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Income tax and social contribution (Details 2) (Detail) - BRL (R$)
R$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets and liabilities    
Assets   R$ 37,015
Liabilities R$ (132,125) (42,809)
2018    
Deferred tax assets and liabilities    
Assets   8,895
Liabilities (8,508) (20,728)
2019    
Deferred tax assets and liabilities    
Assets   4,040
Liabilities (13,659) (18,008)
2020    
Deferred tax assets and liabilities    
Assets   2,111
Liabilities (15,420) (2,454)
2021    
Deferred tax assets and liabilities    
Assets   982
Liabilities 10,556 (1,434)
2022    
Deferred tax assets and liabilities    
Assets   20,987
Liabilities R$ (105,094) R$ (185)