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Employee benefits - Changes in Actuarial Liabilities (Details) - Defined benefit plan - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Employee benefits    
Actuarial liabilities balance, beginning of the year R$ 351,263 R$ 339,009
Interest on actuarial liability 35,920 38,022
Actuarial (gain) loss 69,305 (4,173)
Benefits paid in the year (26,061) (21,595)
Actuarial liabilities balance, end of the year R$ 430,427 R$ 351,263