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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES (Details) (USD $)
 12 Months Ended 3 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Mar. 31, 2013
Subsequent event
Short term bank loan agreements entered into between January 1, 2013 to March 31, 2013
Mar. 31, 2013
Subsequent event
Short term bank loan agreements entered into between January 1, 2013 to March 31, 2013
Repayment due in 2014
SUMMARY OF PRINCIPAL ACCOUNTING POLICIES            
Net loss $ 195,155,097 $ 90,903,374 $ (50,828,396)      
Cash used in operations (147,758,937) 60,124,114 (58,487,119)      
Cash and cash equivalents 141,968,182 343,994,679 288,651,701 160,110,887    
Restricted cash 422,356,794 178,270,427        
Bank borrowings due within one year 858,926,732 743,687,062        
Amount by which current liabilities exceeded current assets 98,045,603          
Basis of presentation            
Bank borrowings renewed and drew down         304,583,061  
Bank borrowings due beyond December 31, 2013           159,438,369
Allowance for doubtful receivables            
Receivable from Sinosure recorded in prepaid expenses and other current assets $ 9,515,899 $ 5,337,282 $ 4,212,532