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36. Related-party transactions (Details 1) - ARS ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of transactions between related parties [line items]      
Related-party expense $ (241,050) $ (290,051) $ (231,358)
PESA      
Disclosure of transactions between related parties [line items]      
Related-party expense (136,149) (132,393) (93,714)
SACME      
Disclosure of transactions between related parties [line items]      
Related-party expense (83,193) (125,627) (106,040)
Salaverri, Dellatorre, Burgio y Wetzler Malbran      
Disclosure of transactions between related parties [line items]      
Related-party expense 0 0 (1,347)
OSV      
Disclosure of transactions between related parties [line items]      
Related-party expense (19,646) (30,017) (29,162)
FIDUS      
Disclosure of transactions between related parties [line items]      
Related-party expense (777) 0 0
ABELOVICH, POLANO & ASSOC.      
Disclosure of transactions between related parties [line items]      
Related-party expense $ (1,285) $ (2,014) $ (1,095)