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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

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