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Investments - Summary of Carrying Amounts and Fair Value of Investments in Fixed Maturity Securities, Classified as Held-to-Maturity (Detail) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Schedule Of Held To Maturity Securities [Line Items] |  |
Within one year, Carrying Amount | $ 41,420 | $ 41,878
After one year through five years, Carrying Amount | 158,329 | 165,216
After five years through ten years, Carrying Amount | 125,395 | 121,739
After ten years, Carrying Amount | 147,706 | 159,093
Held-to-maturity, Carrying Amount, Totals | 476,401 | 491,688
Within one year, Fair Value | 41,148 | 41,652
After one year through five years, Fair Value | 151,287 | 159,006
After five years through ten years, Fair Value | 117,523 | 112,665
After ten years, Fair Value | 142,240 | 151,178
Held-to-maturity, Fair Value, Totals | 455,613 | 468,144
U.S. Agency-Based Mortgage-Backed Securities [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
Without single maturity, Carrying Amount | 3,499 | 3,696
Held-to-maturity, Carrying Amount, Totals | 3,499 | 3,696
Without single maturity, Fair Value | 3,364 | 3,576
Held-to-maturity, Fair Value, Totals | 3,364 | 3,576
Asset-Backed Securities [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
Without single maturity, Carrying Amount | 52 | 66
Held-to-maturity, Carrying Amount, Totals | 52 | 66
Without single maturity, Fair Value | 51 | 67
Held-to-maturity, Fair Value, Totals | $ 51 | $ 67

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