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Significant Accounting Policies - Breakdown of Revenues Between Fixed and Variable (Details) - Tradeweb Markets LLC - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Successor |  |  |  |
Revenue Recognition |  |  |  |
Gross revenues | $ 178,637 |  |  |
Successor | Transaction Fee Revenue |  |  |  |
Revenue Recognition |  |  |  |
Gross revenues | 97,130 |  |  |
Successor | Commissions Revenue |  |  |  |
Revenue Recognition |  |  |  |
Gross revenues | 32,840 |  |  |
Successor | Other |  |  |  |
Revenue Recognition |  |  |  |
Gross revenues | 2,148 |  |  |
Successor | Variable |  |  |  |
Revenue Recognition |  |  |  |
Gross revenues | 96,833 |  |  |
Successor | Variable | Transaction Fee Revenue |  |  |  |
Revenue Recognition |  |  |  |
Gross revenues | 73,800 |  |  |
Successor | Variable | Subscription Fees including Refinitiv market data |  |  |  |
Revenue Recognition |  |  |  |
Gross revenues | 425 |  |  |
Successor | Variable | Commissions Revenue |  |  |  |
Revenue Recognition |  |  |  |
Gross revenues | 22,608 |  |  |
Successor | Fixed |  |  |  |
Revenue Recognition |  |  |  |
Gross revenues | 81,804 |  |  |
Successor | Fixed | Transaction Fee Revenue |  |  |  |
Revenue Recognition |  |  |  |
Gross revenues | 23,330 |  |  |
Successor | Fixed | Subscription Fees including Refinitiv market data |  |  |  |
Revenue Recognition |  |  |  |
Gross revenues | 46,094 |  |  |
Successor | Fixed | Commissions Revenue |  |  |  |
Revenue Recognition |  |  |  |
Gross revenues | 10,232 |  |  |
Successor | Fixed | Other |  |  |  |
Revenue Recognition |  |  |  |
Gross revenues | $ 2,148 |  |  |
Predecessor |  |  |  |
Revenue Recognition |  |  |  |
Gross revenues |  | $ 505,771 | $ 562,968 | $ 518,404
Predecessor | Transaction Fee Revenue |  |  |  |
Revenue Recognition |  |  |  |
Gross revenues |  | 273,751 | 267,020 | 230,171
Predecessor | Commissions Revenue |  |  |  |
Revenue Recognition |  |  |  |
Gross revenues |  | 79,830 | 96,745 | 91,663
Predecessor | Other |  |  |  |
Revenue Recognition |  |  |  |
Gross revenues |  | 8,209 | 4,669 | 4,587
Predecessor | Variable |  |  |  |
Revenue Recognition |  |  |  |
Gross revenues |  | 258,761 | 268,927 | 231,780
Predecessor | Variable | Transaction Fee Revenue |  |  |  |
Revenue Recognition |  |  |  |
Gross revenues |  | 208,049 | 210,198 | 176,060
Predecessor | Variable | Subscription Fees including Refinitiv market data |  |  |  |
Revenue Recognition |  |  |  |
Gross revenues |  | 1,305 | 1,575 | 1,496
Predecessor | Variable | Commissions Revenue |  |  |  |
Revenue Recognition |  |  |  |
Gross revenues |  | 49,367 | 57,118 | 54,194
Predecessor | Variable | Other |  |  |  |
Revenue Recognition |  |  |  |
Gross revenues |  | 40 | 36 | 30
Predecessor | Fixed |  |  |  |
Revenue Recognition |  |  |  |
Gross revenues |  | 247,010 | 294,041 | 286,624
Predecessor | Fixed | Transaction Fee Revenue |  |  |  |
Revenue Recognition |  |  |  |
Gross revenues |  | 65,702 | 56,822 | 54,111
Predecessor | Fixed | Subscription Fees including Refinitiv market data |  |  |  |
Revenue Recognition |  |  |  |
Gross revenues |  | 142,676 | 192,959 | 190,487
Predecessor | Fixed | Commissions Revenue |  |  |  |
Revenue Recognition |  |  |  |
Gross revenues |  | 30,463 | 39,627 | 37,469
Predecessor | Fixed | Other |  |  |  |
Revenue Recognition |  |  |  |
Gross revenues |  | $ 8,169 | $ 4,633 | $ 4,557

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