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Significant Accounting Policies - Breakdown of Revenues Between Fixed and Variable (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Sep. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Revenue Recognition |  |  |  |  |  |  |  |  |  |
Financial Designation, Predecessor and Successor [Fixed List] | Successor | Successor |  |  |  | Successor | Predecessor | Successor | Successor | Predecessor
Gross revenues |  | $ 178,637 |  |  |  |  | $ 505,771 | $ 775,566 |  | $ 562,968
Compensation expense |  | 9,400 |  |  |  |  | 15,900 | 50,700 |  | 26,100
Transaction fees |  |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |  |
Gross revenues |  | 97,130 |  |  |  |  | 273,751 | 423,583 |  | 267,020
Commissions |  |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |  |
Gross revenues |  | 32,840 |  |  |  |  | 79,830 | 149,365 |  | 96,745
Other |  |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |  |
Gross revenues |  | $ 2,148 |  |  |  |  | $ 8,209 | $ 8,252 |  | $ 4,669
Variable |  |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |  |
Financial Designation, Predecessor and Successor [Fixed List] |  | Successor |  |  |  |  | Predecessor | Successor |  |
Gross revenues |  | $ 96,833 |  |  |  |  | $ 258,761 | $ 437,743 |  |
Variable | Transaction fees |  |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |  |
Gross revenues |  | 73,800 |  |  |  |  | 208,049 | 325,178 |  |
Variable | Subscription Fees including Refinitiv market data |  |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |  |
Gross revenues |  | 425 |  |  |  |  | 1,305 | 1,736 |  |
Variable | Commissions |  |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |  |
Gross revenues |  | $ 22,608 |  |  |  |  | 49,367 | 109,995 |  |
Variable | Other |  |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |  |
Gross revenues |  |  |  |  |  |  | $ 40 | $ 834 |  |
Fixed |  |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |  |
Financial Designation, Predecessor and Successor [Fixed List] |  | Successor |  |  |  |  | Predecessor | Successor |  |
Gross revenues |  | $ 81,804 |  |  |  |  | $ 247,010 | $ 337,823 |  |
Fixed | Transaction fees |  |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |  |
Gross revenues |  | 23,330 |  |  |  |  | 65,702 | 98,405 |  |
Fixed | Subscription Fees including Refinitiv market data |  |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |  |
Gross revenues |  | 46,094 |  |  |  |  | 142,676 | 192,630 |  |
Fixed | Commissions |  |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |  |
Gross revenues |  | 10,232 |  |  |  |  | 30,463 | 39,370 |  |
Fixed | Other |  |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |  |
Gross revenues |  | $ 2,148 |  |  |  |  | $ 8,169 | $ 7,418 |  |
Tradeweb Markets LLC |  |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |  |
Financial Designation, Predecessor and Successor [Fixed List] | Successor | Successor | Predecessor | Predecessor | Predecessor |  |  |  |  |
Gross revenues | $ 186,792 | $ 178,637 | $ 165,253 | $ 171,015 | $ 169,503 |  |  |  |  |
Tradeweb Markets LLC | Transaction fees |  |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |  |
Gross revenues | 102,640 | 97,130 | 92,582 | 91,030 | 90,139 |  |  |  |  |
Tradeweb Markets LLC | Commissions |  |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |  |
Gross revenues | 34,197 | 32,840 | 24,394 | 27,553 | 27,883 |  |  |  |  |
Tradeweb Markets LLC | Other |  |  |  |  |  |  |  |  |  |
Revenue Recognition |  |  |  |  |  |  |  |  |  |
Gross revenues | $ 1,894 | $ 2,148 | $ 2,587 | $ 2,704 | $ 2,918 |  |  |  |  |

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