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Non-Controlling Interests - Summary of Equity Changes Due to Changes in Corporation Ownership (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Noncontrolling Interest [Abstract]        
Net income attributable to Tradeweb Markets Inc. $ 68,344 $ 55,316 $ 151,309 $ 123,175
Increase/(decrease) in Tradeweb Markets Inc.’s additional paid-in capital as a result of ownership changes in TWM LLC (1,300)      
Increase/(decrease) in Tradeweb Markets Inc.’s additional paid-in capital as a result of ownership changes in TWM LLC   4,797 28,705 85,462
Net transfers (to) from non-controlling interests (1,300) 4,797 28,705 85,462
Change from net income attributable to Tradeweb Markets Inc. and transfers (to) from non-controlling interests $ 67,044 $ 60,113 $ 180,014 $ 208,637