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Income tax and social contribution (Details 2) (Detail) - BRL (R$)
R$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets and liabilities      
Assets R$ 63,822 R$ 37,015 R$ 8,305
Liabilities (63,226) (42,809) (24,378)
2017      
Deferred tax assets and liabilities      
Assets     940
Liabilities     (8,126)
2018      
Deferred tax assets and liabilities      
Assets 24,883 8,895 940
Liabilities (24,509) (20,728) (8,126)
2019      
Deferred tax assets and liabilities      
Assets 7,974 4,040 940
Liabilities (21,789) (18,008) (8,126)
2020      
Deferred tax assets and liabilities      
Assets 6,045 2,111 940
Liabilities (6,235) (2,454)  
2021      
Deferred tax assets and liabilities      
Assets 982 982 R$ 4,545
Liabilities (4,999) (1,434)  
2022      
Deferred tax assets and liabilities      
Assets 23,938 20,987  
Liabilities R$ (5,694) R$ (185)