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Business Segment and Geographic Information - Revenue and Long-lived Assets by Geographic Region (Details) - Tradeweb Markets LLC - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Successor |  |  |  |
Business Segment and Geographic Information |  |  |  |
Gross revenues | $ 178,637,000 |  |  |
Net revenue | 178,637,000 |  |  |
Long-lived assets | 4,284,355,000 |  |  |
Successor | U.S. |  |  |  |
Business Segment and Geographic Information |  |  |  |
Gross revenues | 115,907,000 |  |  |
Long-lived assets | 4,276,568,000 |  |  |
Successor | International |  |  |  |
Business Segment and Geographic Information |  |  |  |
Gross revenues | 62,730,000 |  |  |
Long-lived assets | $ 7,787,000 |  |  |
Predecessor |  |  |  |
Business Segment and Geographic Information |  |  |  |
Gross revenues |  | $ 505,771,000 | $ 562,968,000 | $ 518,404,000
Contingent consideration to related parties |  | (26,830,000) | (58,520,000) | (26,224,000)
Net revenue |  | 478,941,000 | 504,448,000 | 492,180,000
Long-lived assets |  |  | 853,586,000 |
Predecessor | U.S. |  |  |  |
Business Segment and Geographic Information |  |  |  |
Gross revenues |  | 324,304,000 | 385,176,000 | 365,308,000
Long-lived assets |  |  | 845,599,000 |
Predecessor | International |  |  |  |
Business Segment and Geographic Information |  |  |  |
Gross revenues |  | $ 181,467,000 | 177,792,000 | $ 153,096,000
Long-lived assets |  |  | $ 7,987,000 |

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