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CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Cash flows from operating activities: |  |  |
Non-cash impairments | $ 0 useg_DiscontinuedOperationLossGainOnWriteDown | $ 0 useg_DiscontinuedOperationLossGainOnWriteDown | $ 1,891 useg_DiscontinuedOperationLossGainOnWriteDown

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- Definition The loss (gain) resulting from the write-down of the carrying value of assets classified as a discontinued operation, to fair value less cost to sell. + References No definition available. + Details
Name: | useg_DiscontinuedOperationLossGainOnWriteDown
Namespace Prefix: | useg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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