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15. STOCK OPTIONS (Detail) - Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2011 Minimum [Member]	Dec. 31, 2011 Maximum [Member]
Risk free rate	3.36%	2.66%	3.19%
Expected volatility	17.00%		39.00%
Dividend yield	0.00%		0.00%
Expected term in years	10 years		10 years

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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