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Related Party Transactions - Transactions with Related Parties (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 |  |  |  |
Related Party Transactions |  |  |  |
Interest income from money market funds invested and savings deposited | $ 17,000 |  |  |
Successor | Refinitiv | Shared Services |  |  |  |
Related Party Transactions |  |  |  |
Related party expense | 1,075,000 |  |  |
Successor | Refinitiv | Market Data License Agreements |  |  |  |
Related Party Transactions |  |  |  |
Related party revenue | 13,467,000 |  |  |
Successor | Refinitiv | Operating Expense Reimbursement |  |  |  |
Related Party Transactions |  |  |  |
Related party expense | 3,837,000 |  |  |
Successor | Banks |  |  |  |
Related Party Transactions |  |  |  |
Interest income from money market funds invested and savings deposited | 17,000 |  |  |
Successor | Banks | Transaction, subscription and other fees |  |  |  |
Related Party Transactions |  |  |  |
Related party revenue | $ 90,845,000 |  |  |
Predecessor |  |  |  |
Related Party Transactions |  |  |  |
Interest income from money market funds invested and savings deposited |  | $ 34,000 | $ 40,000 | $ 80,000
Predecessor | TR | Shared Services |  |  |  |
Related Party Transactions |  |  |  |
Related party expense |  | 3,225,000 | 4,300,000 | 4,300,000
Predecessor | TR | Market Data License Agreements |  |  |  |
Related Party Transactions |  |  |  |
Related party revenue |  | 36,851,000 | 50,125,000 | 50,564,000
Predecessor | TR | Operating Expense Reimbursement |  |  |  |
Related Party Transactions |  |  |  |
Related party expense |  | 28,736,000 | 38,361,000 | 34,350,000
Predecessor | Banks |  |  |  |
Related Party Transactions |  |  |  |
Interest income from money market funds invested and savings deposited |  | 34,000 | 40,000 | 80,000
Predecessor | Banks | Transaction, subscription and other fees |  |  |  |
Related Party Transactions |  |  |  |
Related party revenue |  | $ 211,234,000 | $ 232,436,000 | $ 211,743,000

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