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Intangible Assets and Goodwill - Summary of Goodwill (Details) - Tradeweb Markets LLC - USD ($) $ in Thousands | Dec. 31, 2018 | Oct. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Refinitiv |  |  |
Goodwill |  |  |
Goodwill |  | $ 2,694,797 |
Successor |  |  |
Goodwill |  |  |
Goodwill | $ 2,694,797 |  |
Successor | Refinitiv |  |  |
Goodwill |  |  |
Goodwill | $ 2,694,797 |  |
Predecessor |  |  |
Goodwill |  |  |
Goodwill |  |  | $ 563,421
Predecessor | TR |  |  |
Goodwill |  |  |
Goodwill |  |  | 334,185
Predecessor | Merger |  |  |
Goodwill |  |  |
Goodwill |  |  | 66,484
Predecessor | RaffCap |  |  |
Goodwill |  |  |
Goodwill |  |  | 49,200
Predecessor | BondDesk |  |  |
Goodwill |  |  |
Goodwill |  |  | 103,158
Predecessor | Other |  |  |
Goodwill |  |  |
Goodwill |  |  | $ 10,394

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