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35. Related-party transactions (Details 1) - ARS ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
SummaryOfRelatedpartyTransactionsLineItems [Line Items]      
Related-party expense $ (188,627) $ (150,457) $ (149,891)
PESA      
SummaryOfRelatedpartyTransactionsLineItems [Line Items]      
Related-party expense (86,098) (60,944) (67,642)
SACME      
SummaryOfRelatedpartyTransactionsLineItems [Line Items]      
Related-party expense (81,698) (68,960) (65,298)
Salaverri, Dellatorre, Burgio y Wetzler Malbran      
SummaryOfRelatedpartyTransactionsLineItems [Line Items]      
Related-party expense 0 (876) (6,365)
PYSSA      
SummaryOfRelatedpartyTransactionsLineItems [Line Items]      
Related-party expense 0 0 (39)
OSV      
SummaryOfRelatedpartyTransactionsLineItems [Line Items]      
Related-party expense (19,521) (18,965) (11,474)
ABELOVICH, POLANO & ASSOC.      
SummaryOfRelatedpartyTransactionsLineItems [Line Items]      
Related-party expense $ (1,310) $ (712) $ 0