v3.26.3
Investments - Scheduled Contractual Maturities of Fixed-Maturity Securities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
Investments, Debt and Equity Securities [Abstract]    
Due in one year or less, Cost or Amortized Cost $ 52,655 $ 10,202
Due after one year through five years, Cost or Amortized Cost 715,685 353,454
Due after five years through ten years, Cost or Amortized Cost 501,303 209,970
Due after ten years, Cost or Amortized Cost 501 501
Commercial mortgage-backed securities Cost or Amortized Cost 24,856 21,256
Fixed-maturity securities, Cost or Amortized Cost 1,295,000 595,383
Due in one year or less, Estimated Fair Value 52,492 10,214
Due after one year through five years, Estimated Fair Value 699,051 354,648
Due after five years through ten years, Estimated Fair Value 465,323 210,963
Due after ten years, Estimated Fair Value 381 449
Commercial mortgage backed securities Estimated Fair Value 24,197 21,055
Estimated Fair Value Total [1] $ 1,241,444 $ 597,329
[1] See Note 12 for details of balances associated with consolidated variable interest entities.