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Fair Value Measurements - Summary of Categorization of Assets and Liabilities Measured at Fair Value (Detail) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Assets: |  |
Securities owned, at fair value | $ 32,574 | $ 17,319
Liabilities: |  |
Deferred consideration (Note 11) | 207,748 | 173,024
Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Cash equivalents | 2,577 | 317
Securities owned, at fair value | 32,574 | 17,319
Total | 35,151 | 17,636
Liabilities: |  |
Deferred consideration (Note 11) | 207,748 | 173,024
Securities sold, but not yet purchased |  | 582
Total |  | 173,606
Fair Value, Measurements, Nonrecurring [Member] |  |
Assets: |  |
AdvisorEngine Inc. – Financial interests |  | 28,172
Liabilities: |  |
Convertible notes | 24,344 |
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Cash equivalents | 2,577 | 317
Securities owned, at fair value | 24,101 | 17,319
Total | 26,678 | 17,636
Liabilities: |  |
Securities sold, but not yet purchased |  | 582
Total |  | 582
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Securities owned, at fair value | 8,473 |
Total | 8,473 |
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |
Liabilities: |  |
Convertible notes | 24,344 |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Liabilities: |  |
Deferred consideration (Note 11) | $ 207,748 | 173,024
Total |  | 173,024
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |
Assets: |  |
AdvisorEngine Inc. – Financial interests |  | $ 28,172

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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 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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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 No definition available. + Details
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