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Risks and Financial Instruments - summary of foreign exchange hedging instruments designated as fair value hedge (Detail)
R$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
BRL (R$)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
BRL (R$)
Dec. 31, 2019
USD ($)
Disclosure of detailed information about hedges [line items]        
Notional amount - R$ | $   $ 90,000   $ 90,000
Result of hedging instruments - gain/(loss) - R$ R$ 6,528   R$ 584  
Fair value adjustment of debt - R$ 3,250   (208)  
Financial expense in the statements of profit or loss - R$ R$ (8,968)   R$ (377)  
Average effective cost - DI % 99.90% 99.90% 99.90% 99.90%
Ipiranga [member]        
Disclosure of detailed information about hedges [line items]        
Notional amount - R$ | $   $ 65,523  
Result of hedging instruments - gain/(loss) - R$ R$ (87,448)    
Fair value adjustment of inventories – R$ 18,468    
Foreign exchange hedging instruments [member]        
Disclosure of detailed information about hedges [line items]        
Notional amount - R$ | $   $ 235,000   $ 395,000
Result of hedging instruments - gain/(loss) - R$ 574,378   79,466  
Fair value adjustment of debt - R$ (13,131)   (36,764)  
Financial expense in the statements of profit or loss - R$ R$ (597,735)   R$ (130,320)  
Average effective cost - DI % 104.10% 104.10% 104.40% 104.40%
Interest rate hedging instruments [member]        
Disclosure of detailed information about hedges [line items]        
Notional amount - R$ | $   $ 806,054   $ 806,054
Result of hedging instruments - gain/(loss) - R$ R$ 67,446   R$ 72,957  
Fair value adjustment of debt - R$ (18,446)   (76,992)  
Financial expense in the statements of profit or loss - R$ R$ (99,555)   R$ (68,054)  
Average effective cost - DI % 95.80% 95.80% 95.80% 95.80%