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Subsequent Events - Additional Information (Detail) m³ in Thousands, R$ in Thousands | Apr. 09, 2021 BRL (R$) m³ | Mar. 26, 2021 BRL (R$) | Mar. 19, 2021 BRL (R$) | Feb. 24, 2021 shares | Dec. 31, 2020 BRL (R$) shares | Aug. 12, 2020 shares | Feb. 19, 2020 shares
--- | --- | --- | --- | --- | --- | --- | ---
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |
Rights outstanding | shares |  |  |  | 70,939 |  | 86,978 | 2,108,542
Debentures |  |  |  |  | R$ 6,544,116 |  |
Major ordinary share transactions [member] |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |
Number of shares issued | shares |  |  |  |  |  |  | 1,115,076,651
Rights outstanding | shares |  |  |  | 70,939 | 2,195,520 |  |
Issuance of debentures [member] | Tequimar Vila do Conde [member] | Debentures, nonconvertible into shares, maturing on March 15, 2028 [member] | Debentures first issue [member] |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |
Debentures |  |  | R$ 360,000 |  |  |  |
Final maturity |  |  | March 15, 2028 |  |  |  |
Floating interest rates in dollar change in foreign loan |  |  | IPCA plus 4.04% |  |  |  |
Borrowings, interest rate basis |  |  | 111.4% of DI |  |  |  |
Issuance of debentures [member] | Tequimar Vila do Conde [member] | Debentures, nonconvertible into shares, maturing on March 15, 2028 [member] | Debentures second issue [member] |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |
Debentures |  | R$ 100,000 |  |  |  |  |
Final maturity |  | March 15, 2028 |  |  |  |  |
Floating interest rates in dollar change in foreign loan |  | IPCA plus 4.37% |  |  |  |  |
Borrowings, interest rate basis |  | 111.4% of DI |  |  |  |  |
Port concessions [ember] | Ultracargo [member] |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |
Estimated investments | R$ 310,000 |  |  |  |  |  |
Estimated investments, disbursement period | 6 years |  |  |  |  |  |
Port concessions [ember] | Ultracargo [member] | Bottom of range [member] |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |
Minimum port storage capacity | m³ | 79 |  |  |  |  |  |
Term of concession | 20 years |  |  |  |  |  |

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