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Income Tax (Rate Reconciliation) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Income taxed at statutory rates	$ (7,314)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ (28,916)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ (34,860)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Stock-based compensation	41us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	13us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	147us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost
Meals and entertainment	3us-gaap_IncomeTaxReconciliationNondeductibleExpenseMealsAndEntertainment	9us-gaap_IncomeTaxReconciliationNondeductibleExpenseMealsAndEntertainment	3us-gaap_IncomeTaxReconciliationNondeductibleExpenseMealsAndEntertainment
Loss related to Mexico		(2,632)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Other adjustments		(9)us-gaap_IncomeTaxReconciliationOtherAdjustments	6us-gaap_IncomeTaxReconciliationOtherAdjustments
Adjustments due to capital transactions		(60)vgz_AdjustmentsDueToCapitalTransactions	(733)vgz_AdjustmentsDueToCapitalTransactions
Imputed Interest	3vgz_ImputedInterest	3vgz_ImputedInterest	24vgz_ImputedInterest
Realized fx gain (loss) on intercompany balances		(3)vgz_RealizedFxGainLossOnIntercompanyBalances	(3)vgz_RealizedFxGainLossOnIntercompanyBalances
Prior year provision to actual adjustments	(4,511)vgz_PriorYearProvisionToActualAdjustments	9,961vgz_PriorYearProvisionToActualAdjustments	(40)vgz_PriorYearProvisionToActualAdjustments
Differences in tax rates	541vgz_DifferencesInTaxRates	3,451vgz_DifferencesInTaxRates	3,905vgz_DifferencesInTaxRates
Effect of foreign exchange	276vgz_EffectOfForeignExchange		(340)vgz_EffectOfForeignExchange
Change in effective tax rate	(1)us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate	(407)us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate	(333)us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate
Expiration of NOLs	189vgz_ExpirationOfNols	437vgz_ExpirationOfNols	70vgz_ExpirationOfNols
Income Tax Reconciliation, Change in Deferred Tax Assets Valuation Allowance	10,773us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	2,780us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	12,007us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Deferred Income Tax Expense (Benefit), Total		$ (15,373)us-gaap_DeferredIncomeTaxExpenseBenefit	$ (20,147)us-gaap_DeferredIncomeTaxExpenseBenefit

X

- Definition

Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

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