Stock-Based Compensation Plans (Schedule Of Outstanding Options Into Two Ranges, Based On Exercise Prices) (Parenthetical) (Detail) (Outstanding Options With Range Based Exercise Prices Set Two [Member], USD $)	6 Months Ended
	Jun. 30, 2012
Outstanding Options With Range Based Exercise Prices Set Two [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit	$ 34.90
Exercise price range, upper range limit	$ 48.00