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Income Taxes - Components of Provision (Tradeweb Markets LLC and Subsidiaries) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2019 | Sep. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Current: |  |  |  |  |  |  |
Financial Designation, Predecessor and Successor [Fixed List] | Successor | Successor | Successor | Predecessor | Successor | Successor | Predecessor
Federal |  |  |  |  | $ 21,373 |  |
State and Local |  | $ 1,235 |  | $ 5,739 | 11,537 |  | $ 4,331
Foreign |  | 1,212 |  | 3,559 | 4,368 |  | 2,748
Total current tax expense |  | 2,447 |  | 9,298 | 37,278 |  | 7,079
Deferred: |  |  |  |  |  |  |
Federal |  | 680 |  | 1,085 | (88) |  | (433)
State and local |  | 288 |  | 1,517 | 18,194 |  | (517)
Foreign |  |  |  |  | (3,082) |  |
Total deferred tax expense |  | 968 |  | 2,602 | 15,024 |  | (950)
Total provision for income taxes |  | $ 3,415 |  | $ 11,900 | $ 52,302 |  | $ 6,129

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