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Summary of All Restricted Stock Activity (Detail) (Restricted Stock, USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Restricted Stock
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options Outstanding at December 31, 2012 773,950    
Granted, Number of shares 521,181 404,250 377,869
Vested, Number of shares (62,183)    
Forfeited, Number of shares (86,017)    
Options Outstanding at December 31, 2013 1,146,931 773,950  
Options Outstanding at December 31, 2012 $ 9.89    
Granted, Weighted Average Grant Date Fair Value $ 9.63    
Vested, Weighted Average Grant Date Fair Value $ 6.19    
Forfeited, Weighted Average Grant Date Fair Value $ 8.78    
Options Outstanding at December 31, 2013 $ 10.06 $ 9.89