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Intangible Assets - Balances of goodwill (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Summary of intangible assets [line items]    
Goodwill R$ 931,808 R$ 1,525,088
Extrafarma [member]    
Summary of intangible assets [line items]    
Goodwill acquisition gross 661,553 661,553
Goodwill acquisition impairment R$ (593,280)  
Segment Extrafarma  
Goodwill R$ 68,273 661,553
Ipiranga [member]    
Summary of intangible assets [line items]    
Segment Ipiranga  
Goodwill R$ 276,724 276,724
Uniao Terminais [member]    
Summary of intangible assets [line items]    
Segment Ultracargo  
Goodwill R$ 211,089 211,089
Texaco [member]    
Summary of intangible assets [line items]    
Segment Ipiranga  
Goodwill R$ 177,759 177,759
Iconic (CBLSA)[member]    
Summary of intangible assets [line items]    
Segment Ipiranga  
Goodwill R$ 69,807 69,807
Oxiteno Uruguay [member]    
Summary of intangible assets [line items]    
Segment Oxiteno  
Goodwill R$ 44,856 44,856
Temmar [member]    
Summary of intangible assets [line items]    
Segment Ultracargo  
Goodwill R$ 43,781 43,781
DNP [member]    
Summary of intangible assets [line items]    
Segment Ipiranga  
Goodwill R$ 24,736 24,736
Repsol [member]    
Summary of intangible assets [line items]    
Segment Ultragaz  
Goodwill R$ 13,403 13,403
TEAS Terminal Exportador de Alcool de Santos Ltda. [member]    
Summary of intangible assets [line items]    
Segment Ultracargo  
Goodwill R$ 797 797
Others [member]    
Summary of intangible assets [line items]    
Segment Oxiteno  
Goodwill R$ 583 R$ 583