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Equity - Additional Information (Detail) - BRL (R$) R$ / shares in Units, R$ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Feb. 24, 2021 | Aug. 12, 2020 | Feb. 19, 2020
Shareholders Equity [line items] |  |  |  |  |  |
Subscribed and paid-in capital stock | 1,115,005,712 | 1,112,810,192 |  |  |  |
Common shares authorized | 1,600,000,000 |  |  |  |  |
Price of the shares issued | R$ 23.74 | R$ 25.48 |  |  |  |
Common shares outstanding | 47,413,094 | 46,518,315 | 55,725,974 |  |  |
Shares held in treasury | 24,739,626 | 26,780,298 | 26,780,298 |  |  |
Average cost | R$ 19.77 | R$ 18.12 | R$ 18.12 |  |  |
Increase in capital reserves | R$ 498,812 |  |  |  | R$ 1,691 | R$ 53,072
Incurred costs directly attributable to issuing new shares | 2,260 |  |  |  |  |
Retention of profits and investments reserve | 3,658,265 | R$ 3,290,073 |  |  |  |
Dividends payable |  | R$ 261,470 |  |  |  |
Dividends per share |  | R$ 0.24 |  |  |  |
Rights Outstanding |  |  |  | 70,939 | 86,978 | 2,108,542
Proposed dividends payable | R$ 479,748 |  |  |  |  |
Proposed dividends payable per share | R$ 0.44 |  |  |  |  |

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