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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