v3.26.3
Fair Values of Financial Instruments - Summary of Carrying Amounts and Corresponding Fair Values for Financial Instruments (Detail) - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed maturity securities, fair value $ 299,849 $ 344,576
Fixed maturity securities-available-for-sale, at fair value 267,483 313,038
Equity securities 63,759 57,493
Short-term investments 58,687 14,237
Carrying Amount [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed maturity securities, fair value 323,658 350,087
Fixed maturity securities-available-for-sale, at fair value 267,483 313,038
Equity securities 63,759 57,493
Short-term investments 58,687 14,237
Cash and cash equivalents 39,678 61,926
Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed maturity securities, fair value 299,849 344,576
Fixed maturity securities-available-for-sale, at fair value 267,483 313,038
Equity securities 63,759 57,493
Short-term investments 58,687 14,237
Cash and cash equivalents $ 39,678 $ 61,926