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Basis of Presentation (Details)	Mar. 31, 2013
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