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Stock-Based Compensation (Schedule Of Black-Scholes Assumptions Used For Stock Appreciation Rights Awards) (Detail)	6 Months Ended
	Jun. 30, 2012
Remeasurement [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	0.83%
Stock Appreciation Rights [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	1.01%
Estimated term (in years)	5 years 5 months 23 days
Estimated volatility	73.00%
Estimated dividend yield
Stock Appreciation Rights [Member] \| Remeasurement [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated term (in years)	5 years 5 months 1 day
Estimated volatility	71.00%
Estimated dividend yield

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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