v2.4.0.6

Short-Term Investments - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2011 USD ($) | Dec. 31, 2011 CNY | Dec. 31, 2010 CNY | Dec. 31, 2009 CNY
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Interest income | $ 16,238,410 | 102,202,930 | 136,097,898 | 102,200,467

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