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Related Parties - Summarized Changes of Number of Restricted and Performance Shares Granted (Detail)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
shares
BRL (R$)
Dec. 31, 2019
BRL (R$)
shares
Summary of related parties [line items]    
Beginning Balance 1,738,660 739,952
Shares granted | shares 2,910,162  
Cancellation of granted shares due to termination of executive employment | shares (353,294) (9,168)
Cancellation of performance shares | shares (52,992)  
Ending Balance 2,910,162 1,738,660
April 3, 2019 [member]    
Summary of related parties [line items]    
Shares granted   567,876
September 2, 2019 [member]    
Summary of related parties [line items]    
Shares granted   440,000
April 1, 2020 [member]    
Summary of related parties [line items]    
Shares granted 877,788  
September 16, 2020 [member]    
Summary of related parties [line items]    
Shares granted 700,000