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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	$ 11,362us-gaap_AssetsCurrent	$ 9,844us-gaap_AssetsCurrent
Total non-current assets	16,664us-gaap_AssetsNoncurrent	43,250us-gaap_AssetsNoncurrent
Total current liabilities	2,743us-gaap_LiabilitiesCurrent	1,222us-gaap_LiabilitiesCurrent
Total non-current liabilities		8,859us-gaap_LiabilitiesNoncurrent
Total equity	25,283us-gaap_StockholdersEquity	43,013us-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	14,742us-gaap_AssetsCurrent / dei_LegalEntityAxis = vgz_MidasGoldCorpMember	19,864us-gaap_AssetsCurrent / dei_LegalEntityAxis = vgz_MidasGoldCorpMember
Total non-current assets	186,673us-gaap_AssetsNoncurrent / dei_LegalEntityAxis = vgz_MidasGoldCorpMember	175,957us-gaap_AssetsNoncurrent / dei_LegalEntityAxis = vgz_MidasGoldCorpMember
Total current liabilities	2,432us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = vgz_MidasGoldCorpMember	5,108us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = vgz_MidasGoldCorpMember
Total non-current liabilities	919us-gaap_LiabilitiesNoncurrent / dei_LegalEntityAxis = vgz_MidasGoldCorpMember	380us-gaap_LiabilitiesNoncurrent / dei_LegalEntityAxis = vgz_MidasGoldCorpMember
Total equity	198,064us-gaap_StockholdersEquity / dei_LegalEntityAxis = vgz_MidasGoldCorpMember	190,333us-gaap_StockholdersEquity / dei_LegalEntityAxis = vgz_MidasGoldCorpMember
Operating expense	3,908us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = vgz_MidasGoldCorpMember	7,813us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = vgz_MidasGoldCorpMember
Net loss	$ 3,796us-gaap_NetIncomeLoss / dei_LegalEntityAxis = vgz_MidasGoldCorpMember	$ 7,180us-gaap_NetIncomeLoss / dei_LegalEntityAxis = vgz_MidasGoldCorpMember

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