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26. Income tax (Details 1) - ARS ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
SummaryOfIncomeTaxLineItems [Line Items]      
Deferred tax asset $ 2,916,777 $ 2,425,764  
Deferred tax liability (10,965,085) (9,715,914)  
Net deferred tax assets (liabilities) (8,048,308) (7,290,150) $ (7,538,219)
To be recovered in less than 12 months      
SummaryOfIncomeTaxLineItems [Line Items]      
Deferred tax asset 2,310,153 669,450  
Deferred tax liability (1,966,173) (2,740,288)  
To be recovered in more than 12 months      
SummaryOfIncomeTaxLineItems [Line Items]      
Deferred tax asset 606,624 1,756,314  
Deferred tax liability $ (8,998,912) $ (6,975,626)