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The amount of retained earnings available for dividend distribution as calculated in accordance with loan covenants.

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

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

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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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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

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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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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Debt - Additional Information (Detail) - USD ($)				12 Months Ended
Debt - Additional Information (Detail) - USD ($)	Dec. 10, 2021	Sep. 23, 2021	Jun. 10, 2021	Dec. 31, 2021	Dec. 31, 2020	Jan. 30, 2018
Debt Instrument [Line Items]
Total debt				$ 363,580,000	$ 198,669,000
Line of credit facility, Minimum maturity period				1 month
Line of credit facility, maturity period				3 months
Line of credit facility, Maximum maturity period				6 months
Debt matures in 2022				$ 40,718,000
Debt matures in 2023				37,857,000
Debt matures in 2024				48,572,000
Debt matures in 2025				62,858,000
Debt matures in 2026				48,572,000
Debt matures after 2026				125,713,000
Amount of repayments of long-term debt due in next year				$ 37,857,000
Minimum [Member]
Debt Instrument [Line Items]
Commitment fee percentage				0.15%
Minimum [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Spread rate				1.25%
Minimum [Member] \| Prime Rate [Member]
Debt Instrument [Line Items]
Spread rate				0.25%
Maximum [Member]
Debt Instrument [Line Items]
Commitment fee percentage				0.325%
Maximum [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Spread rate				1.875%
Maximum [Member] \| Prime Rate [Member]
Debt Instrument [Line Items]
Spread rate				0.875%
Unsecured Private Placement Notes [Member]
Debt Instrument [Line Items]
Total debt				$ 360,719,000
Debt instrument maturity dates description				The notes had original maturities of seven to 12 years with mandatory amortization of principal beginning four, five and six years after issuance.
Unsecured Private Placement Notes [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt instrument interest rate percentage				2.30%
Maturity Dates				7 years
Unsecured Private Placement Notes [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument interest rate percentage				4.86%
Maturity Dates				12 years
Series 2021-A Notes [Member]
Debt Instrument [Line Items]
Total debt			$ 50,000,000
Debt instrument interest rate percentage			2.30%
Debt instrument, periodic payment			semi-annually
Debt Instrument, Maturity Date			Jun. 10, 2028
Series 2021-D Notes [Member]
Debt Instrument [Line Items]
Total debt	$ 50,000,000
Debt instrument interest rate percentage	2.73%
Debt instrument, periodic payment	semi-annually
Debt Instrument, Maturity Date	Dec. 10, 2031
Series 2021-B Notes [Member]
Debt Instrument [Line Items]
Total debt		$ 50,000,000
Debt instrument interest rate percentage		2.37%
Debt instrument, periodic payment		semi-annually
Debt Instrument, Maturity Date		Sep. 23, 2028
Series 2021-C Notes [Member]
Debt Instrument [Line Items]
Total debt	$ 50,000,000
Debt instrument interest rate percentage	2.73%
Debt instrument, periodic payment	semi-annually
Debt Instrument, Maturity Date	Dec. 10, 2031
Multi Currency Revolving Credit Agreement [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date				Jan. 30, 2023
Revolving credit agreement				$ 350,000,000		$ 350,000,000
Letters of Credit Outstanding				6,720,000
Outstanding borrowings				0
Unused Revolving credit				343,280,000
Unrestricted retained earnings				468,095,000	$ 373,884,000
Debt of foreign subsidiaries Unsecured bank debt and Term Loan, foreign currency [Member]
Debt Instrument [Line Items]
Total debt				$ 2,861,000