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Summary Of Significant Accounting Policies (Narrative) (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Jun. 30, 2012
Dec. 31, 2014
contract
Unit
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Summary Of Significant Accounting Policies [Line Items]            
Number of daywork contracts     30unt_NumberofContractsDaywork      
Number of contracts, daywork expiring in one year     26unt_NumberofContractsDayworkExpiringinNextFiscalYear      
Number of contracts, daywork expiring in two years     4unt_NumberofContractsDayworkExpiringinTwoYears      
Book Overdrafts     $ 27,800,000us-gaap_BankOverdrafts $ 0us-gaap_BankOverdrafts    
Concentration of cash     18,400,000us-gaap_FairValueConcentrationOfRiskCashAndCashEquivalents 52,100,000us-gaap_FairValueConcentrationOfRiskCashAndCashEquivalents    
Minimum depreciation percentage for idle drilling rigs     20.00%unt_MinimumDepreciationPercentageForDrillingRigs      
Impairment of long-lived assets held-for-use     0us-gaap_ImpairmentOfLongLivedAssetsHeldForUse 0us-gaap_ImpairmentOfLongLivedAssetsHeldForUse    
Interest Costs Capitalized     32,200,000us-gaap_InterestCostsCapitalized 33,700,000us-gaap_InterestCostsCapitalized 18,900,000us-gaap_InterestCostsCapitalized  
Goodwill impairment     0us-gaap_GoodwillImpairmentLoss 0us-gaap_GoodwillImpairmentLoss 0us-gaap_GoodwillImpairmentLoss  
Additions to goodwill     0us-gaap_GoodwillAcquiredDuringPeriod 0us-gaap_GoodwillAcquiredDuringPeriod 0us-gaap_GoodwillAcquiredDuringPeriod  
Goodwill deductible for tax purposes     3,100,000us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount      
Intangible asset impairment     0us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill 0us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill 0us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill  
Amortization on intangible assets     0us-gaap_AmortizationOfIntangibleAssets 700,000us-gaap_AmortizationOfIntangibleAssets 1,200,000us-gaap_AmortizationOfIntangibleAssets  
Accumulated amortization on intangible assets 17,300,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization     18,000,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization 17,300,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization  
Directly related overhead costs capitalized 17,600,000us-gaap_CapitalizedCostsWellsAndRelatedEquipmentAndFacilities   23,700,000us-gaap_CapitalizedCostsWellsAndRelatedEquipmentAndFacilities 21,500,000us-gaap_CapitalizedCostsWellsAndRelatedEquipmentAndFacilities 17,600,000us-gaap_CapitalizedCostsWellsAndRelatedEquipmentAndFacilities  
Average rates used for depreciation, depletion, and amortization per Boe     14.82unt_OilAndGasPropertiesAverageDepreciationDepletionAndAmortizationRate 13.32unt_OilAndGasPropertiesAverageDepreciationDepletionAndAmortizationRate 14.70unt_OilAndGasPropertiesAverageDepreciationDepletionAndAmortizationRate  
Unproved properties not being amortized 521,659,000us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationCumulative   485,568,000us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationCumulative 545,588,000us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationCumulative 521,659,000us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationCumulative  
Future discounted net cash flows discounted     10.00%unt_OilAndGasPropertyFullCostMethodDiscountPercentage      
Impairment of oil and natural gas properties 167,700,000us-gaap_ImpairmentOfOilAndGasProperties 115,900,000us-gaap_ImpairmentOfOilAndGasProperties 76,683,000us-gaap_ImpairmentOfOilAndGasProperties 0us-gaap_ImpairmentOfOilAndGasProperties 283,606,000us-gaap_ImpairmentOfOilAndGasProperties  
Non-cash ceiling test write-down net of tax 104,400,000unt_NonCashCeilingTestWriteDownNetOfTax 72,100,000unt_NonCashCeilingTestWriteDownNetOfTax 47,700,000unt_NonCashCeilingTestWriteDownNetOfTax   176,500,000unt_NonCashCeilingTestWriteDownNetOfTax  
Effects of cash flow hedges 29,800,000unt_EffectsOfCashFlowHedgesUsedInCalculatingCeilingLimitationAmount 32,500,000unt_EffectsOfCashFlowHedgesUsedInCalculatingCeilingLimitationAmount        
Unproved properties included in amortization     73,700,000unt_Capitalizedcostsofunprovedpropertiesincludedinamortizationcumulative      
Revenues from transactions with operating segments of same entity     89,500,000unt_Revenuesfromtransactionswithoperatingsegmentsofsameentity 64,300,000unt_Revenuesfromtransactionswithoperatingsegmentsofsameentity 49,600,000unt_Revenuesfromtransactionswithoperatingsegmentsofsameentity  
