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Intangible Assets and Goodwill - Finite Lived Intangible Assets (Details) - Tradeweb Markets LLC - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Successor |  |
Intangible assets that are subject to amortization |  |
Cost | $ 1,082,600 |
Accumulated Amortization | (24,852) |
Net Carrying Amount | $ 1,057,748 |
Successor | Customer relationships | Refinitiv |  |
Intangible assets that are subject to amortization |  |
Amortization Period | 12 years |
Cost | $ 928,200 |
Accumulated Amortization | (19,338) |
Net Carrying Amount | $ 908,862 |
Successor | Content and data |  |
Intangible assets that are subject to amortization |  |
Amortization Period | 7 years |
Cost | $ 154,400 |
Accumulated Amortization | (5,514) |
Net Carrying Amount | $ 148,886 |
Predecessor |  |
Intangible assets that are subject to amortization |  |
Cost |  | $ 529,184
Accumulated Amortization |  | (318,965)
Net Carrying Amount |  | $ 210,219
Predecessor | Customer relationships | Fixed Income Business |  |
Intangible assets that are subject to amortization |  |
Amortization Period |  | 13 years
Cost |  | $ 155,284
Accumulated Amortization |  | (155,270)
Net Carrying Amount |  | $ 14
Predecessor | Customer relationships | DW |  |
Intangible assets that are subject to amortization |  |
Amortization Period |  | 11 years
Cost |  | $ 65,000
Accumulated Amortization |  | (42,348)
Net Carrying Amount |  | $ 22,652
Predecessor | Customer relationships | RaffCap |  |
Intangible assets that are subject to amortization |  |
Amortization Period |  | 12 years
Cost |  | $ 17,600
Accumulated Amortization |  | (9,166)
Net Carrying Amount |  | $ 8,434
Predecessor | Customer relationships | BondDesk |  |
Intangible assets that are subject to amortization |  |
Amortization Period |  | 15 years
Cost |  | $ 104,000
Accumulated Amortization |  | (28,806)
Net Carrying Amount |  | $ 75,194
Predecessor | Customer relationships | Other |  |
Intangible assets that are subject to amortization |  |
Amortization Period |  | 10 years
Cost |  | $ 2,100
Accumulated Amortization |  | (385)
Net Carrying Amount |  | $ 1,715
Predecessor | Tradenames |  |
Intangible assets that are subject to amortization |  |
Amortization Period |  | 10 years
Cost |  | $ 200
Accumulated Amortization |  | (125)
Net Carrying Amount |  | 75
Predecessor | Liquidity contracts |  |
Intangible assets that are subject to amortization |  |
Amortization Period | 16 years |
Cost |  | 185,000
Accumulated Amortization |  | (82,865)
Net Carrying Amount |  | $ 102,135

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