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Variable Interest Entities - Summary of Information about Variable Interests (Detail) - USD ($) | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Carrying Amount - Assets |  |
Total net carrying value |  | $ 28,172,000
Total net carrying value | $ 880,971,000 | 935,207,000
Maximum exposure to loss | 8,112,000 | 36,284,000
Advisor Engine [Member] |  |
Carrying Amount - Assets |  |
Unsecured convertible notes receivable |  | 2,126,000
Unsecured non-convertible note receivable |  | 26,046,000
Preferred stock |  |
Total net carrying value |  | 28,172,000
Securrency Inc [Member] |  |
Carrying Amount - Assets |  |
Preferred stock | 8,112,000 | 8,112,000
Variable Interest Entity, Not Primary Beneficiary [Member] |  |
Carrying Amount - Assets |  |
Total net carrying value | $ 8,112,000 | $ 36,284,000

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