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 6 Months Ended
Jun. 30, 2012
OptionPlan
Mar. 31, 2012
Jun. 30, 2012
Jun. 30, 2011
Jun. 29, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of stock option plan 1        
Class A and Class B common stock, dividend declared per share   $ 0.035      
Closing stock price         $ 5.47
Total fair value of options vested     $ 0.5 $ 0.8  
Total unrecognized compensation cost related to non-vested awards of stock options and restricted shares $ 2.0   $ 2.0    
Total unrecognized compensation cost related to non-vested awards of stock options and restricted shares, weighted average recognition period     2 years 110 days    
Restricted stock
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share based compensation, vesting period 1 year        
Stock Option
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Additional shares authorized under plan     1,900,000    
Stock Option | Minimum
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share based compensation, vesting period 4 years        
Stock option, historical volatility term 6 years        
Stock Option | Maximum
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares authorized under plan 5,000,000   5,000,000    
Share based compensation, vesting period 5 years        
Stock option, historical volatility term 10 years