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Risks and Financial Instruments - Summary of allowance for doubtful accounts on trade receivables by geographic area (Detail) - BRL (R$)
R$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Statement [Line Items]    
Allowances for doubful accounts on trade receivable R$ 579,107 R$ 560,892
Brasil [member]    
Statement [Line Items]    
Allowances for doubful accounts on trade receivable 568,461 550,928
Mexico [member]    
Statement [Line Items]    
Allowances for doubful accounts on trade receivable 1,123
Uruguay [member]    
Statement [Line Items]    
Allowances for doubful accounts on trade receivable 76 267
Other Latin American countries [member]    
Statement [Line Items]    
Allowances for doubful accounts on trade receivable 271 561
United States of America and Canada [member]    
Statement [Line Items]    
Allowances for doubful accounts on trade receivable 1,146 889
Europe [member]    
Statement [Line Items]    
Allowances for doubful accounts on trade receivable 9,120 7,075
Others [member]    
Statement [Line Items]    
Allowances for doubful accounts on trade receivable R$ 33 R$ 49