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Expenses by nature (Details 1) (Parenthetical) (Detail) - BRL (R$)
R$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Compensation expenses related to the LTIP R$ 130,303 R$ 0    
Payroll taxes related to LTIP 80,270      
Early payments of receivables expense 18,834   R$ 27,956 R$ 4,495
IOF [Member]        
Tax on Financial Transactions 13,135 0    
Early payments of receivables expense R$ 1,465 R$ 16,382