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Equity - Dividends and Allocation of Net Income (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Shareholders equity details [abstract]      
Net income for the year attributable to shareholders of Ultrapar R$ 1,150,421 R$ 1,526,505 R$ 1,537,837
Minimum mandatory dividends 575,210    
Interim dividends paid (R$ 0.56 per share) (304,241)    
Mandatory dividends payable - Current liabilities 270,969    
Additional dividends to the minimum mandatory dividends - equity 109,355    
Dividends payable (R$ 0.70 per share) 380,324    
Legal reserve (5% of the net income) 57,521    
Statutory investments reserve R$ 408,335