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Trade Receivables and Reseller Financing - Breakdown of Expected Loss on Doubtful Accounts (Detail) - BRL (R$)
R$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Summary of trade receivables [line items]    
Trade receivables R$ 3,689,500 R$ 4,150,876
Expected losses on doubtful accounts [member]    
Summary of trade receivables [line items]    
Trade receivables 404,886 385,080
Current [member] | Expected losses on doubtful accounts [member]    
Summary of trade receivables [line items]    
Trade receivables 28,861 39,226
Less than 30 days [member] | Expected losses on doubtful accounts [member]    
Summary of trade receivables [line items]    
Trade receivables 1,456 4,094
From thirty 31 to 60 days [member] | Expected losses on doubtful accounts [member]    
Summary of trade receivables [line items]    
Trade receivables 1,625 3,754
From sixty one days to Ninety days [member] | Expected losses on doubtful accounts [member]    
Summary of trade receivables [line items]    
Trade receivables 3,749 5,533
From 91 to180 days [member] | Expected losses on doubtful accounts [member]    
Summary of trade receivables [line items]    
Trade receivables 23,698 46,783
More than 180 Days [member] | Expected losses on doubtful accounts [member]    
Summary of trade receivables [line items]    
Trade receivables R$ 345,497 R$ 285,690