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Summary of Warrants and Related Information (Detail) (Warrant, USD $)
3 Months Ended
Mar. 31, 2014
Warrant
 
Warrants  
Beginning balance 190,000
Granted   
Canceled   
Exercised (85,000)
Expired/Forfeited   
Ending Balance 105,000
Exercisable at March 31, 2014 105,000
Weighted-Average Exercise Price  
Beginning balance $ 19.80
Granted   
Canceled   
Exercised $ (20.32)
Expired/Forfeited   
Exercisable at March 31, 2014 $ 19.38