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Debt - Debt (Detail) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
Debt Instrument [Line Items] |  |
Total debt | $ 232,637 | $ 276,080
Less current maturities | 24,889 | 37,058
Long-term debt | 207,748 | 239,022
Unsecured private placement 3.95% note [Member] |  |
Debt Instrument [Line Items] |  |
Total debt | $ 99,662 | $ 99,640
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 | $ 85,395 | $ 99,653
Debt instrument interest rate percentage | 3.86% | 3.86%
Unsecured private placement 3.86% note [Member] | Minimum [Member] |  |
Debt Instrument [Line Items] |  |
Maturity Dates | 2019 | 2019
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 | $ 46,262 | $ 46,243
Debt instrument interest rate percentage | 4.86% | 4.86%
Unsecured private placement 4.86% note [Member] | Minimum [Member] |  |
Debt Instrument [Line Items] |  |
Maturity Dates | 2019 | 2019
Unsecured private placement 4.86% note [Member] | Maximum [Member] |  |
Debt Instrument [Line Items] |  |
Maturity Dates | 2023 | 2023
Unsecured private placement 5.88% note [Member] |  |
Debt Instrument [Line Items] |  |
Total debt |  | $ 22,772
Debt instrument interest rate percentage | 5.88% | 5.88%
Unsecured private placement 5.88% note [Member] | Minimum [Member] |  |
Debt Instrument [Line Items] |  |
Maturity Dates | 2019 | 2019
Unsecured private placement 5.88% note [Member] | Maximum [Member] |  |
Debt Instrument [Line Items] |  |
Maturity Dates | 2022 | 2022
Debt of foreign subsidiaries Unsecured bank debt, foreign currency [Member] |  |
Debt Instrument [Line Items] |  |
Total debt | $ 1,318 | $ 7,772
Maturity Dates | 2019 | 2019

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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=6877327&loc=d3e13212-122682 + Details
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