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Note Receivables - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 29, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest rate | 5.00% |  |  |
Percentage of interest rate increase at the event of default | 10.00% |  |  |
Promissory note maturity date | Dec. 29, 2021 |  |  |
Interest income recognized | $ 416 |  |  |
AdvisorEngine [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Aggregate commitment amount |  |  |  | $ 30,000
Current funding amount |  |  |  | 22,000
Remaining commitment amount | 8,000 |  |  |
AdvisorEngine [Member] | Equity Option [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Aggregate commitment amount |  |  |  | 30,000
Fair value of option | $ 3,278 |  |  | $ 3,278
AdvisorEngine [Member] | Scenario, Forecast [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Remaining commitment amount |  | $ 3,000 | $ 5,000 |

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