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Segment Information - Additional Information (Detail) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 BRL (R$) Item | Dec. 31, 2020 BRL (R$) | Dec. 31, 2019 BRL (R$)
Disclosure of operating segments [line items] |  |  |
Revenue from Major Customer | R$ 25,865,001 | R$ 20,437,835 | R$ 20,611,409
Rumo S.A. [member] | Major Customers [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Number of largest customers | Item | 6 |  |
Revenue from Major Customer | R$ 2,916,247 | R$ 2,939,945 | R$ 773,286

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