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Summary of Principal Accounting Policies (Details 5) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Customer deposits      
Customer deposits secured by right to purchase units of property in a development project at a prescribed price $ 33,038,106 $ 11,109,490  
Accounts receivable      
Allowance for doubtful accounts 35,953,537 14,164,988  
Unbilled accounts receivable 246,730,442 182,878,383  
Billed accounts receivable 57,870,268 61,202,482  
Total 304,600,710 244,080,865  
Properties held for sale      
Impairment of properties held for sale $ 0 $ 0 $ 0
Minimum
     
Investment in affiliates      
Ownership interest to represent significant influence (as a percent) 20.00%    
Ownership interest to represent more than minor influence for investments in investment funds (as a percent) 3.00%