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18. Employee Benefits and Private Pension Plan (Details 4)
R$ in Thousands
 12 Months Ended
Dec. 31, 2017
BRL (R$)
Discount rate  
SummaryOfEmployeeBenefitsLineItems [Line Items]  
Changes in assumption, decrease in liability increase by 1.0 p.p
Decrease in liability R$ 10,237
Change in assumptions, increase in liability decrease by 1.0 p.p
Increase in liability R$ 11,690
Wage growth rate  
SummaryOfEmployeeBenefitsLineItems [Line Items]  
Changes in assumption, decrease in liability decrease by 1.0 p.p
Decrease in liability R$ 2,807
Change in assumptions, increase in liability increase by 1.0 p.p
Increase in liability R$ 3,103
Medical services wage growth rate  
SummaryOfEmployeeBenefitsLineItems [Line Items]  
Changes in assumption, decrease in liability decrease by 1.0 p.p
Decrease in liability R$ 3,837
Change in assumptions, increase in liability increase by 1.0 p.p
Increase in liability R$ 4,413