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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Warranty cost (Details) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Aug. 01, 2016
Jan. 01, 2015
May 31, 2009
Jun. 30, 2015
Aug. 31, 2011
Jun. 30, 2009
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Warranty cost                  
Warranty accrual rate for sales of solar modules as a percentage of revenue             1.00%    
Term of insurance policy over which the insurance premium will be amortized             1 year    
Unamortized carrying amount of insurance premium             $ 2,531 $ 1,921  
Term of warranty obligation over which the assets is expected to be realized             25 years    
Insurance receivable             $ 61,879 56,605  
Downward adjustment of warranty cost             16,869    
Downward adjustment of other non-current assets             15,189    
Warranty costs (net effect of adjustment) included in cost of revenues             9,817 15,876 $ 18,570
Foreign currency risk                  
Cash and cash equivalents and restricted cash denominated in RMB, USD equivalent             $ 538,788 $ 722,734  
Maximum                  
Warranty cost                  
Guarantee of solar modules for defects in materials and engineering design, installation and construction             5 years    
Standard solar modules                  
Warranty cost                  
Guarantee of solar modules for defects in materials and engineering design, installation and construction     2 years            
Minimum percentage of decline in initial minimum power generation capacity for 10 years     10.00%            
Minimum percentage of decline in initial minimum power generation capacity for 25 years     20.00%            
Extended warranty of solar modules and products for defects in materials and workmanship         10 years 6 years      
Period for which the entity warrants for maintaining the performance levels         25 years        
Standard solar modules | Maximum                  
Warranty cost                  
Warranty period of solar modules and products against decline of more than 10% of initial power generation capacity     10 years            
Warranty period of solar modules and products against decline of more than 20% of initial power generation capacity     25 years            
Polycrystalline modules                  
Warranty cost                  
Period for which the entity warrants for maintaining the performance levels       25 years          
Monocrystalline modules                  
Warranty cost                  
Period for which the entity warrants for maintaining the performance levels       25 years          
Dymond Modules                  
Warranty cost                  
Term of warranty obligation over which the assets is expected to be realized   30 years              
Dymond polycrystalline modules                  
Warranty cost                  
Term of warranty obligation over which the assets is expected to be realized 30 years                
Dymond monocrystalline modules                  
Warranty cost                  
Period for which the entity warrants for maintaining the performance levels 30 years                
First year of guaranteed performance period | Standard solar modules | Minimum                  
Warranty cost                  
Actual power output of module as a percentage of labeled power output         97.00%        
First year of guaranteed performance period | Polycrystalline modules | Minimum                  
Warranty cost                  
Actual power output of module as a percentage of labeled power output             97.50%    
First year of guaranteed performance period | Monocrystalline modules | Minimum                  
Warranty cost                  
Actual power output of module as a percentage of labeled power output             97.00%    
First year of guaranteed performance period | Dymond Modules | Minimum                  
Warranty cost                  
Actual power output of module as a percentage of labeled power output               97.50%  
First year of guaranteed performance period | Dymond polycrystalline modules | Minimum                  
Warranty cost                  
Actual power output of module as a percentage of labeled power output             97.50%    
First year of guaranteed performance period | Dymond monocrystalline modules | Minimum                  
Warranty cost                  
Actual power output of module as a percentage of labeled power output             97.00%    
Second year to 24th year of guaranteed performance period | Standard solar modules | Maximum                  
Warranty cost                  
Percentage of decline in actual annual power output of module         0.70%        
Second year to 24th year of guaranteed performance period | Polycrystalline modules | Maximum                  
Warranty cost                  
Percentage of decline in actual annual power output of module             0.70%    
Second year to 24th year of guaranteed performance period | Monocrystalline modules | Maximum                  
Warranty cost                  
Percentage of decline in actual annual power output of module             0.70%    
25th year of guaranteed performance period | Standard solar modules | Minimum                  
Warranty cost                  
Actual power output of module as a percentage of labeled power output         80.00%        
25th year of guaranteed performance period | Polycrystalline modules | Minimum                  
Warranty cost                  
Actual power output of module as a percentage of labeled power output             80.70%    
25th year of guaranteed performance period | Monocrystalline modules | Minimum                  
Warranty cost                  
Actual power output of module as a percentage of labeled power output             80.20%    
Second year to 29th year of guaranteed performance period | Dymond Modules | Maximum                  
Warranty cost                  
Percentage of decline in actual annual power output of module               0.50%  
Second year to 29th year of guaranteed performance period | Dymond polycrystalline modules | Maximum                  
Warranty cost                  
Percentage of decline in actual annual power output of module             0.50%    
Second year to sixth year of guaranteed performance period | Dymond monocrystalline modules | Maximum                  
Warranty cost                  
Percentage of decline in actual annual power output of module             0.70%    
Seventh year to 29th year of guaranteed performance period | Dymond monocrystalline modules | Maximum                  
Warranty cost                  
Percentage of decline in actual annual power output of module             0.50%    
30th year of guaranteed performance period | Dymond Modules | Minimum                  
Warranty cost                  
Actual power output of module as a percentage of labeled power output               83.00%  
30th year of guaranteed performance period | Dymond polycrystalline modules | Minimum                  
Warranty cost                  
Actual power output of module as a percentage of labeled power output             83.00%    
30th year of guaranteed performance period | Dymond monocrystalline modules | Maximum                  
Warranty cost                  
Actual power output of module as a percentage of labeled power output             81.50%