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Summary of All Stock Option Activity (Detail) (Stock Options, USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Stock Options
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options Outstanding at December 31, 2012 1,882,554    
Granted, Number of shares 361,220 487,950 410,531
Exercised, Number of Options (85,917)    
Forfeited, Number of Options (82,975)    
Expired, Number of Options (75,194)    
Options Outstanding at December 31, 2013 1,999,688 1,882,554  
Options Exercisable, Number of Options, at December 31, 2013 1,235,826    
Options Outstanding at December 31, 2012 $ 11.92    
Granted, Weighted Average Exercise Price $ 9.61    
Exercised, Weighted Average Exercise Price $ 6.99    
Forfeited, Weighted Average Exercise Price $ 9.58    
Expired, Weighted Average Exercise Price $ 11.37    
Options Outstanding at December 31, 2013 $ 11.57 $ 11.92  
Options Exercisable,Weighted Average Exercise Price, at December 31, 2013 $ 12.88    
Options Outstanding,Weighted Average Remaining Contractual Life 6 years 6 years 2 months 12 days  
Options Exercisable, Weighted Average Remaining Contractual Life, at December 31, 2013 4 years 6 months    
Options Outstanding at December 31, 2012 $ 0.8    
Exercised, Aggregate Intrinsic Value 0.3 0.3 0.4
Options Outstanding at December 31, 2013 4.4 0.8  
Options Exercisable at December 31, 2013 $ 2.1