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Long-Term Debt - Schedule of Long-Term Debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Total principal amount	$ 106,985	$ 8,456
Less: unamortized debt issuance costs	(3,309)	0
Total long-term debt maturities, net	103,676	8,456
Surplus note
Debt Instrument [Line Items]
Total principal amount	6,985	8,456
5.625% Senior unsecured notes
Debt Instrument [Line Items]
Total principal amount	$ 100,000	$ 0

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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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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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