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29. Provisions (Details) - ARS ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
SummaryOfProvisionsLineItems [Line Items]    
Provisions, beginning $ 883,119  
Provisions, ending 1,070,150 $ 883,119
Non-current liabilities    
SummaryOfProvisionsLineItems [Line Items]    
Provisions, beginning 883,119 504,038
Increases 472,067 411,975
Decreases (85,662) (4)
Result from exposure to inflation (199,374) (32,890)
Provisions, ending 1,070,150 883,119
Current liabilities    
SummaryOfProvisionsLineItems [Line Items]    
Provisions, beginning 190,858 129,808
Increases 252,030 130,389
Decreases (239,585) (58,930)
Result from exposure to inflation (15,868) (10,409)
Provisions, ending $ 187,435 $ 190,858