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Stock Options And Awards (Schedule Of Assumptions Used In Monte Carlo Simulation) (Detail) (Monte Carlo simulation [Member], USD $)	12 Months Ended
	Dec. 31, 2012
Monte Carlo simulation [Member]
Share Based Compensation Shares Authorized Under Award Type [Line Items]
Grant date	Oct. 26, 2012
Performance period	October 1, 2012 to September 30, 2015
Volatility	40.20%
Risk-free interest rate	0.40%
Grant date price	$ 69.55

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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