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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Operating activities:      
Net income (loss) $ (90,903,374) $ 50,828,396 $ 22,778,199
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:      
Depreciation and amortization 56,117,280 31,266,181 20,508,383
Loss on disposal of property, plant and equipment 1,223,163 194,243 174,292
Loss (Gain) on change in fair value of derivatives 5,750,981 (1,656,928) (9,870,333)
Investment loss (income) 41,163 2,853,403 (1,788,036)
Allowance for doubtful debts 23,156,857 3,046,100 18,076,416
Write-down of inventories 8,456,260 2,101,124 12,478,944
Provision for firm purchase commitments 10,610,410 1,562,002 13,822,818
Amortization of discount on debt 44,485 39,816 35,638
Share-based compensation 4,060,838 3,876,671 5,436,350
Changes in operating assets and liabilities:      
Inventories (28,798,943) (103,637,355) (83,970,843)
Accounts receivable (103,748,565) (5,704,039) (116,463,362)
Amount due from related parties (18,135,684) (1,347,828)  
Value added tax recoverable 28,508,062 (1,828,277) (21,981,216)
Advances to suppliers 13,458,006 2,227,991 6,751,157
Other non-current assets (9,257,048) (5,826,029)  
Accounts receivable, unbilled (88,503,888)    
Prepaid expenses and other current assets (2,969,210) (6,424,395) (15,111,379)
Accounts payable 52,435,834 18,096,208 62,855,936
Short-term notes payable 118,154,508 (96,011,517) 104,588,587
Other payables 20,699,554 10,979,862 9,065,342
Advances from customers 56,706,824 5,120,313 65,703
Amounts due to related parties 484,649 2,163,515 166,900
Accrued warranty costs 15,737,987 14,259,880 6,051,483
Provision for firm purchase commitments (27,862,017)    
Loss contingency accruals 27,862,017    
Other current liabilities (744,073) 18,875,491 8,452,665
Prepaid land use right 229,241 (454,803) 258,520
Liability for uncertain tax positions 840,611 755,414 2,001,086
Deferred taxes (4,632,976) (5,179,877) (10,834,919)
Settlement of foreign currency derivatives (8,898,838) 1,337,319 17,367,159
Net cash provided by (used in) operating activities 60,124,114 (58,487,119) 50,915,490
Investing activities:      
Decrease (increase) in restricted cash 23,614,897 (987,019) (158,622,411)
Payment to acquire subsidiaries (6,104,823)    
Investment in affiliates (5,667,627) (1,503,531) (4,100,084)
Proceeds from disposal of investment   2,524,541 148,898
Purchase of property, plant and equipment (205,419,189) (134,314,791) (72,214,660)
Proceeds from disposal of property, plant and equipment   291,846 220,027
Net cash used in investing activities (193,576,742) (133,988,954) (234,568,230)
Financing activities:      
Proceeds from short-term borrowings 1,808,463,199 917,514,400 481,721,660
Repayment of short-term borrowings (1,721,463,494) (695,513,690) (371,676,212)
Proceeds from long-term borrowings 89,023,852 89,659,607 14,633,000
Sales of subsidiary shares to non-controlling interest   145,128 9,173
Capital contribution from non-controlling interest 467,720    
Proceeds from issuance of common shares     103,349,924
Issuance costs paid for common shares offering     (538,581)
Proceeds from exercise of stock options 1,256,948 823,560 674,424
Net cash provided by financing activities 177,748,225 312,629,005 228,173,388
Effect of exchange rate changes 11,047,381 8,387,882 (70,682)
Net increase in cash and cash equivalents 55,342,978 128,540,814 44,449,966
Cash and cash equivalents at the beginning of the year 288,651,701 160,110,887 115,660,921
Cash and cash equivalents at the end of the year 343,994,679 288,651,701 160,110,887
Supplemental disclosure of cash flow information:      
Interest paid, net of amounts capitalized 46,345,299 21,211,228 10,729,375
Income taxes paid 30,929,617 13,635,216 4,367,772
Supplemental schedule of non-cash activities:      
Amounts due from disposal of subsidiaries or affiliates included in prepaid expenses and other current assets 714,182   2,345,557
Property, plant and equipment cost included in other payables $ 36,495,522 $ 22,199,024 $ 18,943,086