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Fair Value Measurements - Summary of Categorization of Assets and Liabilities Measured at Fair Value (Detail) - USD ($) $ in Thousands | Jun. 30, 2021 | Mar. 08, 2021 | Dec. 31, 2020 | Aug. 13, 2020 | Jun. 16, 2020
--- | --- | --- | --- | --- | ---
Assets: |  |  |  |  |
Securities owned, at fair value | $ 58,806 |  | $ 34,895 |  |
Liabilities: |  |  |  |  |
Deferred consideration (Note 9) | 226,706 |  | 230,137 |  |
Fair Value, Measurements, Recurring [Member] |  |  |  |  |
Assets: |  |  |  |  |
Cash equivalents | 81,536 |  | 660 |  |
Total | 140,342 |  | 35,555 |  |
Liabilities: |  |  |  |  |
Deferred consideration (Note 9) | 226,706 |  | 230,137 |  |
Fair Value, Measurements, Recurring [Member] | Exchange Traded Funds [Member] |  |  |  |  |
Assets: |  |  |  |  |
Securities owned, at fair value | 21,623 |  | 24,165 |  |
Fair Value, Measurements, Recurring [Member] | Federal Agency [Member] |  |  |  |  |
Assets: |  |  |  |  |
Securities owned, at fair value | 35,033 |  | 8,613 |  |
Fair Value, Measurements, Recurring [Member] | All Other Corporate Bonds [Member] |  |  |  |  |
Assets: |  |  |  |  |
Securities owned, at fair value | 2,150 |  | 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] | Securrency - Series A convertible preferred stock |  |  |  |  |
Assets: |  |  |  |  |
Investment owned, at fair value |  | $ 8,488 |  |  |
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |  |
Assets: |  |  |  |  |
Cash equivalents | 81,536 |  | 660 |  |
Total | 118,140 |  | 24,825 |  |
Liabilities: |  |  |  |  |
Deferred consideration (Note 9) |  |  | 0 |  |
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Exchange Traded Funds [Member] |  |  |  |  |
Assets: |  |  |  |  |
Securities owned, at fair value | 21,623 |  | 24,165 |  |
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Federal Agency [Member] |  |  |  |  |
Assets: |  |  |  |  |
Securities owned, at fair value | 14,981 |  |  |  |
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 | 22,202 |  | 10,730 |  |
Liabilities: |  |  |  |  |
Deferred consideration (Note 9) |  |  | 0 |  |
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Federal Agency [Member] |  |  |  |  |
Assets: |  |  |  |  |
Securities owned, at fair value | 20,052 |  | 8,613 |  |
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | All Other Corporate Bonds [Member] |  |  |  |  |
Assets: |  |  |  |  |
Securities owned, at fair value | 2,150 |  | 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 9) | 226,706 |  | 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] | Securrency - Series A convertible preferred stock |  |  |  |  |
Assets: |  |  |  |  |
Investment owned, at fair value | $ 8,488 |  |  |  |

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