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Investments - Additional Information (Detail) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2023 USD ($) | Sep. 30, 2023 Security | Dec. 31, 2022 Security
Marketable Securities [Line Items] |  |  |
Number of available-for-sale investment securities in unrealized loss position | Security |  | 29 | 43
Proceeds from sale of available-for-sale securities | $ 183.0 |  |
Available-for-sale securities, realized gain loss | $ 0.5 |  |

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