Document and Entity Information - shares
 9 Months Ended
Sep. 30, 2019
Oct. 31, 2019
Document Type 10-Q  
Document Period End Date Sep. 30, 2019  
Entity Registrant Name Victory Capital Holdings, Inc.  
Entity Current Reporting Status Yes  
Entity Filer Category Non-accelerated Filer  
Entity Interactive Data Current Yes  
Entity Small Business false  
Entity Emerging Growth Company true  
Entity Shell Company false  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q3  
Entity Central Index Key 0001570827  
Amendment Flag false  
Entity Ex Transition Period false  
Class A    
Entity Common Stock, Shares Outstanding   16,325,352
Class B    
Entity Common Stock, Shares Outstanding   51,244,365