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
3 Months Ended
Mar. 31, 2014
OptionPlan
Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of stock option plans 1  
Closing stock price $ 9.99  
Total fair value of options vested $ 1.5 $ 0.8
Total unrecognized compensation cost related to non-vested awards of stock options $ 1.9  
Total unrecognized compensation cost related to non-vested awards of stock options, weighted average recognition period 1 year 9 months 18 days  
Stock Option
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares authorized under plan 5,000,000  
Minimum
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock option, historical volatility term 6 years  
Minimum | Stock Option
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share based compensation, vesting period 4 years  
Maximum
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock option, historical volatility term 10 years  
Maximum | Stock Option
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock options, term 5 years