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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
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

X

- 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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X

- 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

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