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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES (Details 5) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Jun. 01, 2015
Jan. 01, 2015
Aug. 01, 2011
May. 31, 2009
Jun. 30, 2009
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
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           $ 1,921 $ 1,196 $ 1,083
Term of warranty obligation over which the assets is expected to be realized           25 years    
Insurance receivable           $ 56,605 43,402  
Downward adjustment of warranty cost           9,070    
Downward adjustment of other non-current assets           5,024    
Warranty costs (net effect of adjustment) included in cost of revenues           15,876 18,570 (16,465)
Foreign currency risk                
Cash and cash equivalents and restricted cash denominated in RMB, USD equivalent           $ 722,734 $ 574,531 $ 497,510
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 guarantees 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 guarantees for maintaining the performance levels 25 years              
Polycrystalline modules | Minimum                
Warranty cost                
Actual power output of module as a percentage of labeled power output           97.50%    
Monocrystalline modules                
Warranty cost                
Period for which the entity guarantees for maintaining the performance levels 25 years              
Monocrystalline modules | Minimum                
Warranty cost                
Actual power output of module as a percentage of labeled power output           97.00%    
Dymond Modules                
Warranty cost                
Term of warranty obligation over which the assets is expected to be realized   30 years            
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 | Standard solar modules | Minimum                
Warranty cost                
Actual power output of module as a percentage of labeled power output           97.00%    
Year 2 to year 24 of guaranteed performance period | Standard solar modules | Maximum                
Warranty cost                
Percentage of decline in actual annual power output of module           0.70%    
Year 2 to year 24 of guaranteed performance period | Polycrystalline modules | Maximum                
Warranty cost                
Percentage of decline in actual annual power output of module           0.70%    
Year 2 to year 24 of guaranteed performance period | Monocrystalline modules | Maximum                
Warranty cost                
Percentage of decline in actual annual power output of module           0.70%    
Year 25 of guaranteed performance period | Standard solar modules | Minimum                
Warranty cost                
Actual power output of module as a percentage of labeled power output           80.00%    
Year 25 of guaranteed performance period | Polycrystalline modules | Minimum                
Warranty cost                
Actual power output of module as a percentage of labeled power output           80.70%    
Year 25 of guaranteed performance period | Monocrystalline modules | Minimum                
Warranty cost                
Actual power output of module as a percentage of labeled power output           80.20%    
Year 2 to year 29 of guaranteed performance period | Dymond Modules | Maximum                
Warranty cost                
Percentage of decline in actual annual power output of module           0.50%    
Year 30 of guaranteed performance period | Dymond Modules | Minimum                
Warranty cost                
Actual power output of module as a percentage of labeled power output           83.00%