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Income tax and social contribution (Details 1) (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Deferred tax      
Included in the statement of income R$ (126,331) R$ 10,280  
Deferred tax (132,125) (5,794) R$ (16,074)
Tax losses      
Deferred tax      
Included in the statement of income 1,424 436  
Deferred tax 2,911 1,487 1,051
Tax credit      
Deferred tax      
Included in the statement of income (712) (721)  
Deferred tax 2,173 2,885 3,606
Technological inovation      
Deferred tax      
Included in the statement of income [1] (41,987) (16,814)  
Deferred tax [1] (83,179) (41,192) (24,378)
Other temporary differences - ASSETS      
Deferred tax      
Included in the statement of income 32,073 28,995  
Deferred tax 64,715 32,642 R$ 3,648
Other Temporary Differences - LIABILITY      
Deferred tax      
Included in the statement of income (117,129) (1,616)  
Deferred tax R$ (118,745) R$ (1,616)  
[1] The main temporary differences representing the balance of the deferred tax liability refers to the benefit granted by the Technological Innovation Law (Lei do Bem).