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Transactions With Related Parties Transactions With Related Parties (Schedule of Amount Received in Public and Private Partnerships) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Related Party Transaction [Line Items]      
Contract drilling $ 4unt_ContractDrillingFees $ 16unt_ContractDrillingFees $ 246unt_ContractDrillingFees
Well supervision and other fees 435unt_WellSupervisionAndOtherFees 470unt_WellSupervisionAndOtherFees 434unt_WellSupervisionAndOtherFees
General and administrative expense reimbursement $ 39unt_GeneralAndAdministrativeExpenseReimbursement $ 36unt_GeneralAndAdministrativeExpenseReimbursement $ 39unt_GeneralAndAdministrativeExpenseReimbursement