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Financial Assets and Liabilities - Additional information (Detail) R$ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Oct. 06, 2021 | Dec. 31, 2021 BRL (R$) Item | Dec. 31, 2020 BRL (R$)
Disclosure of Financial Resources [line items] |  |  |
Number of criteria for classification of financial instruments | Item |  | 2 |
Penalties for early redemption of repurchase agreements |  | R$ 0 |
Explanation of details of guarantees given or received of outstanding balances for related party transaction |  | There were no guarantees given or received on any accounts receivable or payable involving related parties. |
Banco Itaú and Banco Bradesco |  |  |
Disclosure of Financial Resources [line items] |  |  |
Average rate |  | 10.60% | 3.00%
Average payment term to suppliers |  | 90 days |
Top of range [member] |  |  |
Disclosure of Financial Resources [line items] |  |  |
Maturity period of short-term investments classified as cash and cash equivalents |  | 3 months |
Period of fixed term of repurchase agreements |  | 90 days |
Maturity period of bank deposit certificates classified as cash and cash equivalents |  | 90 days |
Maturity period of government bonds, marketable securities and restricted cash |  | 5 years |
ESG Funds |  |  |
Disclosure of Financial Resources [line items] |  |  |
Investment maturity term | 5 years |  |
SELIC [member] | Government security [member] |  |  |
Disclosure of Financial Resources [line items] |  |  |
Interest, Index |  | 100% of the CDI |
Bank investments [member] | Other [Member] |  |  |
Disclosure of Financial Resources [line items] |  |  |
Weighted remuneration (in bps) |  | 49 |
Weighted remuneration (as a percent) |  | 0.47% |
Inter Bank Deposit Certificate [member] |  |  |
Disclosure of Financial Resources [line items] |  |  |
Onshore financial investments remunerated rate |  | 100.00% | 97.00%
Fed Funds [member] |  |  |
Disclosure of Financial Resources [line items] |  |  |
Offshore financial investments remunerated rate |  | 100.00% |
Rumo S A [member] |  |  |
Disclosure of Financial Resources [line items] |  |  |
Advance by suppliers with financial institutions |  | R$ 576,786 | R$ 413,470
Rumo S A [member] | BNDES [member] |  |  |
Disclosure of Financial Resources [line items] |  |  |
Unused line of credit |  | 898,023 | 487,378
Comgas [member] | BNDES [member] |  |  |
Disclosure of Financial Resources [line items] |  |  |
Unused line of credit |  | 2,500,000 |
Cosan S.A. [member] | Three Brazilian Financial Institutions [member] |  |  |
Disclosure of Financial Resources [line items] |  |  |
Unused line of credit |  | R$ 250,000 | R$ 250,000

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