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Equity - Dividends and Allocation of Net Income (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Allocation of net income [abstract]      
Net income for the period attributable to shareholders of Ultrapar R$ 373,526 R$ 1,150,421 R$ 1,526,505
Minimum mandatory dividends 186,763    
Legal reserve (5% of the net income) 18,676    
Additional dividends to minimum mandatory dividends 168,087    
Total allocation of net income 373,526    
Allocation Of Dividends [Abstract]      
Minimum mandatory dividends 186,763    
Additional dividends to minimum mandatory dividends 168,087    
Dividends on statutory reserve 124,002    
Total allocation 478,852    
Interim dividends paid (R$ 0.20 per share) (217,382)    
Dividends payable (R$ 0.24 per share) R$ 261,470