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Furniture, Equipment, Purchased Software and Leasehold Improvements (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 |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Furniture, equipment, purchased software and leasehold improvements, net of accumulated depreciation and amortization | $ 38,128,000 |  |  |
Depreciation and amortization expense | 3,094,000 |  |  |
Successor | Furniture, equipment, purchased software and leasehold improvements |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Accumulated depreciation and amortization | (3,036,000) |  |  |
Furniture, equipment, purchased software and leasehold improvements, net of accumulated depreciation and amortization | 38,128,000 |  |  |
Successor | Computer hardware |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Gross amount | 22,818,000 |  |  |
Successor | Leasehold improvements |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Gross amount | 12,339,000 |  |  |
Successor | Purchased software |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Gross amount | 3,039,000 |  |  |
Successor | Furniture and office equipment |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Gross amount | $ 2,968,000 |  |  |
Predecessor |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Furniture, equipment, purchased software and leasehold improvements, net of accumulated depreciation and amortization |  |  | $ 27,031,000 |
Depreciation and amortization expense |  | $ 9,270,000 | 11,959,000 | $ 12,910,000
Predecessor | Furniture, equipment, purchased software and leasehold improvements |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Accumulated depreciation and amortization |  |  | (87,301,000) |
Furniture, equipment, purchased software and leasehold improvements, net of accumulated depreciation and amortization |  |  | 27,031,000 |
Predecessor | Computer hardware |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Gross amount |  |  | 67,852,000 |
Predecessor | Leasehold improvements |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Gross amount |  |  | 27,139,000 |
Predecessor | Purchased software |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Gross amount |  |  | 12,991,000 |
Predecessor | Furniture and office equipment |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Gross amount |  |  | $ 6,350,000 |

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