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Stock Options and Restricted Stock - Additional Information (Detail) (USD $)
 3 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Incentive_Plan
Jun. 30, 2012
May 31, 2013
Executive Officer [Member]
Jun. 30, 2013
Non Employee Director [Member]
Non Employee Directors Restricted Stock Plan 2010 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of equity incentive plans     3      
Restricted common stock, granted shares         26,137 5,376
Market value of restricted shares granted     $ 200,000      
Stock options exercised, Shares     125,000 22,800    
Share-based compensation expense 400,000 100,000 700,000 200,000    
Proceeds from stock option exercises     $ 1,125,000 $ 205,000