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Basis of Presentation (Details) | Jun. 30, 2013
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Basis of Presentation [Abstract] |
Percentage of ownership in entities for accounting under equity method, minimum (in hundredths) | 20.00%

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- Definition Represents the minimum percentage of ownership in entities for accounting under equity method. + References No definition available. + Details
Name: | useg_MinimumPercentageOfOwnershipInEntitiesForAccountingUnderEquityMethod
Namespace Prefix: | useg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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