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RELATED PARTY BALANCES AND TRANSACTIONS (Details)
¥ in Thousands, ¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2018
JPY (¥)
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Dec. 31, 2018
CNY (¥)
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Dec. 31, 2018
USD ($)
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Dec. 31, 2017
JPY (¥)
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shares
Dec. 31, 2017
CNY (¥)
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Dec. 31, 2017
USD ($)
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Dec. 31, 2016
CNY (¥)
shares
Dec. 31, 2016
USD ($)
shares
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
RELATED PARTY BALANCES AND TRANSACTIONS                        
Amount due from related party                 $ 16,740 $ 26,102    
Amount due to related party                 16,847 6,023    
Revenue from sale of solar products     $ 119,825     $ 168,465   $ 247,743        
RSUs                        
RELATED PARTY BALANCES AND TRANSACTIONS                        
Granted (in shares) | shares 759,702 759,702 759,702 1,033,001 1,033,001 1,033,001 868,036 868,036        
Roserock                        
RELATED PARTY BALANCES AND TRANSACTIONS                        
Trade receivable from affiliate                 $ 13,844      
Membership interests owned (as a percent)   49.00%             49.00%      
Pilipinas Newton Energy Corp                        
RELATED PARTY BALANCES AND TRANSACTIONS                        
Cash funding from affiliate                 $ 1,872      
Membership interests owned (as a percent)   40.00%             40.00%      
Suzhou Financial Leasing Co., Ltd.                        
RELATED PARTY BALANCES AND TRANSACTIONS                        
Guarantee deposit for capital lease                 $ 940      
Membership interests owned (as a percent)   6.00%             6.00%      
Payable for capital lease                 $ 1,536      
ET Solutions South Africa 1 Pty                        
RELATED PARTY BALANCES AND TRANSACTIONS                        
Amount due from related party                 0      
Receivables from affiliate                 $ 84      
Membership interests owned (as a percent)   49.00%             49.00%      
Revenue from sale of solar products   ¥ 45,407 $ 6,859                  
Percentage of ownership after sale transaction 49.00% 49.00% 49.00%                  
Canadian Solar Infrastructure Fund, Inc                        
RELATED PARTY BALANCES AND TRANSACTIONS                        
Number of solar power plants sold | item 5 5 5 13 13 13            
Percent of units purchased 14.66% 14.66% 14.66% 14.66% 14.66% 14.66%            
Canadian Solar Infrastructure Fund, Inc | Asset management service                        
RELATED PARTY BALANCES AND TRANSACTIONS                        
Revenue from providing development services ¥ 247,341   $ 2,210 ¥ 303,772   $ 2,699            
Canadian Solar Infrastructure Fund, Inc | O & M Service                        
RELATED PARTY BALANCES AND TRANSACTIONS                        
Revenue from providing development services 122,529   1,105 32,119   285            
Canadian Solar Infrastructure Fund, Inc | Revenue                        
RELATED PARTY BALANCES AND TRANSACTIONS                        
Revenue from sale of solar products 12,276,404   109,597 18,426,754   163,155            
Canadian Solar Infrastructure Fund, Inc | Other operating income or expense                        
RELATED PARTY BALANCES AND TRANSACTIONS                        
Revenue from sale of solar products ¥ 89,238   $ 836 ¥ 3,148,648   $ 27,879            
Suzhou iSilver Materials Co                        
RELATED PARTY BALANCES AND TRANSACTIONS                        
Membership interests owned (as a percent)   15.00%             15.00%      
Trade payable to affiliate                 $ 11,753      
Percent of units purchased 14.63% 14.63% 14.63% 14.63% 14.63% 14.63% 14.63% 14.63%        
Revenue from sale of solar products               $ 8,030        
Purchase from related party   ¥ 512,154 $ 74,490   ¥ 331,958 $ 49,113 ¥ 53,271 $ 8,030        
Suzhou Kzone Equipment Technology Co., Ltd                        
RELATED PARTY BALANCES AND TRANSACTIONS                        
Membership interests owned (as a percent)                     32.00%  
Payable for equipment purchase                     $ 4,053,000  
Percent of units purchased 32.00% 32.00% 32.00% 32.00% 32.00% 32.00%            
Purchase from related party   ¥ 41,635 $ 6,056   ¥ 29,704 $ 4,395            
Dr. Shawn Qu                        
RELATED PARTY BALANCES AND TRANSACTIONS                        
Government award     $ 73                  
Dr. Shawn Qu | RSUs                        
RELATED PARTY BALANCES AND TRANSACTIONS                        
Granted (in shares) | shares 83,805 83,805 83,805 77,289 77,289 77,289 121,951 121,951        
Dr. Shawn Qu | One-year loan facilities | Chinese Commercial Banks                        
RELATED PARTY BALANCES AND TRANSACTIONS                        
Maturity term of credit facility 1 year 1 year 1 year 1 year 1 year 1 year 1 year 1 year        
Maximum borrowing capacity   ¥ 730,000     ¥ 1,346,000   ¥ 896,000   106,000 206,000   $ 129,000
Amounts drawn down                 65,244 $ 135,225   79,558
Dr. Shawn Qu | Two-year loan facilities | Chinese Commercial Banks                        
RELATED PARTY BALANCES AND TRANSACTIONS                        
Maturity term of credit facility             2 years 2 years        
Maximum borrowing capacity   ¥ 540,000                   $ 79,000
Amounts drawn down                 $ 20,731      
Gaochuangte                        
RELATED PARTY BALANCES AND TRANSACTIONS                        
Revenue from sale of solar products         ¥ 11,352 $ 1,648            
Percentage of ownership after sale transaction       80.00% 80.00% 80.00%            
Purchase cost incurred from related party         ¥ 44,271 $ 6,430 ¥ 54,891 $ 8,274        
Roserock and Garland                        
RELATED PARTY BALANCES AND TRANSACTIONS                        
Revenue from sale of solar products               247,743        
Tranquility, Garland, and Roserock                        
RELATED PARTY BALANCES AND TRANSACTIONS                        
Revenue from sale of solar products               $ 48,711