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Investment In Equity Investees - Additional Information (Detail) (Yunfeng Fund)
12 Months Ended
Dec. 31, 2011
USD ($)
Dec. 31, 2011
CNY
Dec. 31, 2011
Minimum
Schedule of Equity Method Investments [Line Items]      
Percentage of equity invested 10.42% 10.42% 3.00%
Equity investment in total asset $ 484,772,626 3,051,110,433  
Equity investment in total liability 14,249,866 89,687,234  
Equity investment in operation $ 10,011,092 63,008,814