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Summary of Estimated Fair Values of Bonds Held on Deposit (Detail) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Schedule Of Available For Sale Securities [Line Items]    
Estimated Fair Value [1] $ 184,746 $ 181,191
On Deposit With Governmental Authorities    
Schedule Of Available For Sale Securities [Line Items]    
Estimated Fair Value 18,721 19,290
Held In Trust Pursuant To Third Party Requirements    
Schedule Of Available For Sale Securities [Line Items]    
Estimated Fair Value $ 166,025 $ 161,901
[1] Includes cash and cash equivalents of $10.4 million and $3.7 million at September 30, 2023 and December 31, 2022, respectively, with the remainder related to bonds available for sale.