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Fair Value Measurements (Schedule Of Quantitative Information About Unobservable Inputs) (Details) (Natural Gas [Member], Level 3 [Member], Collar [Member], USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Derivative fair value $ 857us-gaap_DerivativeFairValueOfDerivativeNet [1]
Derivatives Valuation Technique(s) Discounted cash flow
Unobservable Input Forward commodity price curve
Minimum [Member]
  
Forward commodity price curve 0.00unt_ForwardCommodityPriceCurve
/ us-gaap_DerivativeInstrumentRiskAxis
= unt_CollarMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_TradingActivityByTypeAxis
= us-gaap_NaturalGasReservesMember
Maximum [Member]
  
Forward commodity price curve 0.38unt_ForwardCommodityPriceCurve
/ us-gaap_DerivativeInstrumentRiskAxis
= unt_CollarMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_TradingActivityByTypeAxis
= us-gaap_NaturalGasReservesMember
[1] The commodity contracts detailed in this category include non-exchange-traded natural gas collars that are valued based on NYMEX. The forward pricing range represents the low and high price expected to be paid or received within the settlement period.