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Long-Term Debt - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Nov. 09, 2006
Debt Instrument [Line Items]
Statutory capital and surplus	$ 12,900,000
Principal repayments of Surplus Note	1,500,000	$ 1,500,000	$ 1,500,000
Surplus during the term of surplus note	50,000,000
Interest Expense	$ 300,000	$ 400,000	$ 1,000,000
Surplus Note [Member]
Debt Instrument [Line Items]
Unsecured term loan agreement				$ 25,000,000
Effective interest rate	2.31%	1.88%	2.21%
Principal repayments of Surplus Note	$ 368,000
Maturity year of debt instrument	through 2026
Net written premium to surplus ratio	200.00%
Gross written premium to surplus ratio	600.00%
Surplus Note [Member] | Hurricane [Member]
Debt Instrument [Line Items]
Surplus and Reinsurance sufficient to cover in excess of UPCIC probable maximum loss	1-in-100 year

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Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Description of the maturity date of the debt instrument including whether the debt matures serially and, if so, a brief description of the serial maturities.

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Amount of the required periodic payments applied to principal.

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Description of long-term debt arrangements, which are debt arrangements that originally require full repayment more than twelve months after issuance or greater than the normal operating cycle of the company, if longer, and disclosures pertaining to the underlying arrangements, including repayment terms, conversion features, interest rates, restrictions on assets and activities, debt covenants, and other matters important to users of the financial statements. Types of long-term debt arrangements include borrowing under notes payable, bonds payable, debentures, term loans, and other contractual obligations for payment.

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The amount of statutory capital and surplus (stockholders' equity) as of the balance sheet date using prescribed or permitted statutory accounting practices (rather than GAAP, if different) of the state or country.

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Minimum surplus amount under amended agreement.

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