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INVESTMENTS IN ASSOCIATES (Details) - ARS ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
 [1]
Dec. 31, 2015
 [1]
Investments in associates [Abstract]        
Book value $ 72,670 $ 55,924 [1]    
Common stock 18,347,477 18,667,034 [1]    
Shareholders' equity $ 30,945,305 25,279,589 [1] $ 19,528,403 $ 18,649,007
Transporte y Servicios de Gas en Uruguay S.A.        
Investments in associates [Abstract]        
Face value (in pesos per share) $ 1      
Amount $ 196,000      
Cost 118      
Book value $ 5,798 3,981    
Main business Pipeline maintenance      
Date 9/30/2018      
Common stock $ 28      
Net (loss) / income for the year / period (689)      
Shareholders' equity $ 11,832      
% of Common Stock 49.00%      
Emprendimientos de Gas del Sur S.A. [Member]        
Investments in associates [Abstract]        
Face value (in pesos per share) $ 1      
Amount $ 116,130      
Cost 116      
Book value $ 324 543    
Main business Pipeline construction and operation services      
Date 9/30/2018      
Common stock $ 237      
Net (loss) / income for the year / period (70)      
Shareholders' equity $ 661      
% of Common Stock 49.00%      
Gas Link S.A.        
Investments in associates [Abstract]        
Face value (in pesos per share) $ 1      
Amount $ 502,962      
Cost 5,587      
Book value $ 66,548 $ 51,400    
Main business Pipeline construction and operation services      
Date 9/30/2018      
Common stock $ 1,026      
Net (loss) / income for the year / period 30,918      
Shareholders' equity $ 145,949      
% of Common Stock 49.00%      
[1] The Company has applied IFRS 15 and IFRS 9 for the first time on January 1, 2018. In accordance with the transition methods chosen, the comparative information has not been modified. See Note 4.a)