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Investments - Investments in Variable Interest Entities Table Footnote (Detail) - USD ($) | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Variable Interest Entity [Line Items] |  |
Receivables from related parties | $ 8,378,000 | $ 5,237,000
Maximum Exposure to Loss | 4,300,000 | $ 4,500,000
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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