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Fair Value Measurements - Summary of Categorization of Assets and Liabilities Measured at Fair Value (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Apr. 11, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Liabilities: |  |  |
Deferred consideration | $ 156,055 | $ 172,746 |
Fair Value, Measurements, Recurring [Member] |  |  |
Assets: |  |  |
Cash equivalents | 5,722 |  | $ 26,548
Securities owned, at fair value | 4,426 |  | 66,294
Total | 10,148 |  | 92,842
Liabilities: |  |  |
Deferred consideration | 156,055 |  |
Securities sold, but not yet purchased | 2,018 |  | 950
Total | 158,073 |  | 950
Fair Value, Measurements, Nonrecurring [Member] |  |  |
Assets: |  |  |
AdvisorEngine Inc. - Option | 3,278 |  | 3,278
Thesys Group, Inc. - Series Y preferred stock | 6,909 |  | 6,909
Total | 10,187 |  | 10,187
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets: |  |  |
Cash equivalents | 5,722 |  | 26,548
Securities owned, at fair value | 4,426 |  | 1,691
Total | 10,148 |  | 28,239
Liabilities: |  |  |
Securities sold, but not yet purchased | 2,018 |  | 950
Total | 2,018 |  | 950
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets: |  |  |
Securities owned, at fair value |  |  | 64,603
Total |  |  | 64,603
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Liabilities: |  |  |
Deferred consideration | 156,055 |  |
Total | 156,055 |  |
Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |
Assets: |  |  |
AdvisorEngine Inc. - Option | 3,278 |  | 3,278
Thesys Group, Inc. - Series Y preferred stock | 6,909 |  | 6,909
Total | $ 10,187 |  | $ 10,187

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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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