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Summary of Amortized Cost and Estimated Fair Value Through Fixed Maturities (Detail) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Due in one year or less, Amortized Cost | $ 945,787 |
Due in one year through five years, Amortized Cost | 153,185 |
Due in five years through ten years, Amortized Cost | 10,807 |
Due after ten years, Amortized Cost | 9,917 |
Fixed maturities, Amortized Cost | 1,404,854 | $ 1,322,092
Due in one year or less, Estimated Fair value | 946,078 |
Due in one year through five years, Estimated Fair value | 150,427 |
Due in five years through ten years, Estimated Fair value | 10,090 |
Due after ten years, Estimated Fair value | 9,263 |
Fixed Maturities, estimated fair value | 1,395,229 | 1,293,793
Mortgage Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 49,317 |
Fixed maturities, Amortized Cost | 49,317 | 63,173
Estimated Fair value | 47,477 |
Fixed Maturities, estimated fair value | 47,477 | 58,927
Asset-backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 159,166 |
Fixed maturities, Amortized Cost | 159,166 | 207,375
Estimated Fair value | 157,668 |
Fixed Maturities, estimated fair value | 157,668 | 202,952
Commercial Mortgage-Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 76,675 |
Fixed maturities, Amortized Cost | 76,675 | 84,062
Estimated Fair value | 74,226 |
Fixed Maturities, estimated fair value | $ 74,226 | $ 79,080

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