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INCOME TAXES (Details 2)	12 Months Ended																						0 Months Ended	12 Months Ended
	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2012 Canada	Dec. 31, 2011 Canada	Dec. 31, 2010 Canada	Dec. 31, 2012 Canada Canadian Solar Solutions Inc.	Dec. 31, 2011 Canada Canadian Solar Solutions Inc.	Dec. 31, 2010 Canada Canadian Solar Solutions Inc.	Dec. 31, 2012 Canada Canadian Solar Manufacturing (Ontario) Inc.	Dec. 31, 2011 Canada Canadian Solar Manufacturing (Ontario) Inc.	Dec. 31, 2012 United States Canadian Solar (USA) Inc.	Dec. 31, 2011 United States Canadian Solar (USA) Inc.	Dec. 31, 2010 United States Canadian Solar (USA) Inc.	Dec. 31, 2012 Japan Canadian Solar Japan K.K.	Dec. 31, 2011 Japan Canadian Solar Japan K.K.	Dec. 31, 2010 Japan Canadian Solar Japan K.K.	Dec. 31, 2012 Germany Canadian Solar EMEA GmbH	Dec. 31, 2011 Germany Canadian Solar EMEA GmbH	Dec. 31, 2010 Germany Canadian Solar EMEA GmbH	Dec. 31, 2012 Hong Kong HKSI	Dec. 31, 2011 Hong Kong HKSI	Jan. 02, 2008 PRC	Dec. 31, 2012 PRC CNY	Dec. 31, 2012 PRC CSI Solartronics (Changshu) Co., Ltd.	Dec. 31, 2012 PRC CSI Solar Technologies Inc.	Dec. 31, 2011 PRC CSI Solar Technologies Inc.	Dec. 31, 2010 PRC CSI Solar Technologies Inc.	Dec. 31, 2014 PRC SZCC	Dec. 31, 2013 PRC SZCC	Dec. 31, 2012 PRC SZCC	Dec. 31, 2011 PRC SZCC	Dec. 31, 2010 PRC SZCC	Dec. 31, 2009 PRC SZCC	Dec. 31, 2012 PRC Canadian Solar Manufacturing (Luoyang) Inc.	Dec. 31, 2011 PRC Canadian Solar Manufacturing (Luoyang) Inc.	Dec. 31, 2010 PRC Canadian Solar Manufacturing (Luoyang) Inc.	Dec. 31, 2009 PRC Canadian Solar Manufacturing (Luoyang) Inc.	Dec. 31, 2012 PRC Canadian Solar Manufacturing (Changshu) Inc.	Dec. 31, 2011 PRC Canadian Solar Manufacturing (Changshu) Inc.	Dec. 31, 2010 PRC Canadian Solar Manufacturing (Changshu) Inc.	Dec. 31, 2012 PRC SZSP
Income Taxes
Federal and provincial income tax rate (as a percent)	27.00%	28.00%	31.00%	26.50%	28.25%	31.00%	26.50%	28.25%	31.00%	25.00%	26.50%
Income tax rate (as a percent)												35.55%	40.03%	39.83%	40.69%	40.69%	40.69%	33.00%	33.00%	33.00%	16.50%	16.50%		25.00%	25.00%	12.50%	12.50%	12.50%	15.00%	15.00%	15.00%	12.50%	12.50%	12.50%	25.00%	12.50%	12.50%	12.50%	25.00%	12.50%	12.50%	25.00%
Current Tax, net	$ 15,697,682	$ 21,126,626	$ 23,357,912
Amount of interest and penalties accrued related to unrecognized tax benefits	3,561,524	2,847,899
Period of statute of limitations																								3 years
Period of statute of limitations under special circumstances																								5 years
Threshold for underpayment of income tax liability that is listed as a special circumstance																								100,000
Period of statute of limitations for transfer pricing related adjustment																								10 years
Transition period of the new EIT Law																							5 years
Changes to the company's liabilities for uncertain tax positions
Beginning balance	9,453,041	9,191,281	8,953,568
Addition for tax positions related to the current year	1,789,167	736,707
Addition for tax positions from prior years			342,617
Reductions for tax positions from prior years/Statute of limitations expirations		(474,947)	(104,904)
Ending balance	$ 11,242,208	$ 9,453,041	$ 9,191,281

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The domestic federal statutory tax rate and provincial corporate income tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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The component of income tax expense for the period representing amounts of income taxes paid or payable (or refundable) for the period for all income tax obligations as determined by applying the provisions of relevant enacted tax laws to relevant amounts of taxable Income or Loss from continuing operations.

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