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Summary of Amortized Cost and Estimated Fair Value Through Fixed Maturities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Schedule Of Available For Sale Securities [Line Items]    
Due in one year or less, Amortized Cost $ 652,549  
Due in one year through five years, Amortized Cost 294,500  
Due in five years through ten years, Amortized Cost 15,533  
Due after ten years, Amortized Cost 11,591  
Fixed maturities, Amortized Cost 1,334,130 $ 1,301,723
Due in one year or less, Estimated Fair value 645,791  
Due in one year through five years, Estimated Fair value 279,512  
Due in five years through ten years, Estimated Fair value 13,157  
Due after ten years, Estimated Fair value 9,799  
Fixed Maturities, estimated fair value 1,287,095 1,248,198
Mortgage Backed Securities    
Schedule Of Available For Sale Securities [Line Items]    
Amortized Cost 66,571  
Fixed maturities, Amortized Cost 66,571 67,560
Estimated Fair value 59,102  
Fixed Maturities, estimated fair value 59,102 62,116
Asset-backed Securities    
Schedule Of Available For Sale Securities [Line Items]    
Amortized Cost 208,011  
Fixed maturities, Amortized Cost 208,011 198,161
Estimated Fair value 200,974  
Fixed Maturities, estimated fair value 200,974 189,400
Commercial Mortgage-Backed Securities    
Schedule Of Available For Sale Securities [Line Items]    
Amortized Cost 85,375  
Fixed maturities, Amortized Cost 85,375 104,777
Estimated Fair value 78,760  
Fixed Maturities, estimated fair value $ 78,760 $ 98,664