v2.4.0.6

Estimated Assumptions of Fair Value of Series C Preferred Share of 51.com (Detail) (Five One Network Development Co.Ltd, Series C Preferred Stock) | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010
Five One Network Development Co.Ltd | Series C Preferred Stock |  |
Fair Value Measurements [Line Items] |  |
Risk-free interest rates | 0.72% | 1.27%
Expected volatility | 50.92% | 38.04%
- IPO | 25.00% | 50.00%
- Liquidation | 25.00% | 25.00%
- Redemption | 50.00% | 25.00%

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