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Trade Receivables and Reseller Financing - Breakdown of Expected Loss on Doubtful Accounts (Detail) - BRL (R$)
R$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Summary of trade receivables [line items]    
Trade receivables R$ 3,391,122 R$ 3,689,500
Expected losses on doubtful accounts [member]    
Summary of trade receivables [line items]    
Trade receivables 382,096 404,886
Current [member] | Expected losses on doubtful accounts [member]    
Summary of trade receivables [line items]    
Trade receivables 21,219 28,861
Less than 30 days [member] | Expected losses on doubtful accounts [member]    
Summary of trade receivables [line items]    
Trade receivables 2,154 1,456
From thirty 31 to 60 days [member] | Expected losses on doubtful accounts [member]    
Summary of trade receivables [line items]    
Trade receivables 1,751 1,625
From sixty one days to Ninety days [member] | Expected losses on doubtful accounts [member]    
Summary of trade receivables [line items]    
Trade receivables 2,233 3,749
From 91 to180 days [member] | Expected losses on doubtful accounts [member]    
Summary of trade receivables [line items]    
Trade receivables 13,378 23,698
More than 180 Days [member] | Expected losses on doubtful accounts [member]    
Summary of trade receivables [line items]    
Trade receivables R$ 341,361 R$ 345,497