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Summary of All Stock Option Activity (Detail) (Stock Option, USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Stock Option
      
Option Outstanding at December 31, 2011 1,924,825    
Granted, Number of Options 487,950 410,531 10,000
Exercised, Number of Options (81,482)    
Forfeited, Number of Options (4,626)    
Expired, Number of Options (444,113)    
Option Outstanding at December 31, 2012 1,882,554 1,924,825  
Options Exercisable, Number of Options, at December 31, 2012 1,122,138    
Option Outstanding at December 31, 2011 $ 12.02    
Granted, Weighted Average Exercise Price $ 10.55    
Exercised, Weighted Average Exercise Price $ 4.33    
Forfeited, Weighted Average Exercise Price $ 14.85    
Expired, Weighted Average Exercise Price $ 12.2    
Option Outstanding at December 31, 2012 $ 11.92 $ 12.02  
Options Exercisable,Weighted Average Exercise Price, at December 31, 2012 $ 12.95    
Options Outstanding,Weighted Average Remaining Contractual Life, at December 31, 2011 5 years 1 month 6 days    
Options Outstanding,Weighted Average Remaining Contractual Life, at December 31, 2012 6 years 2 months 12 days    
Options Exercisable, Weighted Average Remaining Contractual Life, at December 31, 2012 4 years 4 months 24 days    
Options Outstanding at December 31, 2011 $ 0.8    
Exercised, Aggregate Intrinsic Value 0.3 0.4 0.4
Options Outstanding at December 31, 2012 0.8 0.8  
Options Exercisable at December 31, 2012 $ 0.7