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Subsequent Events - Additional Information (Detail)
m³ in Thousands, R$ in Thousands
Apr. 10, 2019
BRL (R$)
Apr. 05, 2019
BRL (R$)
m³
Mar. 22, 2019
BRL (R$)
m³
Dec. 31, 2018
BRL (R$)
Dec. 31, 2017
BRL (R$)
Jan. 01, 2017
BRL (R$)
Disclosure of non-adjusting events after reporting period [line items]            
Investments | R$       R$ 129,087 R$ 150,194 R$ 141,687
Forward split [member]            
Disclosure of non-adjusting events after reporting period [line items]            
Description Stock split ratio At a ratio of one currently existing share to two shares of the same class and type.          
Port concessions [member] | IPP [member]            
Disclosure of non-adjusting events after reporting period [line items]            
Number of port concession areas won   2,000 3,000      
Number of consortiums     2,000      
Port concessions description     These concessions were carried out by two consortiums of which IPP holds one third of the total participation.      
Investments | R$     R$ 160,000      
Term of concession     25 years      
Percentage of consortium owned   50.00%        
Number of periods that Port areas will be operated   15 years        
Port concessions [member] | IPP [member] | Area BEL02A [member]            
Disclosure of non-adjusting events after reporting period [line items]            
Minimum port storage capacity   41        
Port concessions [member] | IPP [member] | Area BEL04A [member]            
Disclosure of non-adjusting events after reporting period [line items]            
Minimum port storage capacity   23        
Port concessions [member] | IPP [member] | Paraiba [member] | Port of Cabedelo [member]            
Disclosure of non-adjusting events after reporting period [line items]            
Minimum port storage capacity     64      
Port concessions [member] | IPP [member] | Espirito Santo [member] | Port of Vitoria [member]            
Disclosure of non-adjusting events after reporting period [line items]            
Minimum port storage capacity     66      
Port concessions [member] | Ultracargo [member]            
Disclosure of non-adjusting events after reporting period [line items]            
Number of port concession areas won   1,000        
Number of periods that Port areas will be operated   25 years        
Port concessions [member] | Ultracargo [member] | Area VDC12 [member]            
Disclosure of non-adjusting events after reporting period [line items]            
Minimum port storage capacity   59        
Port concessions [member] | IPP and Ultracargo [member]            
Disclosure of non-adjusting events after reporting period [line items]            
Estimated investments to port concessions | R$   R$ 450,000        
Administrative decision [member] | CADE [member]            
Disclosure of non-adjusting events after reporting period [line items]            
Payment for fine | R$ R$ 40,700