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SHARE-BASED COMPENSATION (Schedule of Assumptions Used to Estimate Fair Value) (Details) (CNY)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value per share	3.17	2.38	2.20
Expected volatility	61.00%	52.00%	49.00%
Expected dividends
Expected life	2 years 7 months 13 days	2 years 8 months 16 days	2 years 11 months 1 day
Risk-free interest rate (per annum)	0.34%	0.93%	1.15%

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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