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Contract assets (Details Narrative) - BRL (R$) R$ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Contract Assets |  |  |
Interest inflation adjustments and exchange variations contract asset | R$ 564,302 | R$ 638,208 | R$ 622,803
Construction margin | 139,976 | 125,603 | R$ 109,369
Costs of expropriations recorded in contract asset | R$ 64,047 | R$ 58,682 |

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