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Related Parties - Restricted Stock Program (Detail) R$ / shares in Units, R$ in Thousands | 12 Months Ended
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Dec. 31, 2018 BRL (R$) R$ / shares
Summary of related parties [line items] |
Balance of number of shares granted | 369,976
Total grant costs, including taxes | R$ 36,009
Accumulated recognized grant costs | (6,785)
Accumulated unrecognized grant costs | R$ 29,224
Restricted program [member] |
Summary of related parties [line items] |
Grant date | Oct. 01, 2017
Balance of number of shares granted | 120,000
Vesting period | 2023
Market price of shares on the grant date (in R$ per share) | R$ / shares | R$ 76.38
Total grant costs, including taxes | R$ 12,642
Accumulated recognized grant costs | (2,634)
Accumulated unrecognized grant costs | R$ 10,008
Restricted And Performance Program [member] |
Summary of related parties [line items] |
Grant date | Nov. 08, 2017
Balance of number of shares granted | 37,938
Vesting period | 2020 to 2022
Market price of shares on the grant date (in R$ per share) | R$ / shares | R$ 76.38
Total grant costs, including taxes | R$ 4,988
Accumulated recognized grant costs | (1,523)
Accumulated unrecognized grant costs | R$ 3,465
Restricted And Performance Program [member] |
Summary of related parties [line items] |
Grant date | Apr. 09, 2018
Balance of number of shares granted | 92,038
Vesting period | 2021 to 2023
Market price of shares on the grant date (in R$ per share) | R$ / shares | R$ 68.70
Total grant costs, including taxes | R$ 12,028
Accumulated recognized grant costs | (2,363)
Accumulated unrecognized grant costs | R$ 9,665
Restricted program [member] |
Summary of related parties [line items] |
Grant date | Sep. 19, 2018
Balance of number of shares granted | 80,000
Vesting period | 2024
Market price of shares on the grant date (in R$ per share) | R$ / shares | R$ 39.16
Total grant costs, including taxes | R$ 4,321
Accumulated recognized grant costs | (180)
Accumulated unrecognized grant costs | R$ 4,141
Restricted program three [member] |
Summary of related parties [line items] |
Grant date | Sep. 24, 2018
Balance of number of shares granted | 40,000
Vesting period | 2024
Market price of shares on the grant date (in R$ per share) | R$ / shares | R$ 36.80
Total grant costs, including taxes | R$ 2,030
Accumulated recognized grant costs | (85)
Accumulated unrecognized grant costs | R$ 1,945

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