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BORROWINGS (Details 4) (USD $)
 12 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Credit facility
Dec. 31, 2012
Credit facility
Repayment due in 2013
Dec. 31, 2012
Local Chinese commercial banks
Loan agreement entered on October 29, 2011
Credit facility
Dec. 31, 2012
Local Chinese commercial banks
Loan agreement for the acquisition of the project 16
Credit facility
Dec. 31, 2012
Parent Company
Dec. 31, 2011
Parent Company
Dec. 31, 2010
Parent Company
Aug. 13, 2012
Parent Company
Local Chinese commercial banks
Loan agreement for the acquisition of the project 16
Credit facility
Dec. 31, 2012
Parent Company
Local Chinese commercial banks
Loan agreement for the acquisition of the project 16
Credit facility
Dec. 31, 2012
Parent Company
Local Chinese commercial banks
Loan agreement for the acquisition of the project 16
Credit facility
Repayment due in 2014
Dec. 31, 2012
Parent Company
Local Chinese commercial banks
Loan agreement for the acquisition of the project 16
Credit facility
Repayment due in 2015
Dec. 31, 2012
Parent Company
Local Chinese commercial banks
Loan agreement for the acquisition of the project 16
Credit facility
Repayment due in 2016
Dec. 31, 2012
Parent Company
Local Chinese commercial banks
Loan agreement for the acquisition of the project 16
Credit facility
Repayment due in 2017
Dec. 31, 2012
CSI Solar Power Inc.
Local Chinese commercial banks
Loan agreements for the construction of solar module production lines
Credit facility
Jun. 25, 2009
CSI Solar Power Inc.
Local Chinese commercial banks
Loan agreements for the construction of solar module production lines
Credit facility
Jun. 25, 2009
CSI Solar Power Inc.
Local Chinese commercial banks
Loan agreements for the construction of solar module production lines
Credit facility
Repayment due in 2011
Jun. 25, 2009
CSI Solar Power Inc.
Local Chinese commercial banks
Loan agreements for the construction of solar module production lines
Credit facility
Repayment due in 2012
Jun. 25, 2009
CSI Solar Power Inc.
Local Chinese commercial banks
Loan agreements for the construction of solar module production lines
Credit facility
Repayment due in 2013
Jun. 25, 2009
CSI Solar Power Inc.
Local Chinese commercial banks
Loan agreements for the construction of solar module production lines
Credit facility
Repayment due in 2014
May 31, 2010
CSI Cells Co., Ltd.
Local Chinese commercial banks
Loan agreement for the expansion of solar cell production capacity
Credit facility
item
Dec. 31, 2012
CSI Cells Co., Ltd.
Local Chinese commercial banks
Loan agreement for the expansion of solar cell production capacity
Credit facility
Dec. 31, 2012
CSI Cells Co., Ltd.
Local Chinese commercial banks
Loan agreement for the expansion of solar cell production capacity
Credit facility
Repayment due in 2013
Dec. 31, 2012
CSI Cells Co., Ltd.
Local Chinese commercial banks
Loan agreement for the expansion of solar cell production capacity
Credit facility
Repayment due in 2014
Dec. 31, 2012
CSI Cells Co., Ltd.
Local Chinese commercial banks
Loan agreement for the expansion of solar cell production capacity
Credit facility
Repayment due in 2015
May 31, 2010
CSI Cells Co., Ltd.
Local Chinese commercial banks
Loan agreement for the expansion of solar cell production capacity
First tranche
Dec. 31, 2012
CSI Cells Co., Ltd.
Local Chinese commercial banks
Loan agreement for the expansion of solar cell production capacity
First tranche
Dec. 31, 2012
CSI Cells Co., Ltd.
Local Chinese commercial banks
Loan agreement for the expansion of solar cell production capacity
Second tranche
May 31, 2010
CSI Cells Co., Ltd.
Local Chinese commercial banks
Loan agreement for the expansion of solar cell production capacity
Second tranche
Oct. 29, 2011
CSI Cells Co., Ltd.
Local Chinese commercial banks
Loan agreement entered on October 29, 2011
Credit facility
item
Dec. 31, 2012
CSI Cells Co., Ltd.
Local Chinese commercial banks
Loan agreement entered on October 29, 2011
Credit facility
Dec. 31, 2012
CSI Cells Co., Ltd.
Local Chinese commercial banks
Loan agreement entered on October 29, 2011
Credit facility
Repayment due in 2013
Dec. 31, 2012
CSI Cells Co., Ltd.
Local Chinese commercial banks
Loan agreement entered on October 29, 2011
Credit facility
Repayment due in 2014
Dec. 31, 2012
CSI Cells Co., Ltd.
