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Trade Receivables and Reseller Financing - Breakdown of Estimated Losses on Doubtful Accounts (Detail) - BRL (R$)
R$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Summary of trade receivables [line items]    
Reseller financing R$ (715,530) R$ (570,259)
Estimated losses on doubtful accounts [member]    
Summary of trade receivables [line items]    
Reseller financing 139,699 104,977
Current [member] | Estimated losses on doubtful accounts [member]    
Summary of trade receivables [line items]    
Reseller financing 26,982 635
Less than 30 days [member] | Estimated losses on doubtful accounts [member]    
Summary of trade receivables [line items]    
Reseller financing 1,250 189
From thirty 31 to 60 days [member] | Estimated losses on doubtful accounts [member]    
Summary of trade receivables [line items]    
Reseller financing 1,642 86
From sixty one days to Ninety days [member] | Estimated losses on doubtful accounts [member]    
Summary of trade receivables [line items]    
Reseller financing 1,131 63
From 91 to180 days [member] | Estimated losses on doubtful accounts [member]    
Summary of trade receivables [line items]    
Reseller financing 12,176 1,951
More than 180 Days [member] | Estimated losses on doubtful accounts [member]    
Summary of trade receivables [line items]    
Reseller financing R$ 96,518 R$ 102,053