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INTANGIBLE ASSETS AND GOODWILL - Main assumptions used in the annual test (Details)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Main assumptions used in the annual test    
Conservative growth rate 3.00%  
Argentina operation    
Main assumptions used in the annual test    
Discount rate 17.10% 20.50%
Chile operation    
Main assumptions used in the annual test    
Discount rate 7.20% 7.90%
Brazil operation    
Main assumptions used in the annual test    
Discount rate 9.60% 11.90%
Paraguay operation    
Main assumptions used in the annual test    
Discount rate 9.10% 10.70%
Minimum    
Main assumptions used in the annual test    
Perpetuity growth rate 2.00%  
Maximum    
Main assumptions used in the annual test    
Conservative growth rate 7.00%  
Perpetuity growth rate 2.50%