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Summary of Estimated Fair Values of Bonds Held on Deposit (Detail) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |  |
Estimated Fair Value | [1] | $ 184,746 | $ 181,191
On Deposit With Governmental Authorities |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |
Estimated Fair Value |  | 18,721 | 19,290
Held In Trust Pursuant To Third Party Requirements |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |
Estimated Fair Value |  | $ 166,025 | $ 161,901
[1] | Includes cash and cash equivalents of $10.4 million and $3.7 million at September 30, 2023 and December 31, 2022, respectively, with the remainder related to bonds available for sale.

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