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Deferred Revenue (Details) - Tradeweb Markets LLC - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017
Successor
Changes in deferred revenue
Deferred revenue balance - beginning of period	$ 28,280
New billings	26,609
Revenue recognized	(27,006)
Deferred revenue balance - end of period	27,883	$ 28,280
Predecessor
Changes in deferred revenue
Deferred revenue balance - beginning of period	$ 28,280	29,673	$ 42,184
New billings		100,091	127,312
Revenue recognized		(101,484)	(139,823)
Deferred revenue balance - end of period		$ 28,280	$ 29,673

X

- Definition

Amount of deferred revenue recognized for new billing arising during the current reporting period.

+ References

No definition available.

+ Details

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X

- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130531-203044

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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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-Section 50
-Paragraph 8
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045

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- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

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- Details

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