v3.25.2
Summary of Amortized Cost and Estimated Fair Value Through Fixed Maturities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Schedule Of Available For Sale Securities [Line Items]    
Due in one year or less, Amortized Cost $ 619,568  
Due in one year through five years, Amortized Cost 265,534  
Due in five years through ten years, Amortized Cost 6,193  
Due after ten years, Amortized Cost 9,829  
Fixed maturities, Amortized Cost 1,341,934 $ 1,394,639
Due in one year or less, Estimated Fair value 619,117  
Due in one year through five years, Estimated Fair value 264,967  
Due in five years through ten years, Estimated Fair value 5,763  
Due after ten years, Estimated Fair value 9,174  
Fixed Maturities, estimated fair value 1,336,344 1,381,908
Mortgage Backed Securities    
Schedule Of Available For Sale Securities [Line Items]    
Amortized Cost 216,275  
Fixed maturities, Amortized Cost 216,275 61,905
Estimated Fair value 214,991  
Fixed Maturities, estimated fair value 214,991 58,920
Asset-backed Securities    
Schedule Of Available For Sale Securities [Line Items]    
Amortized Cost 158,153  
Fixed maturities, Amortized Cost 158,153 137,445
Estimated Fair value 157,128  
Fixed Maturities, estimated fair value 157,128 135,427
Commercial Mortgage-Backed Securities    
Schedule Of Available For Sale Securities [Line Items]    
Amortized Cost 66,382  
Fixed maturities, Amortized Cost 66,382 68,041
Estimated Fair value 65,204  
Fixed Maturities, estimated fair value $ 65,204 $ 65,568