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Acquisitions and Divestitures - Narrative (Details) (USD $)
 3 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
rig
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
rig
Dec. 31, 2013
rig
Dec. 31, 2012
Aug. 31, 2013
Sep. 30, 2012
Dec. 31, 2012
Jul. 24, 2012
Sep. 17, 2012
acre
locations
Business Combination, Description [Abstract]                                
Aggregate principal amount $ 650,000,000us-gaap_DebtInstrumentFaceAmount               $ 650,000,000us-gaap_DebtInstrumentFaceAmount              
Revenues 378,551,000us-gaap_Revenues 400,974,000us-gaap_Revenues 405,431,000us-gaap_Revenues 387,988,000us-gaap_Revenues 359,121,000us-gaap_Revenues 333,776,000us-gaap_Revenues 340,421,000us-gaap_Revenues 318,532,000us-gaap_Revenues 1,572,944,000us-gaap_Revenues 1,351,850,000us-gaap_Revenues 1,315,123,000us-gaap_Revenues          
Net income (42,551,000)us-gaap_NetIncomeLoss 67,522,000us-gaap_NetIncomeLoss 54,360,000us-gaap_NetIncomeLoss 56,945,000us-gaap_NetIncomeLoss 51,301,000us-gaap_NetIncomeLoss 34,232,000us-gaap_NetIncomeLoss 59,007,000us-gaap_NetIncomeLoss 40,206,000us-gaap_NetIncomeLoss 136,276,000us-gaap_NetIncomeLoss 184,746,000us-gaap_NetIncomeLoss 23,176,000us-gaap_NetIncomeLoss          
Asset Divestiture [Abstract]                                
Proceeds from divestiture of assets                 33,100,000us-gaap_ProceedsFromDivestitureOfBusinesses 21,700,000us-gaap_ProceedsFromDivestitureOfBusinesses            
Number of rigs sold                 4unt_NumberofRigsSold 5unt_NumberofRigsSold            
Gain (Loss) on Disposition of Property Plant Equipment                 9,600,000us-gaap_GainLossOnSaleOfPropertyPlantEquipment 16,500,000us-gaap_GainLossOnSaleOfPropertyPlantEquipment            
Number of rigs held for sale         4unt_Numberofrigsheldforsale         4unt_Numberofrigsheldforsale            
Net book value of drilling rigs sold                 16,300,000us-gaap_PropertyPlantAndEquipmentDisposals              
Bakken                                
Asset Divestiture [Abstract]                                
Proceeds from divestiture of assets                       57,100,000us-gaap_ProceedsFromDivestitureOfBusinesses
/ unt_AssetDivestitureGroupAxis
= unt_BakkenPropertiesMember		 226,600,000us-gaap_ProceedsFromDivestitureOfBusinesses
/ unt_AssetDivestitureGroupAxis
= unt_BakkenPropertiesMember		      
Brazos and Madison Counties                                
Asset Divestiture [Abstract]                                
Proceeds from divestiture of assets                         44,100,000us-gaap_ProceedsFromDivestitureOfBusinesses
/ unt_AssetDivestitureGroupAxis
= unt_BrazosAndMadisonCountiesMember		      
Noble Energy, Inc.                                
Business Combination, Description [Abstract]                                
Aggregate principal amount                             400,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_BusinessAcquisitionAxis
= unt_NobleEnergyIncMember		  
Revenues                           21,400,000us-gaap_Revenues
/ us-gaap_BusinessAcquisitionAxis
= unt_NobleEnergyIncMember		    
Net income                           (800,000)us-gaap_NetIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= unt_NobleEnergyIncMember		    
Noble Energy, Inc. | Granite Wash                                
Business Combination, Description [Abstract]                                
Land acquired (in acres)                               24,000us-gaap_AreaOfRealEstateProperty
/ us-gaap_BusinessAcquisitionAxis
= unt_NobleEnergyIncMember
/ unt_LocationOfLandAcquiredAxis
= unt_GraniteWashMember
Number of horizontal driling locations included in the land acquired                               600unt_NumberOfHorizontalDrilingLocationsIncludedInAcquiredLand
/ us-gaap_BusinessAcquisitionAxis
= unt_NobleEnergyIncMember
/ unt_LocationOfLandAcquiredAxis
= unt_GraniteWashMember
Noble Energy, Inc. | Other Plays                                
Business Combination, Description [Abstract]                                
Land acquired (in acres)                               59,000us-gaap_AreaOfRealEstateProperty
/ us-gaap_BusinessAcquisitionAxis
= unt_NobleEnergyIncMember
/ unt_LocationOfLandAcquiredAxis
= unt_OtherPlaysMember
Acquired land with existing production capacity, percent                               95.00%unt_AcquiredLandWithExistingProductionCapacityPercent
/ us-gaap_BusinessAcquisitionAxis
= unt_NobleEnergyIncMember
/ unt_LocationOfLandAcquiredAxis
= unt_OtherPlaysMember
Western Oklahoma and Texas Panhandle | Noble Energy, Inc.                                
Business Combination, Description [Abstract]                                
Land acquired (in acres)                               83,000us-gaap_AreaOfRealEstateProperty
/ us-gaap_BusinessAcquisitionAxis
= unt_NobleEnergyIncMember
/ us-gaap_StatementGeographicalAxis
= unt_WesternOklahomaAndTexasPanhandleMember
Total consideration given                               592,627,000unt_BusinessCombinationConsiderationTransferredatCombinationDate
/ us-gaap_BusinessAcquisitionAxis
= unt_NobleEnergyIncMember
/ us-gaap_StatementGeographicalAxis
= unt_WesternOklahomaAndTexasPanhandleMember
Proved developed reserves (BOE)                               44,000,000us-gaap_ProvedDevelopedReservesBOE1
/ us-gaap_BusinessAcquisitionAxis
= unt_NobleEnergyIncMember
/ us-gaap_StatementGeographicalAxis
= unt_WesternOklahomaAndTexasPanhandleMember
Natural gas gathering systems received as part of acquisition                               4unt_NaturalGasGatheringSystemsReceivedAsPartOfAcquisition
/ us-gaap_BusinessAcquisitionAxis
= unt_NobleEnergyIncMember
/ us-gaap_StatementGeographicalAxis
= unt_WesternOklahomaAndTexasPanhandleMember