Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Additional Information (Detail)

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Stock-Based Compensation - Additional Information (Detail) (USD $)
Share data in Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Compensation Related Costs Share Based Payments Disclosure        
Number of stock based compensation plans in which instruments are outstanding 2   2  
Stock based compensation, outstanding stock options' expiration period     10 years  
Stock based compensation, outstanding stock options' expiration period upon optionee's separation from employment     90 days  
Stock compensation expense $ 716,000 $ 279,000 $ 1,133,866 $ 1,284,095
Unrecognized compensation cost related to unvested stock-based awards 2,600,000   2,600,000  
Unrecognized compensation cost related to unvested stock-based awards, weighted average recognition period     1 year 10 months 24 days  
Former President and CEO, David C. Bupp
       
Compensation Related Costs Share Based Payments Disclosure        
Stock compensation expense       $ 718,000
Stock Incentive Plan Nineteen Ninety Six
       
Compensation Related Costs Share Based Payments Disclosure        
Total number of shares authorized 1.5   1.5  
Stock Incentive Plan Nineteen Ninety Six | Minimum
       
Compensation Related Costs Share Based Payments Disclosure        
Stock based compensation, granted stock options' vesting period     1 year  
Stock Incentive Plan Nineteen Ninety Six | Maximum
       
Compensation Related Costs Share Based Payments Disclosure        
Stock based compensation, granted stock options' vesting period     4 years  
Third Amended and Restated Twenty Zero Two Stock Incentive Plan
       
Compensation Related Costs Share Based Payments Disclosure        
Total number of shares authorized 10.0   10.0  
Third Amended and Restated Twenty Zero Two Stock Incentive Plan | Minimum
       
Compensation Related Costs Share Based Payments Disclosure        
Stock based compensation, granted stock options' vesting period     1 year  
Third Amended and Restated Twenty Zero Two Stock Incentive Plan | Maximum
       
Compensation Related Costs Share Based Payments Disclosure        
Stock based compensation, granted stock options' vesting period     4 years