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Summary of Warrants and Related Information (Detail) (Warrant, USD $)
6 Months Ended
Jun. 30, 2014
Warrant
 
Warrants  
Beginning Balance 190,000
Granted   
Canceled   
Exercised (140,000)
Expired/Forfeited   
Ending balance 50,000
Exercisable at June 30, 2014 50,000
Weighted-Average Exercise Price  
Beginning balance $ 19.80
Granted   
Canceled   
Exercised $ 21.63
Expired/Forfeited   
Ending balance $ 14.67
Exercisable at June 30, 2014 $ 14.67