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Summary of Estimated Fair Values of Bonds Held on Deposit (Detail) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated Fair Value | $ 181,191 | $ 148,118
On Deposit With Governmental Authorities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated Fair Value | 19,290 | 26,093
Held In Trust Pursuant To Third Party Requirements |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated Fair Value | 161,901 | 119,513
Letter Of Credit Held For Third Party Requirements |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated Fair Value | $ 0 | $ 2,512

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