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Supplemental cash flow information (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Supplemental Cash Flow Information      
Total additions to contract assets (Note 14) R$ 5,240,528 R$ 4,759,789 R$ 3,948,158
Total additions to intangible assets (Note 15 (b)) 75,400 172,961 411,285
Items not affecting cash (see breakdown below) (1,765,391) (1,236,081) (1,095,786)
Total additions to intangible assets as per statement of cash flows 3,550,537 3,696,669 3,299,657
Interest capitalized in the year (Note 14 (a)) 622,803 300,792 238,330
Contractors payable 414,645 218,523 142,514
Program contract commitments 4,422
Performance agreements 576,392 478,177 314,720
Right of use 42,182 140,187 28,549
Construction margin (Note 26) 109,369 98,402 85,976
Agreement with the municipality of Mauá 280,774
Total R$ 1,765,391 R$ 1,236,081 R$ 1,095,786