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Earnings Per Share (Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share) (Details) (Stock options and SARs, USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Stock options and SARs
   
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings per share 291,770us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= unt_StockOptionsAndSarsMember
73,500us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= unt_StockOptionsAndSarsMember
Average exercise price $ 50.22unt_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice2
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= unt_StockOptionsAndSarsMember
$ 64.43unt_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice2
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= unt_StockOptionsAndSarsMember