XML 53 R27.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Basis of Presentation (Details) | Jun. 30, 2014
--- | ---
Basis of Presentation [Abstract] |
Percentage of ownership in entities for accounting under equity method, minimum (in hundredths) | 20.00%

X
- 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

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