Percentage points added to the reference rate to compute the variable rate on the debt instrument.

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

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

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+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

+ Details

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- Definition

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.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

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

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Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of the original debt instrument that was repurchased.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

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.

+ References

No definition available.

+ Details

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Data Type:	xbrli:durationItemType
Balance Type:	na
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- Definition

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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Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

No definition available.

+ Details

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- Definition

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.

+ References

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Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

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Balance Type:	debit
Period Type:	duration

- Details

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Long-term Debt - Additional Information (Detail) - USD ($)			1 Months Ended	3 Months Ended
	Oct. 31, 2022	Nov. 23, 2021	Aug. 31, 2021	Mar. 31, 2023	Dec. 31, 2006
Revolving Credit Facility \| Prime Rate
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	2.00%
2021 Revolving Loan \| Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity				$ 35,000,000
Line of credit facility, expiration period			364 days
Borrowings on line of credit facility				0
2022 Revolving Loan \| Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 37,500,000
Line of credit facility, unused capacity, commitment fee percentage	0.50%
Line of credit facility, expiration period	364 days
Borrowings on line of credit facility				$ 0
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
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 \| Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Redemption price		102.8125%
Unsecured Debt \| 5.625% Senior Unsecured Notes Due 2026 \| Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Redemption price		101.40625%
Unsecured Debt \| 5.625% Senior Unsecured Notes Due 2026 \| Debt Instrument, Redemption, Period Three
Debt Instrument [Line Items]
Redemption price		100.00%