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Estimated Assumptions of Fair Value of Series C Preferred Share of 51.com (Detail) (Five One Network Development Co.Ltd, Series C Preferred Stock)
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12 Months Ended | |
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Dec. 31, 2011
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Dec. 31, 2010
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Five One Network Development Co.Ltd | Series C Preferred Stock
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| 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% |