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Stock-Based Compensation - Summary of Activity in Corporation's Active Stock Plans (Detail) (USD $)
9 Months Ended
Sep. 30, 2014
Sep. 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 42,490  
Cancelled/expired, Shares Available for Grant 0  
Ending Balance, Shares Available for Grant 2,804,450  
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 (491,675) (1,249,874)
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 (491,675)  
Stock awards vested, Number of Shares 0  
Forfeited, Number of Shares (42,490)  
Cancelled/expired, Number of Shares 0  
Ending Balance, Number of Shares 4,299,525  
Beginning Balance, Weighted-Average Exercise Price $ 54.35  
Granted, Weighted-Average Exercise Price $ 79.16  
Stock options exercised, Weighted-Average Exercise Price $ 52.01  
Stock awards vested, Weighted-Average Exercise Price $ 0  
Forfeited, Weighted-Average Exercise Price $ 56.21  
Cancelled/expired, Weighted-Average Exercise Price $ 0  
Ending Balance, Weighted-Average Exercise Price $ 55.15