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Loans, financing, debentures and hedge derivative financial instruments - Additional Information (Detail)
$ in Thousands
 12 Months Ended
Jul. 13, 2020
BRL (R$)
Jun. 21, 2019
BRL (R$)
Jun. 06, 2019
BRL (R$)
Oct. 06, 2016
BRL (R$)
Dec. 31, 2020
BRL (R$)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
BRL (R$)
Dec. 31, 2018
BRL (R$)
Dec. 31, 2020
USD ($)
Jul. 13, 2020
USD ($)
Jun. 21, 2019
USD ($)
Jun. 06, 2019
USD ($)
Oct. 06, 2016
USD ($)
Summary of loans debentures and finance leases [line items]                          
Foreign currency - denominated loans         R$ 9,188,527,000   R$ 6,902,121,000            
Financing guaranteed by collateral         75,251,000   73,536,000            
Amount of guarantees and promissory notes         13,758,033,000   11,833,294,000            
Collateral guarantees to secure letters of credits         129,139,000   293,509,000            
Loans paid off in advance         2,795,002,000   R$ 2,644,704,000 R$ 3,710,718,000          
Restricted Assets [member]                          
Summary of loans debentures and finance leases [line items]                          
Restriction on encumbrance of assets         R$ 779,505,000       $ 150,000        
Percent restricted consolidated tangible assets         15.00% 15.00%              
Ultrapar International S.A. [member]                          
Summary of loans debentures and finance leases [line items]                          
Interest rate 5.25%   5.25% 5.25%           5.25%   5.25% 5.25%
Notes to foreign market R$ 1,818,845,000 R$ 1,039,340,000 R$ 2,598,350,000 R$ 3,897,525,000           $ 350,000 $ 200,000 $ 500,000 $ 750,000
Borrowings, maturity date June 2029 October 2026 June 2029 October 2026                  
Issue percent of face value 99.994%   100.00% 98.097%                  
Northeast Constitutional Financing Fund [member]                          
Summary of loans debentures and finance leases [line items]                          
Interest rate         10.00%       10.00%        
Discount on interest rate         15.00% 15.00%              
Long term interest rate [member]                          
Summary of loans debentures and finance leases [line items]                          
Long term interest rate         4.55%       4.55%        
Foreign loans [member] | IPP [member]                          
Summary of loans debentures and finance leases [line items]                          
Foreign currency - denominated loans         R$ 1,221,225,000       $ 235,000        
Loans paid off in advance | $           $ 160,000              
Floating interest rates in dollar change in foreign loan         104.1% of DI 104.1% of DI              
Foreign loans [member] | Global petroleum products trading corporation [member]                          
Summary of loans debentures and finance leases [line items]                          
Foreign currency - denominated loans | $                 $ 60,000        
Borrowings, maturity date         June 22, 2020 June 22, 2020              
Borrowings, adjustment to interest rate basis         2.00%       2.00%        
Floating interest rates in dollar change in foreign loan         105.9% of DI 105.9% of DI              
BNDES [member] | Subsidiaries [member]                          
Summary of loans debentures and finance leases [line items]                          
Loans paid off in advance         R$ 39,843,000                
Debenture two [member]                          
Summary of loans debentures and finance leases [line items]                          
Borrowings         R$ 1,000,000                
Final maturity         April 18, 2022 April 18, 2022              
Payment of the face value         Lump sum at final maturity Lump sum at final maturity              
Payment of interest         Semiannually Semiannually              
Reprice         Not applicable Not applicable              
Floating interest rates in dollar change in foreign loan         95.0% of DI 95.0% of DI              
Amount:         R$ 660,139,000                
Debenture five [member]                          
Summary of loans debentures and finance leases [line items]                          
Borrowings         R$ 1,000,000                
Final maturity         October 24, 2022 October 24, 2022              
Payment of the face value         Lump sum at final maturity Lump sum at final maturity              
Payment of interest         Semiannually Semiannually              
Reprice         Not applicable Not applicable              
Floating interest rates in dollar change in foreign loan         95.0% of DI 95.0% of DI              
Amount:         R$ 730,384,000                
Debenture eight [member]                          
Summary of loans debentures and finance leases [line items]                          
Borrowings         R$ 1,000,000                
Final maturity         December 18, 2023 December 18, 2023              
Payment of the face value         Lump sum at final maturity Lump sum at final maturity              
Payment of interest         Semiannually Semiannually              
Reprice         Not applicable Not applicable              
Floating interest rates in dollar change in foreign loan         97.5% of DI 97.5% of DI              
Amount:         R$ 660,000,000