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Organization (Details) $ / shares in Units, $ in Thousands, $ in Millions		1 Months Ended	3 Months Ended		6 Months Ended
	Jan. 19, 2024 USD ($)	Aug. 31, 2023 AUD ($)	Jun. 30, 2024 $ / shares shares	Jun. 30, 2023 shares	Jun. 30, 2024 $ / shares shares	Jun. 30, 2023 shares	Dec. 31, 2023 $ / shares
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net
Stock split ratio, common stock					1
Weighted average unvested RSUs and unsettled vested PRSUs that were considered participating securities (in shares)			125,012	241,963	142,484	266,790
Dilutive securities (in shares)			1,733,789		1,842,327
Class A Common Stock
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net
Common stock, par value (in dollars per share) | $ / shares			$ 0.00001		$ 0.00001		$ 0.00001
Class B Common Stock
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net
Common stock, par value (in dollars per share) | $ / shares			0.00001		0.00001		0.00001
Class C Common Stock
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net
Common stock, par value (in dollars per share) | $ / shares			0.00001		0.00001		0.00001
Class D Common Stock
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net
Common stock, par value (in dollars per share) | $ / shares			$ 0.00001		$ 0.00001		$ 0.00001
R8FIN
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net
Purchase price, net of cash acquired and excluding working capital and other closing adjustments | $	$ 125,902
Yieldbroker
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net
Purchase price, net of cash acquired and excluding working capital and other closing adjustments | $		$ 123.6
Tradeweb Markets LLC
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net
Ownership interest			90.20%	90.20%	90.20%	90.20%	90.20%
Ownership percentage, continuing LLC owners			9.80%	9.80%	9.80%	9.80%	9.80%
Tradeweb Markets LLC | Refinitiv
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net
Ownership interest			50.80%		50.80%
Tradeweb Markets LLC | Public Investors
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net
Ownership percentage, continuing LLC owners			49.20%		49.20%
Tradeweb Markets LLC | Class D Common Stock | Other Stockholders
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net
Ownership percentage, continuing LLC owners			10.00%		10.00%
Tradeweb Markets Inc | Refinitiv
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net
Ownership interest			89.90%		89.90%
Tradeweb Markets Inc | Public Investors
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net
Voting power percentage			10.10%		10.10%
Tradeweb Markets Inc | Class A Common Stock | Public Investors
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net
Number of share owned (in shares)			116,282,605		116,282,605
Tradeweb Markets Inc | Class B Common Stock | Refinitiv
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net
Number of share owned (in shares)			96,933,192		96,933,192
Tradeweb Markets Inc | Class C Common Stock | Refinitiv
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net
Number of share owned (in shares)			18,000,000		18,000,000
Tradeweb Markets Inc | Class D Common Stock | Refinitiv
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net
Number of share owned (in shares)			4,988,329		4,988,329
Tradeweb Markets Inc | Class D Common Stock | Other Stockholders
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net
Number of share owned (in shares)			88,644		88,644
Voting power percentage			0.10%		0.10%

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