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Fair Value Measurements - Summary of Categorization of Assets and Liabilities Measured at Fair Value (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Aug. 13, 2020 | Jun. 16, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Assets: |  |  |  |
Securities owned, at fair value | $ 34,895 |  |  | $ 17,319
Liabilities: |  |  |  |
Deferred consideration (Note 12) | 230,137 |  |  | 173,024
Fair Value, Measurements, Recurring [Member] |  |  |  |
Assets: |  |  |  |
Cash equivalents | 660 |  |  | 317
Total | 35,555 |  |  | 17,636
Liabilities: |  |  |  |
Deferred consideration (Note 12) | 230,137 |  |  | 173,024
Securities sold, but not yet purchased |  |  |  | 582
Total |  |  |  | 173,606
Fair Value, Measurements, Recurring [Member] | Exchange Traded Funds [Member] |  |  |  |
Assets: |  |  |  |
Securities owned, at fair value | 24,165 |  |  | 17,319
Fair Value, Measurements, Recurring [Member] | Federal Agency [Member] |  |  |  |
Assets: |  |  |  |
Securities owned, at fair value | 8,613 |  |  |
Fair Value, Measurements, Recurring [Member] | All Other Corporate Bonds [Member] |  |  |  |
Assets: |  |  |  |
Securities owned, at fair value | 2,117 |  |  |
Fair Value, Measurements, Nonrecurring [Member] |  |  |  |
Assets: |  |  |  |
AdvisorEngine Inc. – Financial interests | 0 |  |  | 28,172
Thesys Group, Inc. – Series Y preferred stock | 0 |  |  |
Total | 0 |  |  |
Liabilities: |  |  |  |
Convertible notes | 170,191 | $ 24,344 | $ 145,847 |
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Assets: |  |  |  |
Cash equivalents | 660 |  |  | 317
Total | 24,825 |  |  | 17,636
Liabilities: |  |  |  |
Deferred consideration (Note 12) | 0 |  |  |
Securities sold, but not yet purchased |  |  |  | 582
Total |  |  |  | 582
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Exchange Traded Funds [Member] |  |  |  |
Assets: |  |  |  |
Securities owned, at fair value | 24,165 |  |  | 17,319
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |
Assets: |  |  |  |
AdvisorEngine Inc. – Financial interests | 0 |  |  |
Thesys Group, Inc. – Series Y preferred stock | 0 |  |  |
Total | 0 |  |  |
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Assets: |  |  |  |
Total | 10,730 |  |  |
Liabilities: |  |  |  |
Deferred consideration (Note 12) | 0 |  |  |
Total |  |  |  | 0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Federal Agency [Member] |  |  |  |
Assets: |  |  |  |
Securities owned, at fair value | 8,613 |  |  |
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | All Other Corporate Bonds [Member] |  |  |  |
Assets: |  |  |  |
Securities owned, at fair value | 2,117 |  |  |
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |
Assets: |  |  |  |
AdvisorEngine Inc. – Financial interests | 0 |  |  |
Thesys Group, Inc. – Series Y preferred stock | 0 |  |  |
Total | 0 |  |  |
Liabilities: |  |  |  |
Convertible notes | 170,191 |  |  |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Assets: |  |  |  |
Cash equivalents | 0 |  |  |
Total | 0 |  |  |
Liabilities: |  |  |  |
Deferred consideration (Note 12) | 230,137 |  |  | 173,024
Total |  |  |  | 173,024
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |
Assets: |  |  |  |
AdvisorEngine Inc. – Financial interests | 0 |  |  | $ 28,172
Thesys Group, Inc. – Series Y preferred stock | 0 |  |  |
Total | $ 0 |  |  |

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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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