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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
Dec. 31, 2024
Dec. 31, 2023
Schedule Of Held To Maturity Securities [Line Items]    
Within one year, Carrying Amount $ 49,303 $ 64,129
After one year through five years, Carrying Amount 93,087 136,854
After five years through ten years, Carrying Amount 115,307 114,990
After ten years, Carrying Amount 152,570 164,270
Held-to-maturity, Carrying Amount, Totals 413,061 483,575
Within one year, Fair Value 48,831 63,703
After one year through five years, Fair Value 89,418 131,396
After five years through ten years, Fair Value 109,812 110,814
After ten years, Fair Value 149,004 163,944
Held-to-maturity, Fair Value, Totals 399,721 473,092
U.S. Agency-Based Mortgage-Backed Securities [Member]    
Schedule Of Held To Maturity Securities [Line Items]    
Without single maturity, Carrying Amount 2,781 3,297
Held-to-maturity, Carrying Amount, Totals 2,781 3,297
Without single maturity, Fair Value 2,643 3,199
Held-to-maturity, Fair Value, Totals 2,643 3,199
Asset-Backed Securities [Member]    
Schedule Of Held To Maturity Securities [Line Items]    
Without single maturity, Carrying Amount 13 35
Held-to-maturity, Carrying Amount, Totals 13 35
Without single maturity, Fair Value 13 36
Held-to-maturity, Fair Value, Totals $ 13 $ 36