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Fair Value Accounting (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
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Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Mill equipment | $ 6,500 | $ 6,500
Level 3 percentage of fair value assets | 41.00% |
Fair Value, Inputs, Level 3 [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Mill equipment | $ 6,500 | $ 6,500

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- Definition Represents the sum of the carrying value of all the Assets Held-for-Sale at the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
Name: | us-gaap_AssetsHeldForSaleAtCarryingValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of total fair value assets that are classified as level 3. + References No definition available. + Details
Name: | vgz_Level3PercentageOfFairValueAssets
Namespace Prefix: | vgz_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant