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Summary of All Restricted Stock Activity (Detail) (Restricted Stock, USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Restricted Stock
      
Option Outstanding at December 31, 2011 558,618    
Granted, Number of shares 404,250 377,869 10,000
Vested, Number of shares (186,368)    
Forfeited, Number of shares (2,550)    
Option Outstanding at December 31, 2012 773,950 558,618  
Option Outstanding at December 31, 2011 $ 7.98    
Granted, Weighted Average Grant Date Fair Value $ 9.83    
Vested, Weighted Average Grant Date Fair Value $ 4.01    
Forfeited, Weighted Average Grant Date Fair Value $ 10.41    
Option Outstanding at December 31, 2012 $ 9.89 $ 7.98