Eliminated associated operating expense     62,400,000unt_EliminatedAssociatedOperatingExpense 46,900,000unt_EliminatedAssociatedOperatingExpense 34,100,000unt_EliminatedAssociatedOperatingExpense  
Eliminated yielding     27,100,000unt_EliminatedYielding 17,400,000unt_EliminatedYielding 15,500,000unt_EliminatedYielding  
Number of partnerships     15unt_NumberOfPartnerships      
Unrecognized Tax Benefits 0us-gaap_UnrecognizedTaxBenefits   410,000us-gaap_UnrecognizedTaxBenefits 0us-gaap_UnrecognizedTaxBenefits 0us-gaap_UnrecognizedTaxBenefits 0us-gaap_UnrecognizedTaxBenefits
Minimum            
Summary Of Significant Accounting Policies [Line Items]            
Number of days for drilling of one well     20 days      
Duration length of contracts     6 months      
Insurance coverage     0us-gaap_SelfInsuranceReserve
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		      
Maximum            
Summary Of Significant Accounting Policies [Line Items]            
Number of days for drilling of one well     90 days      
Duration length of contracts     3 years      
Insurance coverage     1,500,000us-gaap_SelfInsuranceReserve
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		      
Under-Produced Properties [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Natural gas balancing (MMcf)     5,100us-gaap_GasImbalanceVolumeAmount
/ us-gaap_ReserveQuantitiesByTypeOfReserveAxis
= unt_UnderProducedPropertiesMember		      
Over-Produced Properties [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Natural gas balancing (MMcf)     4,400us-gaap_GasImbalanceVolumeAmount
/ us-gaap_ReserveQuantitiesByTypeOfReserveAxis
= unt_OverProducedPropertiesMember		      
Natural Gas Balancing [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Accounts receivable     2,000,000us-gaap_AccountsReceivableNet
/ us-gaap_ReserveQuantitiesByTypeOfReserveAxis
= unt_NaturalGasBalancingMember		      
Liability recognized to under production     3,600,000us-gaap_GasImbalancePayableCurrentAndNoncurrent
/ us-gaap_ReserveQuantitiesByTypeOfReserveAxis
= unt_NaturalGasBalancingMember		      
Jul'12 - Dec'12 [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Portion of future oil and gas production being hedged, as of the reporting period (MMBoe)   2.9unt_PortionOfFutureOilAndGasProductionBeingHedgedAsOfReportingPeriod
/ unt_HedgeCoveringPeriodAxis
= unt_JulyTwoThousandTwelveToDecemberTwoThousandTwelveMember		        
Jan'13 - Dec'13 [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Portion of future oil and gas production being hedged, as of the reporting period (MMBoe) 6.9unt_PortionOfFutureOilAndGasProductionBeingHedgedAsOfReportingPeriod
/ unt_HedgeCoveringPeriodAxis
= unt_JanuaryTwoThousandThirteenToDecemberTwoThousandThirteenMember		 4.5unt_PortionOfFutureOilAndGasProductionBeingHedgedAsOfReportingPeriod
/ unt_HedgeCoveringPeriodAxis
= unt_JanuaryTwoThousandThirteenToDecemberTwoThousandThirteenMember		        
Drilling Equipment | Minimum            
Summary Of Significant Accounting Policies [Line Items]            
Useful life, years     15 years      
Property, Plant and Equipment, Other Types [Member] | Minimum            
Summary Of Significant Accounting Policies [Line Items]            
Useful life, years     3 years      
Property, Plant and Equipment, Other Types [Member] | Maximum            
Summary Of Significant Accounting Policies [Line Items]            
Useful life, years     15 years      
Drilling Equipment            
Summary Of Significant Accounting Policies [Line Items]            
Number of drilling rigs removed from service     31unt_Numberofdrillingrigsremovedfromservice
/ us-gaap_StatementBusinessSegmentsAxis
= unt_DrillingEquipmentMember		      
Impairment of long-lived assets held-for-use     74,300,000us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
/ us-gaap_StatementBusinessSegmentsAxis
= unt_DrillingEquipmentMember		      
Gas Gathering and Processing Equipment            
Summary Of Significant Accounting Policies [Line Items]            
Impairment of long-lived assets held-for-use     $ 7,100,000us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_GasGatheringAndProcessingEquipmentMember		 $ 0us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_GasGatheringAndProcessingEquipmentMember		 $ 1,200,000us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_GasGatheringAndProcessingEquipmentMember		  
Number of gas gathering systems impaired     3unt_Numberofgasgatheringsystemsimpaired
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_GasGatheringAndProcessingEquipmentMember