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Long-term Debt - Schedule of Long-Term Debt (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Total principal amount	$ 103,676	$ 104,044
Less: unamortized debt issuance costs	(1,861)	(2,038)
Total long-term debt, net	101,815	102,006
Surplus note
Debt Instrument [Line Items]
Total principal amount	3,676	4,044
5.625% Senior unsecured notes
Debt Instrument [Line Items]
Total principal amount	$ 100,000	$ 100,000

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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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