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Summary of Estimated Fair Values of Bonds Held on Deposit (Detail) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Schedule Of Available For Sale Securities [Line Items]    
Estimated Fair Value [1] $ 173,669 $ 170,058
On Deposit With Governmental Authorities    
Schedule Of Available For Sale Securities [Line Items]    
Estimated Fair Value 19,102 19,262
Held In Trust Pursuant To Third Party Requirements    
Schedule Of Available For Sale Securities [Line Items]    
Estimated Fair Value $ 154,567 $ 150,796
[1] Includes cash and cash equivalents of $10.7 million and $9.0 million at June 30, 2024 and December 31, 2023, respectively, with the remainder related to bonds available for sale.