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Fair Value Measurements - Summary of Categorization of Assets and Liabilities Measured at Fair Value (Detail) - USD ($) $ in Thousands | Mar. 31, 2021 | Mar. 08, 2021 | Dec. 31, 2020 | Aug. 13, 2020 | Jun. 16, 2020
--- | --- | --- | --- | --- | ---
Assets: |  |  |  |  |
Securities owned, at fair value | $ 34,771 |  | $ 34,895 |  |
Liabilities: |  |  |  |  |
Deferred consideration (Note 12) | 227,146 |  | 230,137 |  |
Fair Value, Measurements, Recurring [Member] |  |  |  |  |
Assets: |  |  |  |  |
Cash equivalents | 502 |  | 660 |  |
Total | 35,273 |  | 35,555 |  |
Liabilities: |  |  |  |  |
Deferred consideration (Note 12) | 227,146 |  | 230,137 |  |
Fair Value, Measurements, Recurring [Member] | Exchange Traded Funds [Member] |  |  |  |  |
Assets: |  |  |  |  |
Securities owned, at fair value | 23,862 |  | 24,165 |  |
Fair Value, Measurements, Recurring [Member] | Federal Agency [Member] |  |  |  |  |
Assets: |  |  |  |  |
Securities owned, at fair value | 8,832 |  | 8,613 |  |
Fair Value, Measurements, Recurring [Member] | All Other Corporate Bonds [Member] |  |  |  |  |
Assets: |  |  |  |  |
Securities owned, at fair value | 2,077 |  | 2,117 |  |
Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |
Assets: |  |  |  |  |
AdvisorEngine Inc. – Financial interests |  |  | 0 |  |
Investment owned, at fair value |  |  | 0 |  |
Total |  |  | 0 |  |
Liabilities: |  |  |  |  |
Convertible notes |  |  | 170,191 | $ 24,344 | $ 145,847
Fair Value, Measurements, Nonrecurring [Member] | Series A convertible preferred stock [Member] |  |  |  |  |
Assets: |  |  |  |  |
Investment owned, at fair value | 8,349 | $ 8,349 |  |  |
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |  |
Assets: |  |  |  |  |
Cash equivalents | 502 |  | 660 |  |
Total | 24,364 |  | 24,825 |  |
Liabilities: |  |  |  |  |
Deferred consideration (Note 12) |  |  | 0 |  |
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Exchange Traded Funds [Member] |  |  |  |  |
Assets: |  |  |  |  |
Securities owned, at fair value | 23,862 |  | 24,165 |  |
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |
Assets: |  |  |  |  |
AdvisorEngine Inc. – Financial interests |  |  | 0 |  |
Investment owned, at fair value |  |  | 0 |  |
Total |  |  | 0 |  |
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |  |
Assets: |  |  |  |  |
Total | 10,909 |  | 10,730 |  |
Liabilities: |  |  |  |  |
Deferred consideration (Note 12) |  |  | 0 |  |
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Federal Agency [Member] |  |  |  |  |
Assets: |  |  |  |  |
Securities owned, at fair value | 8,832 |  | 8,613 |  |
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | All Other Corporate Bonds [Member] |  |  |  |  |
Assets: |  |  |  |  |
Securities owned, at fair value | 2,077 |  | 2,117 |  |
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |
Assets: |  |  |  |  |
AdvisorEngine Inc. – Financial interests |  |  | 0 |  |
Investment owned, at fair value |  |  | 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) | 227,146 |  | 230,137 |  |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |
Assets: |  |  |  |  |
AdvisorEngine Inc. – Financial interests |  |  | 0 |  |
Investment owned, at fair value |  |  | 0 |  |
Total |  |  | $ 0 |  |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Series A convertible preferred stock [Member] |  |  |  |  |
Assets: |  |  |  |  |
Investment owned, at fair value | $ 8,349 |  |  |  |

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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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