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Long-term Debt - Additional Information (Detail) - USD ($)		1 Months Ended
	Nov. 23, 2021	Aug. 31, 2021	Jun. 30, 2022	Dec. 31, 2006
Credit Agreement
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		$ 35,000,000
Line of credit facility, unused capacity, commitment fee percentage		0.50%
Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, expiration period		364 days
Prime Rate | Credit Agreement
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate		2.00%
Surplus note
Debt Instrument [Line Items]
Unsecured term loan agreement				$ 25,000,000
Note term				20 years
Unsecured Debt
Debt Instrument [Line Items]
Repurchased amount	$ 100,000,000
Unsecured Debt | 5.625% Senior Unsecured Notes Due 2026 Member
Debt Instrument [Line Items]
Unsecured term loan agreement	$ 100,000,000
Stated percentage	5.625%		5.625%
Maturity year of debt instrument	2026
Unsecured Debt | 5.625% Senior Unsecured Notes Due 2026 Member | Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Redemption price	102.8125%
Unsecured Debt | 5.625% Senior Unsecured Notes Due 2026 Member | Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Redemption price	101.40625%
Unsecured Debt | 5.625% Senior Unsecured Notes Due 2026 Member | Debt Instrument, Redemption, Period Three
Debt Instrument [Line Items]
Redemption price	100.00%

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

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Contractual interest rate for funds borrowed, under the debt agreement.

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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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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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Period between issuance and maturity of long-term debt, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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