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Salaries and social charges (Detail) - BRL (R$)
R$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Salaries and social charges [Abstract]      
Profit sharing R$ 4,943 R$ 15,237 R$ 8,696
Salaries payable 2,962 2,758 1,682
Social charges 4,618 5,102 3,225
Payroll accruals 12,624 9,807 5,877
Other 1,045 1,365 789
Total R$ 26,192 R$ 34,269 R$ 20,269