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Fair Value Measurements - Summary of Categorization of Assets and Liabilities Measured at Fair Value (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Liabilities: |  |
Deferred consideration (Note 12) | $ 173,024 | $ 161,540
Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Cash equivalents | 317 | 24
Securities owned, at fair value | 17,319 | 8,873
Total | 17,636 | 8,897
Liabilities: |  |
Deferred consideration (Note 12) | 173,024 | 161,540
Securities sold, but not yet purchased | 582 | 1,698
Total | 173,606 | 163,238
Fair Value, Measurements, Nonrecurring [Member] |  |
Assets: |  |
Thesys Group, Inc. – Series Y preferred stock |  | 3,080
AdvisorEngine – Financial Interests | 28,172 |
Total | 28,172 | 3,080
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Cash equivalents | 317 | 24
Securities owned, at fair value | 17,319 | 8,873
Total | 17,636 | 8,897
Liabilities: |  |
Securities sold, but not yet purchased | 582 | 1,698
Total | 582 | 1,698
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Liabilities: |  |
Deferred consideration (Note 12) | 173,024 | 161,540
Total | 173,024 | 161,540
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |
Assets: |  |
Thesys Group, Inc. – Series Y preferred stock |  | 3,080
AdvisorEngine – Financial Interests | 28,172 |
Total | $ 28,172 | $ 3,080

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