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Long-term Debt - Schedule of Long-Term Debt (Detail) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023	Nov. 23, 2021
Debt Instrument [Line Items]
Total principal amount	$ 103,309	$ 104,044
Less: unamortized debt issuance costs	(1,684)	(2,038)
Total long-term debt, net	101,625	102,006
Surplus note
Debt Instrument [Line Items]
Total principal amount	3,309	4,044
5.625% Senior unsecured notes
Debt Instrument [Line Items]
Total principal amount	$ 100,000	$ 100,000
Unsecured Debt | 5.625% Senior Unsecured Notes Due 2026
Debt Instrument [Line Items]
Stated percentage	5.625%		5.625%

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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