Accounts Payable and Other Liabilities - Schedule of Accounts Payable and Other Liabilities (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Other Liabilities Disclosure [Abstract]
Deferred reinsurance ceding commission	$ 38,529	$ 40,406
Accounts payable and other payables	8,616	10,086
Accrued interest and issuance costs	831	735
Accrued dividends	1,626	1,634
Premium tax		871
Other liabilities	110	195
Commission payables	16,909	17,598
Total other liabilities	$ 66,621	$ 71,525