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Shareholder Rights Plan (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Shareholder Rights Plan [Abstract]  
Right of common stock one
Percentage of fair value of common stock that can be acquired 50.00%unt_PercentageOfFairValueOfCommonStockThatCanBeAcquired
Rights become exercisable period, in days 10 days
Minimum percentage of common stock that should be acquired 15.00%unt_MinimumPercentageOfCommonStockThatShouldBeAcquiredForShareholderRightsPlanToBeExercisable
Redemption price per share $ 0.01us-gaap_TemporaryEquityRedemptionPricePerShare
Shareholder rights plan expiration date May 19, 2015