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Stock-Based Compensation - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Stock Based Compensation (Textual) [Abstract]        
Stock options granted, exercisable life     5 years  
Stock options vesting period     2 years  
Stock options, authorized 4,537,715   4,537,715  
Non-cash compensation expense $ 600,000 $ 400,000 $ 2,698,000 $ 2,600,000
Tax benefits related to stock based compensation     0  
Unrecognized compensation costs $ 3,300,000   $ 3,300,000  
Compensation costs expected to be recognized     2 years 7 months 6 days  
Restricted stocks granted     99,468  
Restricted Stock
       
Stock Based Compensation (Textual) [Abstract]        
Stock options granted, exercisable life     3 years  
Restricted stocks granted 0