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Employee Benefit Plans (Summary of Activity in Corporation's Active Stock Plans) (Detail) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Beginning Balance, Shares Available for Grant 1,157,413 1,963,455 2,759,347
Authorized, Shares Available for Grant 2,293,660    
Granted, Shares Available for Grant (635,360) (825,542) (868,267)
Forfeited, Shares Available for Grant 46,890 19,750 73,250
Cancelled/expired, Shares Available for Grant   (250) (875)
Ending Balance, Shares Available for Grant 2,862,603 1,157,413 1,963,455
Beginning Balance, Director Deferred Stock Units Outstanding 27,724 22,092 16,515
Granted, Director Deferred Stock Units Outstanding 5,500 5,632 5,577
Ending Balance, Director Deferred Stock Units Outstanding 33,224 27,724 22,092
Stock options exercised, Number of Shares (1,319,786) (206,336) (148,203)
Beginning Balance, Weighted-Average Grant-Date Fair Value $ 11.07 $ 9.78  
Ending Balance, Weighted-Average Grant-Date Fair Value $ 13.74 $ 11.07 $ 9.78
Non-Vested Stock Awards/ Stock Units Outstanding [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Beginning Balance, Number of Shares 188,560 169,530 227,550
Granted, Number of Shares 38,010 49,130 56,300
Stock awards vested, Number of Shares (26,830) (30,100) (114,320)
Ending Balance, Number of Shares 199,740 188,560 169,530
Beginning Balance, Weighted-Average Grant-Date Fair Value $ 51.67 $ 50.33 $ 51.10
Granted, Weighted-Average Grant-Date Fair Value $ 71.39 $ 54.56 $ 48.00
Stock awards vested, Weighted-Average Grant-Date Fair Value $ 50.64 $ 52.44 $ 50.19
Ending Balance, Weighted-Average Grant-Date Fair Value $ 55.32 $ 51.67 $ 50.33
Stock Options Outstanding [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Beginning Balance, Number of Shares 5,513,516 4,968,822 4,383,885
Granted, Number of Shares 591,850 770,780 806,390
Stock options exercised, Number of Shares (1,319,786) (206,336) (148,203)
Forfeited, Number of Shares (46,890) (19,750) (73,250)
Ending Balance, Number of Shares 4,738,690 5,513,516 4,968,822
Beginning Balance, Weighted-Average Exercise Price $ 51.94 $ 51.49 $ 52.08
Granted, Weighted-Average Exercise Price $ 71.38 $ 54.56 $ 48.02
Stock options exercised, Weighted-Average Exercise Price $ 52.02 $ 50.96 $ 50.18
Forfeited, Weighted-Average Exercise Price $ 46.05 $ 50.49 $ 51.43
Ending Balance, Weighted-Average Exercise Price $ 54.35 $ 51.94 $ 51.49