XML 8 R1.htm IDEA: XBRL DOCUMENT v3.8.0.1
Document and Entity Information - shares
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Document And Entity Information    
Entity Registrant Name ULTRAPAR HOLDINGS INC  
Entity Central Index Key 0001094972  
Document Type 20-F  
Document Period End Date Dec. 31, 2017  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Is Entity a Well-known Seasoned Issuer? No  
Is Entity a Voluntary Filer? No  
Is Entity's Reporting Status Current? No  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding 28,935,260 28,944,097
Document Fiscal Period Focus FY  
Document Fiscal Year Focus 2017