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Variable Interest Entities - Summary of Information about Variable Interests (Detail) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Carrying Amount - Assets |  |
Total net carrying value | $ 0 | $ 28,172,000
Total net carrying value | 896,692,000 | 935,207,000
Advisor Engine [Member] |  |
Carrying Amount - Assets |  |
Unsecured convertible notes receivable | 0 | 2,126,000
Unsecured non-convertible note receivable | 0 | 26,046,000
Preferred stock | 0 |
Total net carrying value | 0 | 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
Maximum exposure to loss | $ 8,112,000 | $ 36,284,000

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