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Debt - Debt (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Debt Instrument [Line Items] |  |
Total debt | $ 198,669 | $ 222,103
Less current maturities | 37,857 | 23,571
Long-term debt | 160,812 | 198,532
Unsecured private placement 3.95% note [Member] |  |
Debt Instrument [Line Items] |  |
Total debt | $ 99,727 | $ 99,684
Debt instrument interest rate percentage | 3.95% | 3.95%
Unsecured private placement 3.95% note [Member] | Minimum [Member] |  |
Debt Instrument [Line Items] |  |
Maturity Dates | 2021 | 2021
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 | $ 71,193 | $ 85,423
Debt instrument interest rate percentage | 3.86% | 3.86%
Unsecured private placement 3.86% note [Member] | Minimum [Member] |  |
Debt Instrument [Line Items] |  |
Maturity Dates | 2021 | 2021
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 | $ 27,749 | $ 36,996
Debt instrument interest rate percentage | 4.86% | 4.86%
Unsecured private placement 4.86% note [Member] | Minimum [Member] |  |
Debt Instrument [Line Items] |  |
Maturity Dates | 2021 | 2021
Unsecured private placement 4.86% note [Member] | Maximum [Member] |  |
Debt Instrument [Line Items] |  |
Maturity Dates | 2023 | 2023

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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