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Cash and cash equivalents (Details 1) (Detail) - BRL (R$)
R$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash and cash equivalents [abstract]        
Short-term bank deposits R$ 405,227 R$ 66,767    
Short-term investments 2,357,823      
Total R$ 2,763,050 R$ 66,767 R$ 79,969 R$ 6,888