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Fair Value Measurements (Schedule Of Quantitative Information About Unobservable Inputs) (Details) (Natural Gas, Level 3, Collar, USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Derivative assets, Fair Value $ 3,355us-gaap_AssetsFairValueDisclosure [1]
Derivatives assets, Valuation Technique(s) Discounted cash flow [1]
Unobservable Input Forward commodity price curve [1]
Minimum
  
Derivative, Forward Price 0us-gaap_DerivativeForwardPrice
/ us-gaap_DerivativeInstrumentRiskAxis
= unt_CollarMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_TradingActivityByTypeAxis
= us-gaap_NaturalGasReservesMember
Maximum
  
Derivative, Forward Price 1.32us-gaap_DerivativeForwardPrice
/ 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 received within the settlement period.