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Ultracargo - Fire Accident in Santos - Additional Information (Detail)
R$ in Thousands
 1 Months Ended 12 Months Ended
Jun. 30, 2017
cbm
Dec. 31, 2016
BRL (R$)
Dec. 31, 2014
Dec. 31, 2018
BRL (R$)
Dec. 31, 2017
BRL (R$)
Jan. 01, 2017
BRL (R$)
Disclosure of trade payables and receivables [line items]            
Percentage of overall capacity affected by fire     4.00%      
Total cubic meters licensing required for the return to operation | cbm 67,500          
Total cubic meters affected by the fire | cbm 150,000          
Indeminites to customers and third parties       R$ 3,501 R$ 72,216 R$ 99,863
Ultracargo fire accident in Santos [member]            
Disclosure of trade payables and receivables [line items]            
Insurance receivable   R$ 366,678        
Indeminites to customers and third parties   99,863        
Rescue, containment expense and loss of profit   78,878        
Other operating income, net   R$ 76,443