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9. Income and Social Contribution Taxes (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income And Social Contribution Taxes Details 1      
Initial balance R$ 409,699 R$ 292,989 R$ 309,726
Deferred IRPJ and CSLL recognized in income of the year 83,029 100,505 (14,813)
Deferred IRPJ and CSLL recognized in other comprehensive income 13,389 18,938 (2,250)
Deferred IRPJ and CSLL recognized in business combination (610) 0 0
Others 1,580 (2,733) 326
Final balance R$ 507,087 R$ 409,699 R$ 292,989