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Trade Receivables and Reseller Financing - Summary of Movements in the Allowance Losses on Doubtful Debts (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Reseller Financing - Ipiranga [member]    
Disclosure of financial assets [line items]    
Beginning balance R$ 139,699 R$ 104,977
Additions 30,601 34,722
Write-offs (14,294)  
Ending balance 156,006 139,699
Trade receivables [member]    
Disclosure of financial assets [line items]    
Beginning balance 385,080 347,801
Additions 189,192 287,566
Write-offs (169,386) (250,287)
Ending balance R$ 404,886 R$ 385,080