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RELATED PARTY BALANCES AND TRANSACTIONS (Details)
¥ in Thousands, ¥ in Thousands, $ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 01, 2018
Mar. 31, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2017
JPY (¥)
item
Dec. 31, 2017
CNY (¥)
item
Dec. 31, 2017
USD ($)
item
Dec. 31, 2016
CNY (¥)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
CNY (¥)
Dec. 31, 2015
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
RELATED PARTY BALANCES AND TRANSACTIONS                            
Amount due from related party                     $ 26,102   $ 19,082  
Amount due to related party                     6,023   19,912  
Revenue from sale of solar products           $ 168,465   $ 247,743   $ 104,352        
Canadian Solar Infrastructure Fund, Inc                            
RELATED PARTY BALANCES AND TRANSACTIONS                            
Number of solar power plants sold | item       13 13 13                
Percent of units purchased 14.76%                          
Canadian Solar Infrastructure Fund, Inc | Asset management service                            
RELATED PARTY BALANCES AND TRANSACTIONS                            
Revenue from providing development services       ¥ 303,772   $ 2,699                
Canadian Solar Infrastructure Fund, Inc | O & M Service                            
RELATED PARTY BALANCES AND TRANSACTIONS                            
Revenue from providing development services       32,119   285                
Canadian Solar Infrastructure Fund, Inc | Revenue                            
RELATED PARTY BALANCES AND TRANSACTIONS                            
Revenue from sale of solar products       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       ¥ 3,148,648   27,879                
Gaochuangte                            
RELATED PARTY BALANCES AND TRANSACTIONS                            
Trade receivable from affiliate                         $ 1,446  
Membership interests owned (as a percent)             40.00%           40.00%  
Trade payable to affiliate                         $ 19,912  
Revenue from sale of solar products         ¥ 11,352 1,648     ¥ 39,922 6,508        
Purchase from related party         ¥ 44,271 $ 6,430 ¥ 54,891 8,274 ¥ 175,272 28,159        
Percentage of ownership after sale transaction       80.00% 80.00% 80.00%                
CSI Skypower                            
RELATED PARTY BALANCES AND TRANSACTIONS                            
Membership interests owned (as a percent)             50.00%           50.00%  
Prepayments for bidding to affiliate                         $ 1,897  
Tranquility, Garland, and Roserock (49% owned affiliates)                            
RELATED PARTY BALANCES AND TRANSACTIONS                            
Amount due from related party                     0   0  
Trade receivable from affiliate                         $ 15,739  
Membership interests owned (as a percent)             49.00%           49.00%  
Revenue from providing development services               48,711   $ 69,712        
Pilipinas Newton Energy Corp (40% owned affiliate)                            
RELATED PARTY BALANCES AND TRANSACTIONS                            
Cash funding from affiliate                     $ 921      
Membership interests owned (as a percent)         40.00%           40.00%      
O & M Service                            
RELATED PARTY BALANCES AND TRANSACTIONS                            
Receivables from affiliate                     $ 199      
Membership interests owned (as a percent)         14.76%           14.76%      
Suzhou iSilver Materials Co                            
RELATED PARTY BALANCES AND TRANSACTIONS                            
Membership interests owned (as a percent)         15.00%           15.00%      
Trade payable to affiliate                     $ 5,096      
Purchase from related party         ¥ 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                       $ 927    
Purchase from related party         ¥ 29,704 $ 4,395                
Dr. Shawn Qu                            
RELATED PARTY BALANCES AND TRANSACTIONS                            
Loan from related party     $ 35,000                      
Rate of interest (as a percent)   4.25% 4.25%                      
Repayment of interest amount of loan from related party   $ 21                        
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        
Maximum borrowing capacity         ¥ 1,346,000   ¥ 896,000   ¥ 896,000   206,000      
Amounts drawn down                     135,225   $ 79,558 $ 78,225
Dr. Shawn Qu | Three-year loan facilities | Chinese Commercial Banks                            
RELATED PARTY BALANCES AND TRANSACTIONS                            
Maturity term of credit facility                 3 years 3 years        
Maximum borrowing capacity                           $ 150,000
Tranquillity | Recurrent                            
RELATED PARTY BALANCES AND TRANSACTIONS                            
Unconditionally buyer payment guarantees for payable balances due by related party                     0   0  
Roserock                            
RELATED PARTY BALANCES AND TRANSACTIONS                            
Trade receivable from affiliate                     $ 13,930      
Membership interests owned (as a percent)         49.00%           49.00%      
Garland                            
RELATED PARTY BALANCES AND TRANSACTIONS                            
Cash funding from affiliate                     $ 11,052      
Membership interests owned (as a percent)         49.00%           49.00%      
Garland | Recurrent                            
RELATED PARTY BALANCES AND TRANSACTIONS                            
Unconditionally buyer payment guarantees for payable balances due by related party                     $ 0   $ 11,100  
Roserock and Garland                            
RELATED PARTY BALANCES AND TRANSACTIONS                            
Revenue from sale of solar products               $ 247,743   $ 28,132