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Financial risk management (Details 2) (Detail) - BRL (R$)
R$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
At December    
Payables to third parties R$ 4,324,198 R$ 3,080,569
Trade payables 165,246 92,444
Other payables 29,501 19,462
Due within 30 days    
At December    
Payables to third parties 3,968,125 2,890,080
Trade payables 141,958 81,152
Due within 31 to 120 days    
At December    
Payables to third parties 233,694 133,070
Trade payables 18,744 6,032
Trade payables to related parties 28,869  
Due within 121 to 180 days    
At December    
Payables to third parties 66,967 31,081
Trade payables 1,358 1,740
Due within 181 to 360 days    
At December    
Payables to third parties 55,412 26,338
Trade payables 3,186 1,083
Trade payables to related parties   39,101
Other payables R$ 29,501 15,872
Due to 361 days or more days    
At December    
Trade payables   R$ 2,437