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v3.23.1

Investments - Additional Information (Detail) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2022
Schedule of Investments [Line Items] |  |  |
Available-for-sale debt securities, allowance for credit losses | $ 0 |  | $ 0
Purchase an available-for-sale debt securities with credit deterioration | 0 |  |
Asset impairments | $ 0 | $ 0 |
Investment [Member] | Issuer Concentration [Member] | Market Value of Total Investment Portfolio [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Investment concentration risk percentage | 5.00% |  |

X
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