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Summary of Amortized Cost and Estimated Fair Value Through Fixed Maturities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Schedule Of Available For Sale Securities [Line Items]    
Due in one year or less, Amortized Cost $ 489,914  
Due in one year through five years, Amortized Cost 428,150  
Due in five years through ten years, Amortized Cost 17,529  
Due after fifteen years, Amortized Cost 12,480  
Fixed maturities, Amortized Cost 1,311,567 $ 1,301,723
Due in one year or less, Estimated Fair value 483,894  
Due in one year through five years, Estimated Fair value 410,281  
Due in five years through ten years, Estimated Fair value 15,287  
Due after fifteen years, Estimated Fair value 10,709  
Fixed Maturities, estimated fair value 1,265,606 1,248,198
Mortgage Backed Securities    
Schedule Of Available For Sale Securities [Line Items]    
Amortized Cost 65,086  
Fixed maturities, Amortized Cost 65,086 67,560
Estimated Fair value 60,666  
Fixed Maturities, estimated fair value 60,666 62,116
Asset-backed Securities    
Schedule Of Available For Sale Securities [Line Items]    
Amortized Cost 212,095  
Fixed maturities, Amortized Cost 212,095 198,161
Estimated Fair value 204,315  
Fixed Maturities, estimated fair value 204,315 189,400
Commercial Mortgage-Backed Securities    
Schedule Of Available For Sale Securities [Line Items]    
Amortized Cost 86,313  
Fixed maturities, Amortized Cost 86,313 104,777
Estimated Fair value 80,454  
Fixed Maturities, estimated fair value $ 80,454 $ 98,664