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Related Parties - Summary of Expenses for Compensation of Its Key Executives (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Summary of related parties [line items]      
Compensation expense of key executives R$ 55,588 R$ 54,180 R$ 41,094
Short-term compensation [member]      
Summary of related parties [line items]      
Compensation expense of key executives 47,936 41,659 36,504
Stock compensation [member]      
Summary of related parties [line items]      
Compensation expense of key executives 4,786 9,881 1,407
Post employment benefits [member]      
Summary of related parties [line items]      
Compensation expense of key executives R$ 2,866 R$ 2,640 2,278
Termination benefit [member]      
Summary of related parties [line items]      
Compensation expense of key executives     R$ 905