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Risks and Financial Instruments - Allowance for doubtful accounts on trade receivables (Detail) - BRL (R$)
R$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Summary of risks and financial instruments [line items]    
Allowances for doubful accounts on trade receivable R$ 560,892 R$ 524,779
Ipiranga [member]    
Summary of risks and financial instruments [line items]    
Allowances for doubful accounts on trade receivable 447,235 442,486
Ultragaz [member]    
Summary of risks and financial instruments [line items]    
Allowances for doubful accounts on trade receivable 94,985 61,975
Oxiteno [member]    
Summary of risks and financial instruments [line items]    
Allowances for doubful accounts on trade receivable 13,252 12,371
Extrafarma [member]    
Summary of risks and financial instruments [line items]    
Allowances for doubful accounts on trade receivable 3,419 5,858
Ultracargo [member]    
Summary of risks and financial instruments [line items]    
Allowances for doubful accounts on trade receivable R$ 2,001 R$ 2,089