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Principles of Consolidation, Investments in Subsidiaries, Acquisitions Under Approval and Business Combination - Summary of goodwill (Detail) - BRL (R$)
R$ in Thousands
Dec. 31, 2018
Jan. 30, 2018
Dec. 31, 2017
Jan. 01, 2017
Nov. 17, 2016
Summary of principles of consolidation [line items]          
Consideration transferred         R$ 2,665,000
Non-controllinginterest R$ 351,924   R$ 377,824 R$ 30,855  
Acquisition date [member]          
Summary of principles of consolidation [line items]          
Consideration transferred     351,258    
Total assets acquired     (898,374)    
Total liabilities assumed     395,784    
Non-controllinginterest     221,139    
Goodwill     69,807    
TEAS Terminal Exportador de Alcool de Santos Ltda. [member]          
Summary of principles of consolidation [line items]          
Consideration transferred 103,373 R$ 103,373      
Total assets acquired (105,611)        
Total liabilities assumed 3,035        
Goodwill R$ 797 R$ 797      
Temporary amount [member] | Acquisition date [member]          
Summary of principles of consolidation [line items]          
Consideration transferred     356,077    
Total assets acquired     (765,673)    
Total liabilities assumed     350,666    
Non-controllinginterest     182,603    
Goodwill     123,673    
Adjustments [member] | Acquisition date [member]          
Summary of principles of consolidation [line items]          
Consideration transferred     4,819    
Total assets acquired     (132,701)    
Total liabilities assumed     45,118    
Non-controllinginterest     38,536    
Goodwill     R$ (53,866)