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v3.22.2.2

Investments - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2022 | Sep. 30, 2021
Schedule of Investments [Line Items] |  |  |
Available-for-sale debt securities, allowance for credit losses | $ 0 | $ 0 | $ 0
Purchase an available-for-sale debt securities with credit deterioration |  | 0 |
Asset impairments | $ 16,969,000 | $ 16,969,000 |
Investment [Member] | Issuer Concentration [Member] | Market Value of Total Investment Portfolio [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Investment concentration risk percentage |  | 5.00% |

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