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Principles of Consolidation, Investments in Subsidiaries, Acquisitions Under Approval and Business Combination - Consolidated information (Detail) - BRL (R$)
R$ / shares in Units, R$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Summary of principles of consolidation [line items]    
Net revenue from sales and services   R$ 80,007,676
Operating income   2,760,458
Net income for the year   R$ 1,507,074
Earnings per share basic - whole R$ (see Note 31)   R$ 1.3911
Earnings per share diluted - whole R$ (see Note 31)   R$ 1.3812
TEAS Terminal Exportador de Alcool de Santos Ltda. [member]    
Summary of principles of consolidation [line items]    
Net revenue from sales and services R$ 90,697,983  
Operating income 1,899,481  
Net income for the year R$ 1,132,468  
Earnings per share basic - whole R$ (see Note 31) R$ 1.0613  
Earnings per share diluted - whole R$ (see Note 31) R$ 1.0543