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Minerals Property Expenditures - Schedule of Minerals Property Expenditures (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Total restoration/recovery expenses	$ 9URRE_RestorationAndRecoveryExpenses	$ 276URRE_RestorationAndRecoveryExpenses
Total standby care and maintenance expenses	311URRE_StandbyCareAndMaintenanceExpenses	368URRE_StandbyCareAndMaintenanceExpenses
Exploration and evaluation costs	220us-gaap_ExplorationAndProductionCosts
Land maintenance and holding costs	269URRE_LandMaintenanceAndHoldingCosts	236URRE_LandMaintenanceAndHoldingCosts
Total Mineral property expenses	809URRE_MineralPropertyExpenses	880URRE_MineralPropertyExpenses
Kingsville Dome Project [Member]
Total restoration/recovery expenses		247
Total standby care and maintenance expenses	128	135
Rosita Project [Member]
Total restoration/recovery expenses	9	2
Total standby care and maintenance expenses	94	161
Vasquez Project [Member]
Total restoration/recovery expenses		27
Total standby care and maintenance expenses	$ 89	$ 72