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INCOME TAXES (Details 2) | 12 Months Ended | 0 Months Ended | 12 Months Ended
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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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- Definition 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. + References No definition available. + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 289 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Current Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6509736 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I.7) -URI http://asc.fasb.org/extlink&oid=6889476&loc=d3e330036-122817 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 45 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section I -Subsection 7 + Details
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