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Stock-Based Compensation - Summary of Activity in Corporation's Active Stock Plans (Detail) (USD $)
6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning Balance, Shares Available for Grant 2,862,603  
Authorized, Shares Available for Grant 0  
Granted, Shares Available for Grant (100,643)  
Stock options exercised, Shares Available for Grant 0  
Stock awards vested, Shares Available for Grant 0  
Forfeited, Shares Available for Grant 40,220  
Cancelled/expired, Shares Available for Grant 0  
Ending Balance, Shares Available for Grant 2,802,180  
Beginning Balance, Director Deferred Stock Units Outstanding 33,224  
Granted, Director Deferred Stock Units Outstanding 5,643  
Stock options exercised, Director Deferred Stock Units Outstanding 0  
Stock awards vested, Director Deferred Stock Units Outstanding 0  
Forfeited, Director Deferred Stock Units Outstanding 0  
Cancelled/expired, Director Deferred Stock Units Outstanding 0  
Ending Balance, Director Deferred Stock Units Outstanding 38,867  
Stock options exercised, Number of Shares (384,775) (662,224)
Non-Vested Stock Awards/Stock Units Outstanding [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning Balance, Number of Shares 199,740  
Granted, Number of Shares 0  
Stock options exercised, Number of Shares 0  
Stock awards vested, Number of Shares 0  
Forfeited, Number of Shares 0  
Cancelled/expired, Number of Shares 0  
Ending Balance, Number of Shares 199,740  
Beginning Balance, Weighted-Average Grant-Date Fair Value $ 55.32  
Granted, Weighted-Average Grant-Date Fair Value $ 0  
Stock options exercised, Weighted-Average Grant-Date Fair Value $ 0  
Stock awards vested, Weighted-Average Grant-Date Fair Value $ 0  
Forfeited, Weighted-Average Grant-Date Fair Value $ 0  
Cancelled/expired, Weighted-Average Grant-Date Fair Value $ 0  
Ending Balance, Weighted-Average Grant-Date Fair Value $ 55.32  
Stock Options Outstanding [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning Balance, Number of Shares 4,738,690  
Granted, Number of Shares 95,000  
Stock options exercised, Number of Shares (384,775)  
Stock awards vested, Number of Shares 0  
Forfeited, Number of Shares (40,220)  
Cancelled/expired, Number of Shares 0  
Ending Balance, Number of Shares 4,408,695  
Beginning Balance, Weighted-Average Exercise Price $ 54.35  
Granted, Weighted-Average Exercise Price $ 79.16  
Stock options exercised, Weighted-Average Exercise Price $ 52.26  
Stock awards vested, Weighted-Average Exercise Price $ 0  
Forfeited, Weighted-Average Exercise Price $ 56.08  
Cancelled/expired, Weighted-Average Exercise Price $ 0  
Ending Balance, Weighted-Average Exercise Price $ 55.05