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Risks and Financial Instruments - Allowance for doubtful accounts on trade receivables (Detail) - BRL (R$)
R$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Summary of risks and financial instruments [line items]    
Allowances for doubful accounts on trade receivable R$ 524,779 R$ 452,778
Ipiranga [member]    
Summary of risks and financial instruments [line items]    
Allowances for doubful accounts on trade receivable 442,486 350,594
Ultragaz [member]    
Summary of risks and financial instruments [line items]    
Allowances for doubful accounts on trade receivable 61,975 83,627
Oxiteno [member]    
Summary of risks and financial instruments [line items]    
Allowances for doubful accounts on trade receivable 12,371 10,755
Extrafarma [member]    
Summary of risks and financial instruments [line items]    
Allowances for doubful accounts on trade receivable 5,858 5,623
Ultracargo [member]    
Summary of risks and financial instruments [line items]    
Allowances for doubful accounts on trade receivable R$ 2,089 R$ 2,179