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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, 2019
Dec. 31, 2018
Statement [Line Items]    
Allowances for doubful accounts on trade receivable R$ 560,892 R$ 524,779
Brasil [member]    
Statement [Line Items]    
Allowances for doubful accounts on trade receivable 550,928 513,136
Mexico [member]    
Statement [Line Items]    
Allowances for doubful accounts on trade receivable 1,123 621
Uruguay [member]    
Statement [Line Items]    
Allowances for doubful accounts on trade receivable 267 257
Outros países da América Latina [member]    
Statement [Line Items]    
Allowances for doubful accounts on trade receivable 561 1,750
Estados Unidos e Canadá [member]    
Statement [Line Items]    
Allowances for doubful accounts on trade receivable 889 1,394
Europa [member]    
Statement [Line Items]    
Allowances for doubful accounts on trade receivable 7,075 6,842
Outros [member]    
Statement [Line Items]    
Allowances for doubful accounts on trade receivable R$ 49 R$ 779