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Related Parties - Restricted Stock Program (Detail)
R$ / shares in Units, R$ in Thousands
 12 Months Ended
Dec. 31, 2019
BRL (R$)
R$ / shares
Summary of related parties [line items]  
Balance of number of shares granted 1,738,660
Total grant costs, including taxes R$ 70,243
Accumulated recognized grant costs (19,742)
Accumulated unrecognized grant costs R$ 50,501
Restricted program [member]  
Summary of related parties [line items]  
Grant date Oct. 01, 2017
Balance of number of shares granted 240,000
Vesting period 2023
Market price of shares on the grant date (in R$ per share) | R$ / shares R$ 38.19
Total grant costs, including taxes R$ 12,642
Accumulated recognized grant costs (4,741)
Accumulated unrecognized grant costs R$ 7,901
Restricted And Performance Program [member]  
Summary of related parties [line items]  
Grant date Nov. 08, 2017
Balance of number of shares granted 75,876
Vesting period 2020 to 2022
Market price of shares on the grant date (in R$ per share) | R$ / shares R$ 38.19
Total grant costs, including taxes R$ 5,014
Accumulated recognized grant costs (2,850)
Accumulated unrecognized grant costs R$ 2,164
Restricted And Performance Program [member]  
Summary of related parties [line items]  
Grant date Apr. 04, 2018
Balance of number of shares granted 184,076
Vesting period 2021 to 2023
Market price of shares on the grant date (in R$ per share) | R$ / shares R$ 34.35
Total grant costs, including taxes R$ 12,066
Accumulated recognized grant costs (5,539)
Accumulated unrecognized grant costs R$ 6,527
Restricted program [member]  
Summary of related parties [line items]  
Grant date Sep. 19, 2018
Balance of number of shares granted 160,000
Vesting period 2024
Market price of shares on the grant date (in R$ per share) | R$ / shares R$ 19.58
Total grant costs, including taxes R$ 4,321
Accumulated recognized grant costs (900)
Accumulated unrecognized grant costs R$ 3,421
Restricted program [member]  
Summary of related parties [line items]  
Grant date Sep. 24, 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$ 18.40
Total grant costs, including taxes R$ 2,030
Accumulated recognized grant costs (423)
Accumulated unrecognized grant costs R$ 1,607
Restricted And Performance Program [member]  
Summary of related parties [line items]  
Grant date Apr. 03, 2019
Balance of number of shares granted 558,708
Vesting period 2022 to 2024
Market price of shares on the grant date (in R$ per share) | R$ / shares R$ 23.25
Total grant costs, including taxes R$ 24,096
Accumulated recognized grant costs (4,729)
Accumulated unrecognized grant costs R$ 19,367
Restricted program [member]  
Summary of related parties [line items]  
Grant date Sep. 02, 2019
Balance of number of shares granted 440,000
Vesting period 2025
Market price of shares on the grant date (in R$ per share) | R$ / shares R$ 16.42
Total grant costs, including taxes R$ 10,074
Accumulated recognized grant costs (560)
Accumulated unrecognized grant costs R$ 9,514