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17. Share capital and additional paid-in capital (Details) - ARS ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
DisclosureOfShareCapitalAndAdditionalPaidinCapitalLineItems [Line Items]    
Beginning balance $ 18,427,504 $ 18,381,187
Payment of other reserve constitution - share-based compensation plan 10,700 46,317
Ending balance 18,438,204 18,427,504
Share Capital    
DisclosureOfShareCapitalAndAdditionalPaidinCapitalLineItems [Line Items]    
Beginning balance 18,197,583 18,197,583
Payment of other reserve constitution - share-based compensation plan 0 0
Ending balance 18,197,583 18,197,583
Additional Paid in Capital    
DisclosureOfShareCapitalAndAdditionalPaidinCapitalLineItems [Line Items]    
Beginning balance 229,921 183,604
Payment of other reserve constitution - share-based compensation plan 10,700 46,317
Ending balance $ 240,624 $ 229,921