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Fair Value of Financial Instruments - Fair Value Measurements (Details) - Tradeweb Markets LLC - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Predecessor
Fair Value of Financial Instruments
Money market funds		$ 101,154
Total assets measured at fair value		101,154
Contingent consideration payable		129,393
Total Liabilities, at fair value		129,393
Predecessor | Level 1
Fair Value of Financial Instruments
Money market funds		101,154
Total assets measured at fair value		101,154
Predecessor | Level 3
Fair Value of Financial Instruments
Contingent consideration payable		129,393
Total Liabilities, at fair value		$ 129,393
Successor
Fair Value of Financial Instruments
Money market funds	$ 127,927
Total assets measured at fair value	127,927
Successor | Level 1
Fair Value of Financial Instruments
Money market funds	127,927
Total assets measured at fair value	$ 127,927

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- Definition

Fair value portion of liabilities incurred for goods and services received that are used in an entity's business and related party payables.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

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+ References

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- Definition

Fair value of financial and nonfinancial obligations.

+ References

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-Publisher FASB
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-Topic 820
-SubTopic 10
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