Quarterly report pursuant to Section 13 or 15(d)

Stock Option Plan - Additional Information (Detail)

v2.4.0.6
Stock Option Plan - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2013
OptionPlan
Mar. 31, 2012
Mar. 28, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of stock option plans 1    
Closing stock price     $ 7.93
Total fair value of options vested $ 0.5 $ 0.5  
Total unrecognized compensation cost related to non-vested awards of stock options and restricted shares $ 4.3    
Total unrecognized compensation cost related to non-vested awards of stock options and restricted shares, weighted average recognition period 2 years 2 months 12 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