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Risks and Financial Instruments - Allowance for doubtful accounts on trade receivables (Detail) - BRL (R$)
R$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Summary of risks and financial instruments [line items]    
Allowances for doubful accounts on trade receivable R$ 579,107 R$ 560,892
Ipiranga [member]    
Summary of risks and financial instruments [line items]    
Allowances for doubful accounts on trade receivable 447,389 447,235
Ultragaz [member]    
Summary of risks and financial instruments [line items]    
Allowances for doubful accounts on trade receivable 113,621 94,985
Oxiteno [member]    
Summary of risks and financial instruments [line items]    
Allowances for doubful accounts on trade receivable 16,430 13,252
Extrafarma [member]    
Summary of risks and financial instruments [line items]    
Allowances for doubful accounts on trade receivable 73 3,419
Ultracargo [member]    
Summary of risks and financial instruments [line items]    
Allowances for doubful accounts on trade receivable R$ 1,594 R$ 2,001