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Stock-based Compensation Expense - Activity in Non-Performance Based Restricted Stock Awards (Detail) (Restricted Stock And Restricted Stock Units, USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Restricted Stock And Restricted Stock Units
     
Shares      
Nonvested, beginning of period (in shares) 142,805    
Granted (in shares) 53,593    
Granted (in dollars per share) $ 63.17    
Vested (in shares) (51,416)    
Forfeited (in shares) (33,787)    
Nonvested, end of period (in shares) 111,195 142,805  
Weighted Average Grant Date Fair Value      
Nonvested, beginning of period (in dollars per share) $ 51.01    
Granted (in dollars per share) $ 3.4 $ 2.9 $ 3.7
Vested (in dollars per share) $ 41.48    
Forfeited (in dollars per share) $ 57.46    
Nonvested, end of period (in dollars per share) $ 59.32 $ 51.01