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Summary of Estimated Fair Values of Bonds Held on Deposit (Detail) - USD ($) $ in Thousands		Mar. 31, 2023	Dec. 31, 2022
Schedule Of Available For Sale Securities [Line Items]
Estimated Fair Value	[1]	$ 183,905	$ 181,191
On Deposit With Governmental Authorities
Schedule Of Available For Sale Securities [Line Items]
Estimated Fair Value		19,476	19,290
Held In Trust Pursuant To Third Party Requirements
Schedule Of Available For Sale Securities [Line Items]
Estimated Fair Value		$ 164,429	$ 161,901
[1] Includes cash and cash equivalents of $4.1 million and $3.7 million at March 31, 2023 and December 31, 2022, respectively, with the remainder related to bonds available for sale.

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