Stock-Based Compensation Plans - Stock Option and SARs Activities (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule Of Stock Option Activity [Line Items]
Beginning Balance, Shares	3,433,362	4,558,609	6,461,839
Granted, Shares	470,617	754,471	843,485
Exercised, Shares	(1,269,323)	(1,860,367)	(2,511,989)
Expired/forfeited, Shares	(52,582)	(19,351)	(234,726)
Ending Balance, Shares	2,582,074	3,433,362	4,558,609
Beginning Balance, Weighted Average Exercise Price	$ 52.52	$ 41.47	$ 37.20
Granted, Weighted Average Exercise Price	$ 75.82	$ 64.14	$ 51.17
Exercised, Weighted Average Exercise Price	$ 53.24	$ 30.20	$ 32.69
Expired/forfeited, Weighted Average Exercise Price	$ 53.56	$ 48.00	$ 52.65
Ending Balance, Weighted Average Exercise Price	$ 56.36	$ 52.52	$ 41.47