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Regulatory Capital Requirements (Details) - Tradeweb Markets LLC - Reportable Legal Entities - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Successor | TWL |  |
Regulatory Capital Requirements |  |
Regulatory Capital | $ 18,986 |
Regulatory Capital Requirement | 2,698 |
Excess Regulatory Capital | 16,288 |
Successor | DW |  |
Regulatory Capital Requirements |  |
Regulatory Capital | 41,164 |
Regulatory Capital Requirement | 1,803 |
Excess Regulatory Capital | 39,361 |
Successor | TWD |  |
Regulatory Capital Requirements |  |
Regulatory Capital | 24,042 |
Regulatory Capital Requirement | 599 |
Excess Regulatory Capital | 23,443 |
Successor | TEL |  |
Regulatory Capital Requirements |  |
Regulatory Capital | 46,157 |
Regulatory Capital Requirement | 17,493 |
Excess Regulatory Capital | 28,664 |
Successor | TWJ |  |
Regulatory Capital Requirements |  |
Regulatory Capital | 10,592 |
Regulatory Capital Requirement | 3,413 |
Excess Regulatory Capital | 7,179 |
Successor | TW SEF |  |
Regulatory Capital Requirements |  |
Financial Resources | 31,232 |
Required Financial Resources | 10,500 |
Excess Financial Resources | 20,732 |
Liquid Financial Assets | 16,662 |
Required Liquid Financial Assets | 5,250 |
Excess Liquid Financial Assets | 11,412 |
Successor | DW SEF |  |
Regulatory Capital Requirements |  |
Financial Resources | 17,837 |
Required Financial Resources | 5,169 |
Excess Financial Resources | 12,668 |
Liquid Financial Assets | 11,888 |
Required Liquid Financial Assets | 2,585 |
Excess Liquid Financial Assets | $ 9,303 |
Predecessor | TWL |  |
Regulatory Capital Requirements |  |
Regulatory Capital |  | $ 22,551
Regulatory Capital Requirement |  | 1,589
Excess Regulatory Capital |  | 20,962
Predecessor | DW |  |
Regulatory Capital Requirements |  |
Regulatory Capital |  | 35,546
Regulatory Capital Requirement |  | 1,612
Excess Regulatory Capital |  | 33,934
Predecessor | TWD |  |
Regulatory Capital Requirements |  |
Regulatory Capital |  | 16,965
Regulatory Capital Requirement |  | 378
Excess Regulatory Capital |  | 16,587
Predecessor | TEL |  |
Regulatory Capital Requirements |  |
Regulatory Capital |  | 31,509
Regulatory Capital Requirement |  | 18,034
Excess Regulatory Capital |  | 13,475
Predecessor | TWJ |  |
Regulatory Capital Requirements |  |
Regulatory Capital |  | 5,326
Regulatory Capital Requirement |  | 961
Excess Regulatory Capital |  | 4,365
Predecessor | TW SEF |  |
Regulatory Capital Requirements |  |
Financial Resources |  | 23,349
Required Financial Resources |  | 10,500
Excess Financial Resources |  | 12,849
Liquid Financial Assets |  | 14,084
Required Liquid Financial Assets |  | 5,250
Excess Liquid Financial Assets |  | 8,834
Predecessor | DW SEF |  |
Regulatory Capital Requirements |  |
Financial Resources |  | 20,069
Required Financial Resources |  | 5,875
Excess Financial Resources |  | 14,194
Liquid Financial Assets |  | 13,865
Required Liquid Financial Assets |  | 2,893
Excess Liquid Financial Assets |  | $ 10,972

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