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24. Benefit plans (Details 1) - ARS ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Benefit Plans Details 1Abstract      
Benefit payment obligations at beginning of year $ 524,140 $ 442,170  
Current service cost 32,904 42,500 $ 46,320
Interest cost 79,304 126,954 163,431
Actuarial losses 5,638 (22,219) (15,555)
Result from exposure to inflation (169,169) (8,692)  
Benefits paid to participating employees (55,354) (56,573)  
Benefit payment obligations at year end $ 417,463 $ 524,140 $ 442,170