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Commitments - Additional Information (Detail) m³ in Thousands, R$ in Thousands | Apr. 05, 2019 BRL (R$) | Apr. 05, 2019 m³ | Mar. 22, 2019 BRL (R$) m³ | Mar. 22, 2019 BRL (R$) m³ | Dec. 31, 2020 BRL (R$) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 BRL (R$)
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Disclosure of commitments and contingencies [line items] |  |  |  |  |  |  |
Investments | R$ |  |  |  |  | R$ 167,481 |  | R$ 181,619
Area port lease [member] | IPP [member] |  |  |  |  |  |  |
Disclosure of commitments and contingencies [line items] |  |  |  |  |  |  |
Percentage of consortium owned | 50.00% |  |  |  |  |  |
Investments | R$ |  |  | R$ 160 | R$ 160 |  |  |
Area port lease [member] | IPP [member] | Area BEL02A [member] |  |  |  |  |  |  |
Disclosure of commitments and contingencies [line items] |  |  |  |  |  |  |
Minimum port storage capacity |  | 41 |  |  |  |  |
Area port lease [member] | IPP [member] | Area BEL04A [member] |  |  |  |  |  |  |
Disclosure of commitments and contingencies [line items] |  |  |  |  |  |  |
Minimum port storage capacity |  | 23 |  |  |  |  |
Area port lease [member] | IPP [member] | Paraiba [member] | Port of Cabedelo [member] |  |  |  |  |  |  |
Disclosure of commitments and contingencies [line items] |  |  |  |  |  |  |
Minimum port storage capacity |  |  |  | 64 |  |  |
Area port lease [member] | IPP [member] | Espirito Santo [member] | Port of Vitoria [member] |  |  |  |  |  |  |
Disclosure of commitments and contingencies [line items] |  |  |  |  |  |  |
Minimum port storage capacity |  |  | 66 |  |  |  |
Area port lease [member] | Ultracargo [member] | Area VDC12 [member] |  |  |  |  |  |  |
Disclosure of commitments and contingencies [line items] |  |  |  |  |  |  |
Minimum port storage capacity |  | 59 |  |  |  |  |
Area port lease [member] | IPP and Ultracargo [member] |  |  |  |  |  |  |
Disclosure of commitments and contingencies [line items] |  |  |  |  |  |  |
Port concessions description |  |  | These concessions were carried out by two consortiums of which IPP holds one third of the total participation. |  |  |  |
Estimated investments to port concessions | R$ | R$ 450,000 |  |  |  |  |  |
Aratu [member] |  |  |  |  |  |  |
Disclosure of commitments and contingencies [line items] |  |  |  |  |  |  |
Cargo rates per ton | $ |  |  |  |  |  | 8.37 |
Suape [member] |  |  |  |  |  |  |
Disclosure of commitments and contingencies [line items] |  |  |  |  |  |  |
Cargo rates per ton | $ |  |  |  |  |  | 2.67 |
Itaqui [Member] |  |  |  |  |  |  |
Disclosure of commitments and contingencies [line items] |  |  |  |  |  |  |
Cargo rates per ton | $ |  |  |  |  |  | 0.78 |
Third parties [member] |  |  |  |  |  |  |
Disclosure of commitments and contingencies [line items] |  |  |  |  |  |  |
Liability insurance policies |  |  |  |  | 1,299 | $ 250,000 |
directors and executive officers (D&O) [member] |  |  |  |  |  |  |
Disclosure of commitments and contingencies [line items] |  |  |  |  |  |  |
Liability insurance policies |  |  |  |  | R$ 416 | $ 80,000 |

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