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Related Parties - Summary of Shares granted (Detail) - 12 months ended Dec. 31, 2020
R$ in Thousands
BRL (R$)
$ / shares
Summary of related parties [line items]    
Balance of number of shares granted 702,260  
Total grant costs, including taxes R$ 51,551  
Accumulated recognized grant costs (46,753)  
Accumulated unrecognized grant costs R$ 4,798  
Sharebased payment arrangements 1 [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 | $ / shares   $ 32.72
Total grant costs, including taxes R$ 17,147  
Accumulated recognized grant costs (14,076)  
Accumulated unrecognized grant costs R$ 3,071  
Sharebased payment arrangements 2 [member]    
Summary of related parties [line items]    
Grant date December 10, 2014  
Balance of number of shares granted 266,660  
Vesting period 2021  
Market price of shares on the grant date | $ / shares   25.32
Total grant costs, including taxes R$ 28,405  
Accumulated recognized grant costs (26,726)  
Accumulated unrecognized grant costs R$ 1,679  
Sharebased payment arrangements 3 [member]    
Summary of related parties [line items]    
Grant date March 5, 2014  
Balance of number of shares granted 55,600  
Vesting period 2021  
Market price of shares on the grant date | $ / shares   $ 26.08
Total grant costs, including taxes R$ 5,999  
Accumulated recognized grant costs (5,951)  
Accumulated unrecognized grant costs R$ 48