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Summary of Amortized Cost and Estimated Fair Value Through Fixed Maturities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Schedule Of Available For Sale Securities [Line Items]    
Due in one year or less, Amortized Cost $ 828,600  
Due in one year through five years, Amortized Cost 196,138  
Due in five years through ten years, Amortized Cost 11,812  
Due after ten years, Amortized Cost 11,375  
Fixed maturities, Amortized Cost 1,362,384 $ 1,322,092
Due in one year or less, Estimated Fair value 826,276  
Due in one year through five years, Estimated Fair value 189,204  
Due in five years through ten years, Estimated Fair value 10,491  
Due after ten years, Estimated Fair value 10,333  
Fixed Maturities, estimated fair value 1,340,046 1,293,793
Mortgage Backed Securities    
Schedule Of Available For Sale Securities [Line Items]    
Amortized Cost 58,825  
Fixed maturities, Amortized Cost 58,825 63,173
Estimated Fair value 55,363  
Fixed Maturities, estimated fair value 55,363 58,927
Asset-backed Securities    
Schedule Of Available For Sale Securities [Line Items]    
Amortized Cost 178,730  
Fixed maturities, Amortized Cost 178,730 207,375
Estimated Fair value 175,618  
Fixed Maturities, estimated fair value 175,618 202,952
Commercial Mortgage-Backed Securities    
Schedule Of Available For Sale Securities [Line Items]    
Amortized Cost 76,904  
Fixed maturities, Amortized Cost 76,904 84,062
Estimated Fair value 72,761  
Fixed Maturities, estimated fair value $ 72,761 $ 79,080