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Commitments and Contingencies - Commitments (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 |  |  |  |
Future minimum rental payments |  |  |  |
2019 | $ 11,393,000 |  |  |
2020 | 7,580,000 |  |  |
2021 | 5,317,000 |  |  |
2022 | 4,051,000 |  |  |
2023 | 3,877,000 |  |  |
Thereafter | 11,156,000 |  |  |
Total | 43,374,000 |  |  |
Rent expense | 2,733,000 |  |  |
Successor | Letter of credit | Guaranteed by Refinitiv |  |  |  |
Future minimum rental payments |  |  |  |
Maximum borrowing capacity | $ 1,200,000 |  |  |
Predecessor |  |  |  |
Future minimum rental payments |  |  |  |
Rent expense |  | $ 9,011,000 | $ 11,774,000 | $ 13,253,000

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