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Share-Based Compensation Plans - Unrecognized Compensation (Details) - Tradeweb Markets LLC - Successor	12 Months Ended
	Dec. 31, 2018 USD ($)
Equity-settled PRSUs
Share-Based Compensation Plans
Total unrecognized compensation cost	$ 24,853,000
Weighted average recognition period	1 year 8 months 12 days
Cash-settled PRSUs
Share-Based Compensation Plans
Total unrecognized compensation cost	$ 419,000
Weighted average recognition period	1 year 9 months 18 days
Stock Options
Share-Based Compensation Plans
Total unrecognized compensation cost	$ 33,460,000
Weighted average recognition period	10 months 24 days

X

- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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No definition available.

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