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Related Parties - Summary of Shares granted (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 1,224,524
Total grant costs, including taxes R$ 76,602
Accumulated recognized grant costs (61,393)
Accumulated unrecognized grant costs R$ 15,209
Sharebased payment arrangements 1 [member]  
Summary of related parties [line items]  
Grant date March 13, 2017
Balance of number of shares granted 200,000
Vesting period 2022 to 2024
Market price of shares on the grant date | R$ / shares R$ 34.00
Total grant costs, including taxes R$ 9,378
Accumulated recognized grant costs (4,513)
Accumulated unrecognized grant costs R$ 4,865
Sharebased payment arrangements 2 [member]  
Summary of related parties [line items]  
Grant date March 4, 2016
Balance of number of shares granted 380,000
Vesting period 2021 to 2023
Market price of shares on the grant date | R$ / shares R$ 32.72
Total grant costs, including taxes R$ 17,147
Accumulated recognized grant costs (11,164)
Accumulated unrecognized grant costs R$ 5,983
Sharebased payment arrangements 3 [member]  
Summary of related parties [line items]  
Grant date December 10, 2014
Balance of number of shares granted 533,324
Vesting period 2019 to 2021
Market price of shares on the grant date | R$ / shares R$ 25.32
Total grant costs, including taxes R$ 27,939
Accumulated recognized grant costs (23,967)
Accumulated unrecognized grant costs R$ 3,972
Sharebased payment arrangements 4 [member]  
Summary of related parties [line items]  
Grant date March 5, 2014
Balance of number of shares granted 111,200
Vesting period 2020 to 2021
Market price of shares on the grant date | R$ / shares R$ 26.08
Total grant costs, including taxes R$ 5,999
Accumulated recognized grant costs (5,610)
Accumulated unrecognized grant costs R$ 389
Sharebased payment arrangements 5 [member]  
Summary of related parties [line items]  
Grant date November 7, 2012
Vesting period 2019
Market price of shares on the grant date | R$ / shares R$ 21.45
Total grant costs, including taxes R$ 16,139
Accumulated recognized grant costs R$ (16,139)