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Earnings Per Share (Narrative) (Details) (Stock options, restricted stock, and SARs [Member])
3 Months Ended
Mar. 31, 2015
Stock options, restricted stock, and SARs [Member]
 
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]  
Antidilutive securities excluded from computation of earnings per share 159,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= unt_StockoptionsrestrictedstockandSARsMember