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Trade Payables - Summary of Trade Payables (Detail) - BRL (R$)
R$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2017
Summary of trade payables [line items]      
Trade payables R$ 2,551,607 R$ 2,155,498 R$ 1,709,563
Domestic suppliers [member]      
Summary of trade payables [line items]      
Trade payables 2,079,010 1,973,668  
Domestic suppliers agreement [member]      
Summary of trade payables [line items]      
Trade payables 73,169    
Foreign suppliers [member]      
Summary of trade payables [line items]      
Trade payables 472,597 R$ 181,830  
Foreign suppliers agreement [member]      
Summary of trade payables [line items]      
Trade payables R$ 106,901