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Assumptions For Stock Options Granted (Detail)	9 Months Ended
Assumptions For Stock Options Granted (Detail)	Sep. 30, 2012
Valuation Assumptions
Risk-free rate	0.90%
Expected volatility	48.50%
Expected term (years)	4 years 9 months
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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