Local Chinese commercial banks
Loan agreement entered on October 29, 2011
Credit facility
Repayment due in 2015
Dec. 31, 2012
CSI Cells Co., Ltd.
Local Chinese commercial banks
Loan agreement entered on October 29, 2011
Credit facility
Repayment due in 2016
Dec. 31, 2012
CSI Cells Co., Ltd.
Local Chinese commercial banks
Loan agreement entered on October 29, 2011
Credit facility
Repayment due in 2017
Oct. 29, 2011
CSI Cells Co., Ltd.
Local Chinese commercial banks
Loan agreement entered on October 29, 2011
First tranche
Dec. 31, 2012
CSI Cells Co., Ltd.
Local Chinese commercial banks
Loan agreement entered on October 29, 2011
First tranche
Dec. 31, 2012
CSI Cells Co., Ltd.
Local Chinese commercial banks
Loan agreement entered on October 29, 2011
Second tranche
Oct. 29, 2011
CSI Cells Co., Ltd.
Local Chinese commercial banks
Loan agreement entered on October 29, 2011
Second tranche
Dec. 31, 2012
Canadian Solar Manufacturing (Changshu) Inc.
Local Chinese commercial banks
Loan agreement entered on October 29, 2011
Credit facility
Dec. 31, 2012
Canadian Solar Manufacturing (Changshu) Inc.
Local Chinese commercial banks
Loan agreement for the expansion of solar module production lines
Credit facility
Nov. 11, 2010
Canadian Solar Manufacturing (Changshu) Inc.
Local Chinese commercial banks
Loan agreement for the expansion of solar module production lines
Credit facility
Nov. 11, 2010
Canadian Solar Manufacturing (Changshu) Inc.
Local Chinese commercial banks
Loan agreement for the expansion of solar module production lines
Credit facility
Repayment due in 2012
Nov. 11, 2010
Canadian Solar Manufacturing (Changshu) Inc.
Local Chinese commercial banks
Loan agreement for the expansion of solar module production lines
Credit facility
Repayment due in 2013
Nov. 11, 2010
Canadian Solar Manufacturing (Changshu) Inc.
Local Chinese commercial banks
Loan agreement for the expansion of solar module production lines
Credit facility
Repayment due in 2014
Jun. 26, 2012
Canadian Solar Japan K.K.
Japanese bank
Loan agreement for working capital
Credit facility
Dec. 31, 2012
Canadian Solar Japan K.K.
Japanese bank
Loan agreement for working capital
Credit facility
Repayment due in 2013
Dec. 31, 2012
Canadian Solar Japan K.K.
Japanese bank
Loan agreement for working capital
Credit facility
Repayment due in 2014
Dec. 31, 2012
Canadian Solar Japan K.K.
Japanese bank
Loan agreement for working capital
Credit facility
Repayment due in 2015
Long-term                                                                                                        
Maximum borrowing capacity       $ 1,388,843,703             $ 93,298,555             $ 14,318,670         $ 141,261,201         $ 69,333,970     $ 71,927,231 $ 130,458,720             $ 27,046,320     $ 103,412,400     $ 47,728,900       $ 1,921,478      
Repayment of credit facility                         14,012,841 9,808,989 21,019,262 25,223,113     4,772,880 4,772,880 3,181,927 1,590,960     34,667,091 53,233,522 16,935,768             13,523,188 6,118,823 6,118,823 15,359,128 43,996,408               15,909,603 15,909,603 15,909,604   776,142 776,142 369,194
Outstanding balance of credit facility         706,602,827             70,064,205         4,772,887             104,836,381         34,667,091 70,169,290     85,116,370             13,523,188 71,593,182     13,523,188                
Number of tranches                                             2                 2                                        
Repayment period of the first tranche of credit facility                                                       1 year                     1 year                          
Floating rate of borrowing (as a percent)                                                                                       95.00%                
Basis of interest rate                       LIBOR                                         Base interest rate published by People's Bank of China                     Base interest rate published by People's Bank of China                
Reference rate to compute the variable rate (as a percent)                       4.90%                                                                                
Maximum liabilities to assets ratio           90.00% 88.00%                                                   80.00%                   90.00%                  
Maturity term of credit facility                     60 months                                                                           36 months      
Fixed rate (as a percent)                                                                                                 0.90%      
Interest expense                                                                                                        
Interest capitalized - project assets 4,631,569                                                                                                      
Interest capitalized - property, plant, and equipment 670,374 4,099,815 1,686,262                                                                                                  
Interest expense 53,304,640 43,843,586 22,164,363         255,502 267,979 296,678                                                                                    
Total interest incurred $ 58,606,583 $ 47,943,401 $ 23,850,625