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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Summary of related parties [line items]      
Compensation expense of key executives R$ 54,180 R$ 41,094 R$ 50,307
Short-term compensation [member]      
Summary of related parties [line items]      
Compensation expense of key executives 41,659 36,504 45,477
Stock compensation [member]      
Summary of related parties [line items]      
Compensation expense of key executives 9,881 1,407 1,399
Post employment benefits [member]      
Summary of related parties [line items]      
Compensation expense of key executives 2,640 2,278 1,096
Long-term compensation [member]      
Summary of related parties [line items]      
Compensation expense of key executives 0   (6,459)
Termination benefit [member]      
Summary of related parties [line items]      
Compensation expense of key executives R$ 0 R$ 905 R$ 8,794