Debt - Debt (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Total debt	$ 363,580	$ 198,669
Less current maturities	40,718	37,857
Long-term debt, less current maturities (Note 6)	322,862	160,812
Unsecured private placement 3.95% note [Member]
Debt Instrument [Line Items]
Total debt	$ 85,485	$ 99,727
Debt instrument interest rate percentage	3.95%	3.95%
Unsecured private placement 3.95% note [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Maturity Dates	2022	2022
Unsecured private placement 3.95% note [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Maturity Dates	2027	2027
Unsecured private placement 3.86% note [Member]
Debt Instrument [Line Items]
Total debt	$ 56,962	$ 71,193
Debt instrument interest rate percentage	3.86%	3.86%
Unsecured private placement 3.86% note [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Maturity Dates	2022	2022
Unsecured private placement 3.86% note [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Maturity Dates	2025	2025
Unsecured private placement 4.86% note [Member]
Debt Instrument [Line Items]
Total debt	$ 18,502	$ 27,749
Debt instrument interest rate percentage	4.86%	4.86%
Unsecured private placement 4.86% note [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Maturity Dates	2022	2022
Unsecured private placement 4.86% note [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Maturity Dates	2023	2023
Unsecured private placement 2.30% note [Member]
Debt Instrument [Line Items]
Total debt	$ 49,900
Debt instrument interest rate percentage	2.30%	2.30%
Unsecured private placement 2.30% note [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Maturity Dates	2024	2024
Unsecured private placement 2.30% note [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Maturity Dates	2028	2028
Unsecured private placement 2.37% note [Member]
Debt Instrument [Line Items]
Total debt	$ 49,892
Debt instrument interest rate percentage	2.37%	2.37%
Unsecured private placement 2.37% note [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Maturity Dates	2024	2024
Unsecured private placement 2.37% note [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Maturity Dates	2028	2028
Unsecured private placement 2.73% note [Member]
Debt Instrument [Line Items]
Total debt	$ 99,978
Debt instrument interest rate percentage	2.73%	2.73%
Unsecured private placement 2.73% note [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Maturity Dates	2025	2025
Unsecured private placement 2.73% note [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Maturity Dates	2031	2031
Debt of foreign subsidiaries Unsecured bank debt, foreign currency [Member]
Debt Instrument [Line Items]
Total debt	$ 2,861
Maturity Dates	2022	2022

Debt instruments maturity year.

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- Definition

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

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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.

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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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- Definition

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

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