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Earnings per share (Detail) - BRL (R$)
R$ / shares in Units, shares in Thousands, R$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Earnings per share [abstract]          
Profit attributable to owners of the Company R$ 148,378 R$ 60,625 R$ 478,781 R$ 127,186 R$ 35,084
Weighted average number of common shares 297,454,853 262,288,607 262,288,607 262,288,607 262,288,607
Basic earnings per share-R$ R$ 0.4988 R$ 0.2311      
Basic and diluted earnings per share - in reais     R$ 1.8254 R$ 0.4849 R$ 0.1338
Profit used to determine diluted earnings per share R$ 148,378 R$ 60,625 R$ 478,781 R$ 127,186 R$ 35,084
Weighted average number of outstanding common shares (thousands) 297,454,853 262,288,607 262,288,607 262,288,607 262,288,607
Number of shares under option 3,469,011        
Nmber of shares that would have been (2,339,734)        
Weighted average number of common shares for diluted earnings per share (thousands) 298,584,130 262,288,607      
Diluted earnings per share-R$ R$ 0.4969 R$ 0.2311