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Summary of Estimated Fair Values of Bonds Held on Deposit (Detail) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Schedule Of Available For Sale Securities [Line Items]    
Estimated Fair Value [1] $ 184,351 $ 178,342
On Deposit With Governmental Authorities    
Schedule Of Available For Sale Securities [Line Items]    
Estimated Fair Value 19,861 19,378
Held In Trust Pursuant To Third Party Requirements    
Schedule Of Available For Sale Securities [Line Items]    
Estimated Fair Value $ 164,490 $ 158,964
[1] Includes cash and cash equivalents of $25.3 million and $5.2 million at September 30, 2025 and December 31, 2024, respectively, with the remainder related to bonds available for sale.