Assets, Net | 2,398 us-gaap_DeferredTaxAssetsNet | 7,663 us-gaap_DeferredTaxAssetsNet | 9,947 us-gaap_DeferredTaxAssetsNet
Other investments | 1,916 us-gaap_DeferredTaxLiabilitiesInvestments | 7,181 us-gaap_DeferredTaxLiabilitiesInvestments | 24,839 us-gaap_DeferredTaxLiabilitiesInvestments
Amayapampa disposal consideration | 482 vgz_AmayapampaDisposalConsideration | 482 vgz_AmayapampaDisposalConsideration | 482 vgz_AmayapampaDisposalConsideration
Deferred Income Tax Liabilities, Gross | 2,398 us-gaap_DeferredIncomeTaxLiabilities | 7,663 us-gaap_DeferredIncomeTaxLiabilities | 25,321 us-gaap_DeferredIncomeTaxLiabilities
Total Deferred Taxes |  |  | $ (15,374)us-gaap_DeferredTaxLiabilities

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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