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EARNINGS PER SHARE (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Computation of basic and diluted gain (loss) per share      
Net income (loss) attributable to Canadian Solar Inc.-basic and diluted (in dollars) $ (195,468,691) $ (90,804,200) $ 50,568,919
Weighted average number of common shares-basic 43,190,778 43,076,489 42,839,356
Diluted share number from share options and restricted shares     838,852
Weighted average number of common shares-diluted 43,190,778 43,076,489 43,678,208
Basic earnings (loss) per share (in dollars per share) $ (4.53) $ (2.11) $ 1.18
Diluted earnings (loss) per share (in dollars per share) $ (4.53) $ (2.11) $ 1.16
Anti-dilutive shares excluded from the computation of diluted earnings (loss) per share      
Anti-dilutive shares excluded from the computation of diluted earnings (loss) per share, total 8,558,110 1,921,754 477,323
Convertible notes
      
Anti-dilutive shares excluded from the computation of diluted earnings (loss) per share      
Anti-dilutive shares excluded from the computation of diluted earnings (loss) per share, total   50,607 50,607
Share options ,restricted shares and restricted share units
      
Anti-dilutive shares excluded from the computation of diluted earnings (loss) per share      
Anti-dilutive shares excluded from the computation of diluted earnings (loss) per share, total 4,288,008 1,871,147 426,716
Warrant
      
Anti-dilutive shares excluded from the computation of diluted earnings (loss) per share      
Anti-dilutive shares excluded from the computation of diluted earnings (loss) per share, total 4,273,102