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Earnings Per Share (Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share) (Details) (Stock options and SARs, USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Stock options and SARs
     
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Options and SARs 73,500us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= unt_StockOptionsAndSarsMember
149,665us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= unt_StockOptionsAndSarsMember
250,901us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= unt_StockOptionsAndSarsMember
Average Exercise Price $ 64.43unt_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice2
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= unt_StockOptionsAndSarsMember
$ 58.41unt_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice2
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= unt_StockOptionsAndSarsMember
$ 52.72unt_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice2
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= unt_StockOptionsAndSarsMember