Quarterly report pursuant to Section 13 or 15(d)

Stock Incentive Plan - Additional Information (Detail)

v2.4.0.8
Stock Incentive Plan - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
9 Months Ended
Sep. 30, 2013
OptionPlan
Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of stock option plans 1  
Closing stock price $ 8.28  
Total fair value of options vested $ 0.8 $ 0.5
Total unrecognized compensation cost related to non-vested awards of stock options $ 3.0  
Total unrecognized compensation cost related to non-vested awards of stock options, weighted average recognition period 1 year 10 months 24 days  
Minimum
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock option, historical volatility term 6 years  
Maximum
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock option, historical volatility term 10 years  
Stock Option
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares authorized under plan 5,000,000  
Stock Option | Minimum
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share based compensation, vesting period 4 years  
Stock Option | Maximum
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock options, term 5 years  
Restricted stock
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share based compensation, vesting period 1 year