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Commitments And Contingencies (Details)
 1 Months Ended 3 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended
Jun. 17, 2011
claim
May 12, 2011
employee
claim
Dec. 31, 2012
USD ($)
Mar. 31, 2012
USD ($)
plaintiff
Dec. 31, 2012
USD ($)
May 12, 2011
AMSC Windtec [Member]
USD ($)
May 12, 2011
AMSC Windtec [Member]
EUR (€)
Sep. 16, 2011
Dalian Guotong Electric Co. Ltd. [Member]
USD ($)
Sep. 16, 2011
Dalian Guotong Electric Co. Ltd. [Member]
CNY
Dec. 22, 2011
Sinovel Wind Group Co. Ltd. [Member]
USD ($)
Dec. 22, 2011
Sinovel Wind Group Co. Ltd. [Member]
CNY
Oct. 17, 2011
Sinovel Wind Group Co. Ltd. [Member]
USD ($)
Oct. 17, 2011
Sinovel Wind Group Co. Ltd. [Member]
CNY
Oct. 08, 2011
Sinovel Wind Group Co. Ltd. [Member]
USD ($)
Oct. 08, 2011
Sinovel Wind Group Co. Ltd. [Member]
CNY
Sep. 13, 2011
Sinovel Wind Group Co. Ltd. [Member]
USD ($)
Sep. 13, 2011
Sinovel Wind Group Co. Ltd. [Member]
CNY
Mar. 31, 2011
Sinovel Wind Group Co. Ltd. [Member]
USD ($)
Mar. 31, 2011
Sinovel Wind Group Co. Ltd. [Member]
CNY
Dec. 31, 2012
Letter Of Credit [Member]
USD ($)
Dec. 31, 2012
Purchase Commitment [Member]
USD ($)
Dec. 31, 2012
Purchase Commitment [Member]
EUR (€)
Commitments And Contingencies [Line Items]                                            
Adverse purchase commitments     $ (1,799,000) $ (25,894,000) $ (1,799,000)                                  
Accrual for adverse purchase commitments     10,300,000   24,100,000                                  
Settlement amount                                           2,200,000
Common stock issued to vendor                                         765,301 765,301
Shortfall payment                                         800,000  
Borrowing capacity                                       9,000,000   2,200,000
Letter of credit expiration date                                       Jan. 31, 2013 Dec. 31, 2012 Dec. 31, 2012
Cash collateral                                       8,500,000 3,000,000  
Number of vendors filing suits       3                                    
Potential loss, minimum     0   0                                  
Potential loss, maximum     2,000,000   2,000,000                                  
Number of putative securities complaints 4 7                                        
Number of officers putative securities filed against   2                                        
Number of complaints additionally asserted claims against the underwriters   1                                        
Number of claims consolidated 3                                          
Monetary damages due to breaches of contracts                                   76,000,000 485,000,000      
Value of the undelivered components                                   720,000,000 4,600,000,000      
Claim amount per request for arbitration           24,000,000 18,000,000     190,000,000 1,200,000,000 157,000,000 1,000,000,000 58,000,000 370,000,000              
Net amount of damages claimed                   17,000,000 105,000,000                      
Damages claimed for unauthorized use of software               200,000 1,200,000             6,000,000 38,000,000          
Monetary damages for trade secret infringement                               453,000,000 2,900,000,000          
Counterclaims under License Agreement           9,000,000 6,000,000                              
Restricted cash included in current assets     9,154,000 12,086,000 9,154,000                                  
Restricted cash included in long-term assets     $ 4,820,000 $ 2,540,000 $ 4,820,000