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Supplemental Oil And Gas Disclosures (Schedule Of The Oil And Natural Gas Property Costs Not Being Amortized) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Unproved properties acquired and wells in progress $ 485,568us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationCumulative $ 545,588us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationCumulative $ 521,659us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationCumulative
2014      
Unproved properties acquired and wells in progress 102,930us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationCumulative
/ unt_DateAcquiredAxis
= unt_A2014Member		    
2013 [Member]      
Unproved properties acquired and wells in progress 64,795us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationCumulative
/ unt_DateAcquiredAxis
= unt_A2013Member		    
2012 [Member]      
Unproved properties acquired and wells in progress 310,891us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationCumulative
/ unt_DateAcquiredAxis
= unt_A2012Member		    
2011 and prior [Member]      
Unproved properties acquired and wells in progress $ 6,952us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationCumulative
/ unt_DateAcquiredAxis
= unt_A2011andpriorMember