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
1 Months Ended 9 Months Ended
Aug. 30, 2012
May 31, 2012
Mar. 31, 2012
Sep. 30, 2012
OptionPlan
Sep. 30, 2011
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 $ 0.035 $ 0.035    
Closing stock price       $ 5.24  
Total fair value of options vested       $ 0.7 $ 0.8
Total unrecognized compensation cost related to non-vested awards of stock options and restricted shares       $ 1.6  
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  
Stock Option
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Additional shares authorized under plan       1,900,000  
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, historical volatility term       6 years  
Stock Option | Maximum
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share based compensation, vesting period       5 years  
Stock option, historical volatility term       10 years  
Restricted stock
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share based compensation, vesting period       1 year