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Debt - Debt (Detail) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 | Dec. 31, 2014
Debt Instrument [Line Items] |  |
Total debt | $ 341,453 | $ 273,931
Less current maturities | 21,671 | 27,034
Long-term debt | 319,782 | $ 246,897
Unsecured private placement 3.95% note [Member] |  |
Debt Instrument [Line Items] |  |
Total debt | $ 100,000 |
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 | $ 100,000 | $ 100,000
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 | $ 65,000 | $ 65,000
Debt instrument interest rate percentage | 4.86% | 4.86%
Unsecured private placement 4.86% note [Member] | Minimum [Member] |  |
Debt Instrument [Line Items] |  |
Maturity Dates | 2017 | 2017
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 | $ 40,000 | $ 40,000
Debt instrument interest rate percentage | 5.88% | 5.88%
Unsecured private placement 5.88% note [Member] | Minimum [Member] |  |
Debt Instrument [Line Items] |  |
Maturity Dates | 2016 | 2016
Unsecured private placement 5.88% note [Member] | Maximum [Member] |  |
Debt Instrument [Line Items] |  |
Maturity Dates | 2022 | 2022
Unsecured private placement 5.69% note [Member] |  |
Debt Instrument [Line Items] |  |
Total debt | $ 22,857 | $ 22,857
Debt instrument interest rate percentage | 5.69% | 5.69%
Unsecured private placement 5.69% note [Member] | Minimum [Member] |  |
Debt Instrument [Line Items] |  |
Maturity Dates | 2015 | 2015
Unsecured private placement 5.69% note [Member] | Maximum [Member] |  |
Debt Instrument [Line Items] |  |
Maturity Dates | 2018 | 2018
Unsecured private placement 6.86% note [Member] |  |
Debt Instrument [Line Items] |  |
Total debt |  | $ 4,284
Debt instrument interest rate percentage | 6.86% | 6.86%
Maturity Dates | 2015 | 2015
Unsecured U.S. bank debt [Member] |  |
Debt Instrument [Line Items] |  |
Total debt |  | $ 20,000
Maturity Dates | 2019 | 2019
Debt of foreign subsidiaries Unsecured bank debt, foreign currency [Member] |  |
Debt Instrument [Line Items] |  |
Total debt | $ 7,892 | $ 12,043
Maturity Dates | 2015 | 2015
Debt of foreign subsidiaries Unsecured bank term loan, foreign currency [Member] |  |
Debt Instrument [Line Items] |  |
Total debt | $ 3,993 | $ 4,840
Maturity Dates | 2021 | 2021
Debt of foreign subsidiaries Secured bank term loan, foreign currency [Member] |  |
Debt Instrument [Line Items] |  |
Total debt |  | $ 2,723
Maturity Dates | 2015 | 2015
Debt of foreign subsidiaries Secured bank debt, foreign currency [Member] |  |
Debt Instrument [Line Items] |  |
Total debt | $ 1,211 | $ 1,638
Maturity Dates | 2015 | 2015
Debt of foreign subsidiaries Unsecured bank debt, U.S dollars [Member] |  |
Debt Instrument [Line Items] |  |
Total debt | $ 500 | $ 546
Maturity Dates | 2015 | 2015

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