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Accounting for Stock-Based Compensation - Additional Information (Detail) (USD $)
3 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Jan. 31, 2013
2005 Stock Incentive Plan [Member]
Jun. 30, 2013
2005 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Purchase of company common stock           3,450,000
Annual increase in number of shares           400,000
Annual increase in number of shares percentage           4.00%
Share-based Compensation Arrangement by Share-based Payment Award, Other Share Increase (Decrease)         0  
Term of option     10 years      
Stock options granted 0 0          
Intrinsic value of outstanding options $ 0   $ 0      
Intrinsic value of exercisable options $ 0   $ 0      
Shares available for grant           809,172