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Stockholders' Equity - Amendment and Restatement of Certificate of Incorporation (Details) |  | 12 Months Ended |
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Apr. 03, 2019 vote | Dec. 31, 2022 vote $ / shares shares | Dec. 31, 2021 $ / shares
Tradeweb Markets LLC |  |  |
Class of Stock [Line Items] |  |  |
Threshold percentage of economic interest for conversion |  | 10.00% |
Class A Common Stock |  |  |
Class of Stock [Line Items] |  |  |
Number of votes per common stock | vote | 1 | 1 |
Common stock, par value (in dollars per share) | $ / shares |  | $ 0.00001 | $ 0.00001
Conversion ratio |  | 1 |
Conversion of common stock (in shares) | shares |  | 1 |
Class B Common Stock |  |  |
Class of Stock [Line Items] |  |  |
Number of votes per common stock | vote | 10 | 10 |
Common stock, par value (in dollars per share) | $ / shares |  | $ 0.00001 | 0.00001
Conversion ratio |  | 1 |
Class C Common Stock |  |  |
Class of Stock [Line Items] |  |  |
Number of votes per common stock | vote | 1 | 1 |
Common stock, par value (in dollars per share) | $ / shares |  | $ 0.00001 | 0.00001
Conversion ratio |  | 1 |
Conversion of common stock (in shares) | shares |  | 1 |
Class D Common Stock |  |  |
Class of Stock [Line Items] |  |  |
Number of votes per common stock | vote | 10 | 10 |
Common stock, par value (in dollars per share) | $ / shares |  | $ 0.00001 | $ 0.00001
Conversion ratio |  | 1 |

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