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Investments - Investments in Variable Interest Entities Table Footnote (Detail) - USD ($) | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Variable Interest Entity [Line Items] |  |
Receivables from related parties | $ 6,124,000 | $ 11,915,000
Maximum exposure to loss | 4,900,000 | $ 4,800,000
Aqua |  |
Variable Interest Entity [Line Items] |  |
Receivables from related parties | 980,000 |
Subordinated Loan | Aqua |  |
Variable Interest Entity [Line Items] |  |
Receivables from related parties | 980,000 |
Maximum exposure to loss | $ 980,000 |

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