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Related Parties - Restricted Stock Program (Detail) - 12 months ended Dec. 31, 2020 R$ in Thousands | BRL (R$) shares | $ / shares
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Summary of related parties [line items] |  |
Balance of number of shares granted | shares | 2,910,162 |
Total grant costs, including taxes | R$ 101,291 |
Accumulated recognized grant costs | (32,400) |
Accumulated unrecognized grant costs | R$ 68,891 |
Restricted program [member] |  |
Summary of related parties [line items] |  |
Grant date | October 1, 2017 |
Balance of number of shares granted | shares | 240,000 |
Vesting period | 2023 |
Market price of shares on the grant date (in R$ per share) | $ / shares |  | $ 38.19
Total grant costs, including taxes | R$ 12,642 |
Accumulated recognized grant costs | (6,848) |
Accumulated unrecognized grant costs | R$ 5,794 |
Restricted And Performance Program [member] |  |
Summary of related parties [line items] |  |
Grant date | November 8, 2017 |
Balance of number of shares granted | shares | 23,674 |
Vesting period | 2021 to 2022 |
Market price of shares on the grant date (in R$ per share) | $ / shares |  | 38.19
Total grant costs, including taxes | R$ 2,723 |
Accumulated recognized grant costs | (1,852) |
Accumulated unrecognized grant costs | R$ 871 |
Restricted And Performance Program [member] |  |
Summary of related parties [line items] |  |
Grant date | April 4, 2018 |
Balance of number of shares granted | shares | 121,720 |
Vesting period | 2021 to 2023 |
Market price of shares on the grant date (in R$ per share) | $ / shares |  | 34.35
Total grant costs, including taxes | R$ 8,451 |
Accumulated recognized grant costs | (5,522) |
Accumulated unrecognized grant costs | R$ 2,929 |
Restricted program [member] |  |
Summary of related parties [line items] |  |
Grant date | September 19, 2018 |
Balance of number of shares granted | shares | 80,000 |
Vesting period | 2024 |
Market price of shares on the grant date (in R$ per share) | $ / shares |  | 19.58
Total grant costs, including taxes | R$ 3,691 |
Accumulated recognized grant costs | (810) |
Accumulated unrecognized grant costs | R$ 2,881 |
Restricted program [member] |  |
Summary of related parties [line items] |  |
Grant date | September 24, 2018 |
Balance of number of shares granted | shares | 80,000 |
Vesting period | 2024 |
Market price of shares on the grant date (in R$ per share) | $ / shares |  | 18.40
Total grant costs, including taxes | R$ 2,030 |
Accumulated recognized grant costs | (761) |
Accumulated unrecognized grant costs | R$ 1,269 |
Restricted And Performance Program [member] |  |
Summary of related parties [line items] |  |
Grant date | April 3, 2019 |
Balance of number of shares granted | shares | 469,872 |
Vesting period | 2022 to 2024 |
Market price of shares on the grant date (in R$ per share) | $ / shares |  | 23.25
Total grant costs, including taxes | R$ 20,900 |
Accumulated recognized grant costs | (9,573) |
Accumulated unrecognized grant costs | R$ 11,327 |
Restricted program [member] |  |
Summary of related parties [line items] |  |
Grant date | September 2, 2019 |
Balance of number of shares granted | shares | 440,000 |
Vesting period | 2025 |
Market price of shares on the grant date (in R$ per share) | $ / shares |  | 16.42
Total grant costs, including taxes | R$ 9,965 |
Accumulated recognized grant costs | (2,215) |
Accumulated unrecognized grant costs | R$ 7,750 |
Restricted And Performance Program [member] |  |
Summary of related parties [line items] |  |
Grant date | April 1, 2020 |
Balance of number of shares granted | shares | 754,896 |
Vesting period | 2023 to 2025 |
Market price of shares on the grant date (in R$ per share) | $ / shares |  | 12.53
Total grant costs, including taxes | R$ 18,653 |
Accumulated recognized grant costs | (3,584) |
Accumulated unrecognized grant costs | R$ 15,069 |
Restricted program [member] |  |
Summary of related parties [line items] |  |
Grant date | September 16, 2020 |
Balance of number of shares granted | shares | 700,000 |
Vesting period | 2026 |
Market price of shares on the grant date (in R$ per share) | $ / shares |  | $ 23.03
Total grant costs, including taxes | R$ 22,236 |
Accumulated recognized grant costs | (1,235) |
Accumulated unrecognized grant costs | R$ 21,001 |

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