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35. Related-party transactions (Details) - ARS ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
SummaryOfRelatedpartyTransactionsLineItems [Line Items]      
Related-party income $ 44,303 $ 4,263 $ 18,608
CYCSA      
SummaryOfRelatedpartyTransactionsLineItems [Line Items]      
Related-party income 0 0 17,686
PESA      
SummaryOfRelatedpartyTransactionsLineItems [Line Items]      
Related-party income 149 0 0
PESA      
SummaryOfRelatedpartyTransactionsLineItems [Line Items]      
Related-party income 11,161 4,263 0
SACDE      
SummaryOfRelatedpartyTransactionsLineItems [Line Items]      
Related-party income 32,993 0 0
Transener      
SummaryOfRelatedpartyTransactionsLineItems [Line Items]      
Related-party income 0 0 369
Transba      
SummaryOfRelatedpartyTransactionsLineItems [Line Items]      
Related-party income $ 0 $ 0 $ 553