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Business Segment and Geographic Information - Revenue by Client Sector (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 |  |  |
Operating expenses | 146,702,000 |  |  |
Operating income | 31,935,000 |  |  |
Successor | Institutional |  |  |  |
Business Segment and Geographic Information |  |  |  |
Gross revenues | 103,971,000 |  |  |
Successor | Wholesale |  |  |  |
Business Segment and Geographic Information |  |  |  |
Gross revenues | 38,153,000 |  |  |
Successor | Retail |  |  |  |
Business Segment and Geographic Information |  |  |  |
Gross revenues | 19,780,000 |  |  |
Successor | Market Data |  |  |  |
Business Segment and Geographic Information |  |  |  |
Gross revenues | $ 16,733,000 |  |  |
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
Operating expenses |  | 338,607,000 | 415,356,000 | 399,049,000
Operating income |  | 140,334,000 | 89,092,000 | 93,131,000
Predecessor | Institutional |  |  |  |
Business Segment and Geographic Information |  |  |  |
Gross revenues |  | 301,918,000 | 318,038,000 | 285,801,000
Predecessor | Wholesale |  |  |  |
Business Segment and Geographic Information |  |  |  |
Gross revenues |  | 99,028,000 | 118,451,000 | 109,945,000
Predecessor | Retail |  |  |  |
Business Segment and Geographic Information |  |  |  |
Gross revenues |  | 57,766,000 | 70,857,000 | 67,471,000
Predecessor | Market Data |  |  |  |
Business Segment and Geographic Information |  |  |  |
Gross revenues |  | $ 47,059,000 | $ 55,622,000 | $ 55,187,000

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