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Concessions payable- Summary of Concessions Payable (Detail) - BRL (R$)
R$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Disclosure of Concessions Payable And Judicial Deposits [line items]    
Concessions payable R$ 3,054,248 R$ 2,983,342
Current 160,771 158,705
Non-current 2,893,477 2,824,637
Court Discussion [member]    
Disclosure of Concessions Payable And Judicial Deposits [line items]    
Concessions payable 1,802,403 1,719,635
Court Discussion [member] | Rumo Malha Paulista S.A. [member]    
Disclosure of Concessions Payable And Judicial Deposits [line items]    
Concessions payable 55,170 101,871
Court Discussion [member] | Rumo Malha Oeste S.A. [member]    
Disclosure of Concessions Payable And Judicial Deposits [line items]    
Concessions payable 1,747,233 1,617,764
Railroad concession payable under litigation | Rumo Malha Paulista S.A. [member]    
Disclosure of Concessions Payable And Judicial Deposits [line items]    
Concessions payable 1,145,450 1,154,919
Payables    
Disclosure of Concessions Payable And Judicial Deposits [line items]    
Concessions payable 106,395 108,788
Payables | Rumo Malha Paulista S.A. [member]    
Disclosure of Concessions Payable And Judicial Deposits [line items]    
Concessions payable 20,682 24,151
Payables | Rumo Malha Sul S.A. [member]    
Disclosure of Concessions Payable And Judicial Deposits [line items]    
Concessions payable R$ 85,713 R$ 84,637