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Stock-Based Employee Compensation - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Installment
Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Non stock-based compensation $ 0.3 $ 0.2 $ 0.8 $ 0.6
Number of installments of restricted shares     3  
Unrecognized compensation expense of restricted stock $ 1.6 $ 1.2 $ 1.6 $ 1.2
Fair market value of restricted shares granted     $ 2.34  
2005 Executive Incentive Compensation Plan [Member] | Restricted Stock [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock shares granted     568,430  
2005 Non-Employee Directors Restricted Stock Plan [Member] | RSU [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock shares granted     34,818  
Fair market value of restricted shares granted     $ 2.59