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Summary of Estimated Fair Values of Bonds Held on Deposit (Parenthetical) (Detail) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-Sale [Line Items] |  |
Cash and cash equivalents | $ 38,857 | $ 38,037
Remainder Related to Bonds Available for Sale |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Cash and cash equivalents | $ 9,900 | $ 9,000

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