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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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Fair Value Of Securities On Deposit With Various Regulatory Authorities

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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