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Trade Receivables and Reseller Financing - Breakdown of Estimated Loss on Doubtful Accounts (Detail) - BRL (R$)
R$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Summary of trade receivables [line items]    
Trade Receivables R$ (4,150,876) R$ (3,907,626)
Estimated losses on doubtful accounts [member]    
Summary of trade receivables [line items]    
Trade Receivables 385,080 347,801
Current [member] | Estimated losses on doubtful accounts [member]    
Summary of trade receivables [line items]    
Trade Receivables 39,226 27,104
Less than 30 days [member] | Estimated losses on doubtful accounts [member]    
Summary of trade receivables [line items]    
Trade Receivables 4,094 7,672
From thirty 31 to 60 days [member] | Estimated losses on doubtful accounts [member]    
Summary of trade receivables [line items]    
Trade Receivables 3,754 2,794
From sixty one days to Ninety days [member] | Estimated losses on doubtful accounts [member]    
Summary of trade receivables [line items]    
Trade Receivables 5,533 2,173
From 91 to180 days [member] | Estimated losses on doubtful accounts [member]    
Summary of trade receivables [line items]    
Trade Receivables 46,783 20,500
More than 180 Days [member] | Estimated losses on doubtful accounts [member]    
Summary of trade receivables [line items]    
Trade Receivables R$ 285,690 R$ 287,558