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Accumulated Other Comprehensive Income/(Loss) (Reconciliation Of Amounts Contained In Accumulated Other Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Accumulated other comprehensive income |  |  |  |
Beginning of period | $ (59)vgz_AccumulatedOtherComprehensiveIncomeLoss |  | $ 2 vgz_AccumulatedOtherComprehensiveIncomeLoss |
Decreases to fair market value during period | 21 us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeReclassificationAdjustmentsAndTax | [1] | 268 us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeReclassificationAdjustmentsAndTax |
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Net of Tax | (24)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax | [2] | (54)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax | [1]
Reclassifications Due To Write Down Of Marketable Securities | 73 vgz_ReclassificationsDueToWriteDownOfMarketableSecurities |  | (275)vgz_ReclassificationsDueToWriteDownOfMarketableSecurities |
End of period | 11 vgz_AccumulatedOtherComprehensiveIncomeLoss |  | (59)vgz_AccumulatedOtherComprehensiveIncomeLoss |
Accumulated other comprehensive income, net of tax |  |  |  |
Beginning of period | (50)vgz_AccumulatedOtherComprehensiveIncomeNetOfTax |  | 2 vgz_AccumulatedOtherComprehensiveIncomeNetOfTax |
Decreases to fair market value during period | 18 us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeReclassificationAdjustmentsNetOfTax | [1] | 228 us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeReclassificationAdjustmentsNetOfTax |
Decreases due to realization of a gain | (24)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax | [2] | (54)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax | [1]
Accumulated other comprehensive income, net of tax due to change in fair market value | (20)vgz_AccumulatedOtherComprehensiveIncomeNetOfTaxDueToChangeInFairMarketValue | [2] | (46)vgz_AccumulatedOtherComprehensiveIncomeNetOfTaxDueToChangeInFairMarketValue | [1]
Reclassifications Due To Write Down Of Marketable Securities Accumulated Other Comprehensive Income Net Of Tax | 62 vgz_ReclassificationsDueToWriteDownOfMarketableSecuritiesAccumulatedOtherComprehensiveIncomeNetOfTax |  | (234)vgz_ReclassificationsDueToWriteDownOfMarketableSecuritiesAccumulatedOtherComprehensiveIncomeNetOfTax |
End of period | $ 10 vgz_AccumulatedOtherComprehensiveIncomeNetOfTax |  | $ (50)vgz_AccumulatedOtherComprehensiveIncomeNetOfTax |
[1] | Reclassified to gain/(loss) on sale of marketable securities on the Consolidated Statement of Income/(Loss) and Comprehensive Income/(Loss).
[2] | Reclassified to write-down of marketable securities on the Consolidated Statement of Income/(Loss) and Comprehensive Income/(Loss).

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- Definition Amount before tax and reclassification adjustments of unrealized holding gain (loss) on available-for-sale securities and unrealized holding gain (loss) related to transfers of securities into the available-for-sale classification and out of the held-to-maturity classification. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669646-108580 + Details
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- Definition Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities and unrealized holding gain (loss) related to transfers of securities into the available-for-sale classification and out of the held-to-maturity classification. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669646-108580 + Details
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- Definition Amount after tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e689-108580 + Details
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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, before tax effect. + References No definition available. + Details
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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References No definition available. + Details
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- Definition Accumulated other comprehensive income, net of tax due to change in fair market value + References No definition available. + Details
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- Definition Reclassifications Due To Write Down Of Marketable Securities + References No definition available. + Details
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- Definition Reclassifications Due To Write Down Of Marketable Securities Accumulated Other Comprehensive Income Net Of Tax + References No definition available. + Details
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