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Other Investments (Summary Of Financial Information For Midas) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Total current assets | $ 11,362 us-gaap_AssetsCurrent | $ 9,844 us-gaap_AssetsCurrent |
Total non-current assets | 16,664 us-gaap_AssetsNoncurrent | 43,250 us-gaap_AssetsNoncurrent |
Total current liabilities | 2,743 us-gaap_LiabilitiesCurrent | 1,222 us-gaap_LiabilitiesCurrent |
Total non-current liabilities |  | 8,859 us-gaap_LiabilitiesNoncurrent |
Total equity | 25,283 us-gaap_StockholdersEquity | 43,013 us-gaap_StockholdersEquity |
Operating expense | (14,215)us-gaap_OperatingIncomeLoss | (22,149)us-gaap_OperatingIncomeLoss | (33,537)us-gaap_OperatingIncomeLoss
Net loss | (18,926)us-gaap_NetIncomeLoss | (59,488)us-gaap_NetIncomeLoss | (70,656)us-gaap_NetIncomeLoss
Midas Gold Corp [Member] |  |  |
Total current assets | 14,742 us-gaap_AssetsCurrent / dei_LegalEntityAxis = vgz_MidasGoldCorpMember | 19,864 us-gaap_AssetsCurrent / dei_LegalEntityAxis = vgz_MidasGoldCorpMember |
Total non-current assets | 186,673 us-gaap_AssetsNoncurrent / dei_LegalEntityAxis = vgz_MidasGoldCorpMember | 175,957 us-gaap_AssetsNoncurrent / dei_LegalEntityAxis = vgz_MidasGoldCorpMember |
Total current liabilities | 2,432 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = vgz_MidasGoldCorpMember | 5,108 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = vgz_MidasGoldCorpMember |
Total non-current liabilities | 919 us-gaap_LiabilitiesNoncurrent / dei_LegalEntityAxis = vgz_MidasGoldCorpMember | 380 us-gaap_LiabilitiesNoncurrent / dei_LegalEntityAxis = vgz_MidasGoldCorpMember |
Total equity | 198,064 us-gaap_StockholdersEquity / dei_LegalEntityAxis = vgz_MidasGoldCorpMember | 190,333 us-gaap_StockholdersEquity / dei_LegalEntityAxis = vgz_MidasGoldCorpMember |
Operating expense | 3,908 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = vgz_MidasGoldCorpMember | 7,813 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = vgz_MidasGoldCorpMember |
Net loss | $ 3,796 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = vgz_MidasGoldCorpMember | $ 7,180 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = vgz_MidasGoldCorpMember |

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