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Derivatives Derivatives (Schedule of Subsequent Non-designated Hedges Outstanding (Details) (May'15 - Dec'15 [Member], Crude Oil [Member], Collar [Member], Subsequent Event [Member], WTI - NYMEX [Member])
 0 Months Ended
May 01, 2015
bbl
Derivative [Line Items]  
Hedged Volume (Bbl/day) 2,000unt_NotDesignatedasHedgingInstrumentHedgedVolumeofOil
Start [Member]
  
Derivative [Line Items]  
Weighted Average Price 58.00unt_NonDesignatedDerivativeInstrumentWeightedAverageFixedPriceForSwaps
/ unt_ExchangeAxis
= unt_WtiNymexMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= unt_CollarMember
/ us-gaap_RangeAxis
= unt_StartMember
/ unt_ReportDateAxis
= unt_May15Dec15Member
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_TradingActivityByTypeAxis
= us-gaap_CrudeOilMember
Commodity Derivatives Term May'15
End [Member]
  
Derivative [Line Items]  
Weighted Average Price 64.40unt_NonDesignatedDerivativeInstrumentWeightedAverageFixedPriceForSwaps
/ unt_ExchangeAxis
= unt_WtiNymexMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= unt_CollarMember
/ us-gaap_RangeAxis
= unt_EndMember
/ unt_ReportDateAxis
= unt_May15Dec15Member
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_TradingActivityByTypeAxis
= us-gaap_CrudeOilMember
Commodity Derivatives Term Dec'15