v3.19.2
Document and Entity Information - shares
6 Months Ended
Jun. 30, 2019
Aug. 05, 2019
Entity Registrant Name Tradeweb Markets Inc.  
Entity Central Index Key 0001758730  
Document Type 10-Q  
Document Period End Date Jun. 30, 2019  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Entity Current Reporting Status No  
Entity Filer Category Non-accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company true  
Entity Ex Transition Period true  
Entity Shell Company false  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q2  
Class A common stock    
Entity Common Stock, Shares Outstanding   46,000,000
Class B common stock    
Entity Common Stock, Shares Outstanding   96,933,192
Class C common stock    
Entity Common Stock, Shares Outstanding   10,006,269
Class D common stock    
Entity Common Stock, Shares Outstanding   69,282,736