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Long-term Debt - Additional Information (Detail)		1 Months Ended
	Nov. 23, 2021 USD ($) d	Aug. 31, 2021 USD ($)	Mar. 31, 2022	Dec. 31, 2006 USD ($)
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%
Maturity year of debt instrument	2026
Debt instrument, convertible, threshold percentage of stock price trigger	0.25%
Debt instrument, convertible, threshold trading days | d	120
Debt instrument, convertible, threshold consecutive trading days | d	90
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%
Unsecured Debt | 5.625% Senior Unsecured Notes Due 2026 Member | Maximum
Debt Instrument [Line Items]
Debt instrument, convertible, threshold percentage of stock price trigger	0.50%

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

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Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instrument must exceed threshold percentage for specified number of trading days to trigger conversion feature.

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Minimum percentage of common stock price to conversion price of convertible debt instruments to determine eligibility of conversion.

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Threshold number of specified trading days that common stock price to conversion price of convertible debt instruments must exceed threshold percentage within a specified consecutive trading period to trigger conversion feature.

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- Definition

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

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- 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.

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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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