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Property, Plant and Equipment - Summary of Impairment Expense by Project (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Total Impairment | $ 160 us-gaap_AssetImpairmentCharges | $ 4,095 us-gaap_AssetImpairmentCharges
Kingsville Dome Project [Member] |  |
Total Impairment | 160 us-gaap_AssetImpairmentCharges / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = URRE_KingsvilleDomeprojectMember | 474 us-gaap_AssetImpairmentCharges / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = URRE_KingsvilleDomeprojectMember
Rosita Project [Member] |  |
Total Impairment |  | 2,821 us-gaap_AssetImpairmentCharges / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = URRE_RositaProjectMember
Vasquez Project [Member] |  |
Total Impairment |  | 276 us-gaap_AssetImpairmentCharges / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = URRE_VasquezProjectMember
Ambrosia Lake Project [Member] |  |
Total Impairment |  | 512 us-gaap_AssetImpairmentCharges / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = URRE_AmbrosiaLakeProjectMember
Other Project [Member] |  |
Total Impairment |  | $ 12 us-gaap_AssetImpairmentCharges / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = URRE_OtherProjectMember

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228 + Details
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