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Related Parties - Restricted Stock Program (Detail) - 12 months ended Dec. 31, 2020
R$ in Thousands
BRL (R$)
shares
$ / shares
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