v3.26.1
Summary of Amortized Cost and Estimated Fair Value Through Fixed Maturities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Schedule Of Available For Sale Securities [Line Items]    
Due in one year or less, Amortized Cost $ 729,862  
Due in one year through five years, Amortized Cost 50,325  
Due in five years through ten years, Amortized Cost 1,988  
Due after ten years, Amortized Cost 8,919  
Fixed maturities, Amortized Cost 1,295,106 $ 1,330,310
Due in one year or less, Estimated Fair value 729,949  
Due in one year through five years, Estimated Fair value 49,429  
Due in five years through ten years, Estimated Fair value 1,852  
Due after ten years, Estimated Fair value 8,376  
Fixed Maturities, estimated fair value 1,286,724 1,325,502
Mortgage Backed Securities    
Schedule Of Available For Sale Securities [Line Items]    
Amortized Cost 219,577  
Fixed maturities, Amortized Cost 219,577 199,901
Estimated Fair value 217,149  
Fixed Maturities, estimated fair value 217,149 199,060
Asset-backed Securities    
Schedule Of Available For Sale Securities [Line Items]    
Amortized Cost 204,124  
Fixed maturities, Amortized Cost 204,124 139,690
Estimated Fair value 200,665  
Fixed Maturities, estimated fair value 200,665 137,268
Commercial Mortgage-Backed Securities    
Schedule Of Available For Sale Securities [Line Items]    
Amortized Cost 80,311  
Fixed maturities, Amortized Cost 80,311 58,202
Estimated Fair value 79,304  
Fixed Maturities, estimated fair value $ 79,304 $ 56,828