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Risks and Financial Instruments - Changes in exchange rate (Detail)
R$ in Thousands, $ in Thousands
Dec. 31, 2020
BRL (R$)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
BRL (R$)
Dec. 31, 2019
USD ($)
Scenario I [member]        
Currency swaps receivable in U.S. dollars        
U.S. Dollar / Real swaps   $ 1,013,826   $ 700,499
Debts/firm commitments in dollars   (1,013,824)   (700,465)
Net effect   2   34
Currency swaps payable in U.S. dollars        
Real / U.S. Dollar swaps   59   376
Gross margin of Oxiteno/Ipiranga   (59)    
Gross margin of Oxiteno       (376)
Net effect    
Options        
Options Real / U.S. Dollar swaps      
Gross margin of Oxiteno      
Net effect      
Interest rate swap (in Brazilian Reais) - Debentures-CRA        
Fixed rate swap - DI | R$ R$ (39,412)   R$ (195,123)  
Fixed rate debt | R$ 39,412   195,123  
Net effect | R$    
Scenario II [member]        
Currency swaps receivable in U.S. dollars        
U.S. Dollar / Real swaps   1,522,343   1,668,202
Debts/firm commitments in dollars   (1,522,330)   (1,668,031)
Net effect   13   171
Currency swaps payable in U.S. dollars        
Real / U.S. Dollar swaps   17,877   62,559
Gross margin of Oxiteno/Ipiranga   (17,877)    
Gross margin of Oxiteno       (62,559)
Net effect    
Options        
Options Real / U.S. Dollar swaps       42,101
Gross margin of Oxiteno       (42,101)
Net effect      
Interest rate swap (in Brazilian Reais) - Debentures-CRA        
Fixed rate swap - DI | R$ (230,705)   (137,260)  
Fixed rate debt | R$ 230,705   137,260  
Net effect | R$    
Scenario III [member]        
Currency swaps receivable in U.S. dollars        
U.S. Dollar / Real swaps   2,030,860   2,635,905
Debts/firm commitments in dollars   (2,030,835)   (2,635,596)
Net effect   25   309
Currency swaps payable in U.S. dollars        
Real / U.S. Dollar swaps   35,694   124,742
Gross margin of Oxiteno/Ipiranga   (35,694)    
Gross margin of Oxiteno       (124,742)
Net effect    
Options        
Options Real / U.S. Dollar swaps       102,917
Gross margin of Oxiteno       $ (102,917)
Net effect | R$      
Interest rate swap (in Brazilian Reais) - Debentures-CRA        
Fixed rate swap - DI | R$ (187,597)   (74,027)  
Fixed rate debt | R$ 187,597   74,027  
Net effect | R$