Earnings Per Share - Schedule of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Numerator:
Net income attributable to Tradeweb Markets Inc.	$ 185,636	$ 113,916	$ 487,800	$ 359,297
Less: Distributed and undistributed earnings allocated to participating securities	(138)	(68)	(379)	(231)
Net income attributable to outstanding shares of Class A and Class B common stock - Basic	185,498	113,848	487,421	359,066
Net income attributable to outstanding shares of Class A and Class B common stock - Diluted	$ 185,498	$ 113,848	$ 487,421	$ 359,066
Denominator:
Weighted average shares of Class A and Class B common stock outstanding - Basic (in shares)	213,359,090	213,206,193	213,263,111	213,026,732
Dilutive effect (in shares)	1,624,396		1,688,168
Weighted average shares of Class A and Class B common stock outstanding - Diluted (in shares)	214,983,486	215,096,974	214,951,279	214,885,210
Earnings per share - Basic (in dollars per share)	$ 0.87	$ 0.53	$ 2.29	$ 1.69
Earnings per share - Diluted (in dollars per share)	$ 0.86	$ 0.53	$ 2.27	$ 1.67
Weighted average unvested RSUs and unsettled vested PRSUs that were considered participating securities (in shares)	159,088	126,903	165,713	137,252
PRSUs
Denominator:
Dilutive effect (in shares)	467,912	625,822	451,111	564,996
Options
Denominator:
Dilutive effect (in shares)	288,067	363,623	290,111	470,816
RSUs and RSAs
Denominator:
Dilutive effect (in shares)	353,785	405,562	412,545	367,375
PSUs
Denominator:
Dilutive effect (in shares)	514,632	495,774	534,401	455,291