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Intangible Assets and Goodwill - Indefinite Lived Intangible Assets (Details) - Tradeweb Markets LLC - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Successor |  |
Intangible assets with indefinite useful lives |  |
Intangible assets which have an indefinite useful life | $ 323,100 |
Successor | Licenses |  |
Intangible assets with indefinite useful lives |  |
Intangible assets which have an indefinite useful life | 168,800 |
Successor | Tradenames |  |
Intangible assets with indefinite useful lives |  |
Intangible assets which have an indefinite useful life | $ 154,300 |
Predecessor |  |
Intangible assets with indefinite useful lives |  |
Intangible assets which have an indefinite useful life |  | $ 12,000
Predecessor | Licenses |  |
Intangible assets with indefinite useful lives |  |
Intangible assets which have an indefinite useful life |  | $ 12,000

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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