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Stock-Based Compensation - Summary of Activity in Corporation's Active Stock Plans (Detail) (USD $)
6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning Balance, Shares Available for Grant 1,157,413  
Authorized, Shares Available for Grant 2,293,660  
Granted, Shares Available for Grant (5,500)  
Stock options exercised, Shares Available for Grant     
Stock awards vested, Shares Available for Grant     
Forfeited, Shares Available for Grant 30,375  
Cancelled/expired, Shares Available for Grant     
Ending Balance, Shares Available for Grant 3,475,948  
Beginning Balance, Director Deferred Stock Units Outstanding 27,724  
Granted, Director Deferred Stock Units Outstanding 5,500  
Stock options exercised, Director Deferred Stock Units Outstanding     
Stock awards vested, Director Deferred Stock Units Outstanding     
Forfeited, Director Deferred Stock Units Outstanding     
Cancelled/expired, Director Deferred Stock Units Outstanding     
Ending Balance, Director Deferred Stock Units Outstanding 33,224  
Stock options exercised, Number of Shares (662,224) (140,311)
Stock Options Outstanding [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning Balance, Number of Shares 5,513,516  
Granted, Number of Shares     
Stock options exercised, Number of Shares (662,224)  
Stock awards vested, Number of Shares     
Forfeited, Number of Shares (30,375)  
Cancelled/expired, Number of Shares     
Ending Balance, Number of Shares 4,820,917  
Beginning Balance, Weighted-Average Exercise Price $ 51.94  
Granted, Weighted-Average Exercise Price     
Stock options exercised, Weighted-Average Exercise Price $ 51.63  
Stock awards vested, Weighted-Average Exercise Price     
Forfeited, Weighted-Average Exercise Price $ 51.32  
Cancelled/expired, Weighted-Average Exercise Price     
Ending Balance, Weighted-Average Exercise Price $ 51.99  
Non-Vested Stock Awards/Stock Units Outstanding [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning Balance, Number of Shares 188,560  
Granted, Number of Shares     
Stock options exercised, Number of Shares     
Stock awards vested, Number of Shares     
Forfeited, Number of Shares     
Cancelled/expired, Number of Shares     
Ending Balance, Number of Shares 188,560  
Beginning Balance, Weighted-Average Grant-Date Fair Value $ 51.67  
Granted, Weighted-Average Grant-Date Fair Value     
Stock options exercised, Weighted-Average Grant-Date Fair Value     
Stock awards vested, Weighted-Average Grant-Date Fair Value     
Forfeited, Weighted-Average Grant-Date Fair Value     
Cancelled/expired, Weighted-Average Grant-Date Fair Value     
Ending Balance, Weighted-Average Grant-Date Fair Value $ 51.67