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Capital management (Details 1) (Detail) - BRL (R$)
R$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Capital management [abstract]            
Borrowings   R$ 0   R$ 205,204    
Cash and cash equivalents R$ (2,545,389) (66,767) R$ (14,744) (79,969) R$ (6,888) R$ (1,199)
Net debt       125,235    
Total equity R$ 4,476,722 R$ 870,391 R$ 687,486 626,862 R$ 461,877 R$ 426,563
Total capital       R$ 752,097    
Gearing ratio       16.65%