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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
Sep. 30, 2024
Dec. 31, 2023
Schedule Of Held To Maturity Securities [Line Items]    
Within one year, Carrying Amount $ 47,290 $ 64,129
After one year through five years, Carrying Amount 115,402 136,854
After five years through ten years, Carrying Amount 113,949 114,990
After ten years, Carrying Amount 156,835 164,270
Held-to-maturity, Carrying Amount, Totals 436,369 483,575
Within one year, Fair Value 46,978 63,703
After one year through five years, Fair Value 112,425 131,396
After five years through ten years, Fair Value 110,703 110,814
After ten years, Fair Value 157,402 163,944
Held-to-maturity, Fair Value, Totals 430,353 473,092
U.S. Agency-Based Mortgage-Backed Securities [Member]    
Schedule Of Held To Maturity Securities [Line Items]    
Without single maturity, Carrying Amount 2,877 3,297
Held-to-maturity, Carrying Amount, Totals 2,877 3,297
Without single maturity, Fair Value 2,829 3,199
Held-to-maturity, Fair Value, Totals 2,829 3,199
Asset-Backed Securities [Member]    
Schedule Of Held To Maturity Securities [Line Items]    
Without single maturity, Carrying Amount 16 35
Held-to-maturity, Carrying Amount, Totals 16 35
Without single maturity, Fair Value 16 36
Held-to-maturity, Fair Value, Totals $ 16 $ 36