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Debt - Debt (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Debt Instrument [Line Items] |  |  |  |
Total debt |  | $ 317,013 | $ 331,354 | [1]
Less current maturities |  | 28,154 | 18,806 | [1]
Long-term debt | [2] | 288,859 | 312,548 | [1]
Unsecured private placement 3.95% note [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt |  | $ 99,618 | $ 99,617 | [1]
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 |  | $ 99,610 | $ 99,560 | [1]
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 |  | $ 64,775 | $ 64,740 | [1]
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 |  | $ 34,170 | $ 39,860 | [1]
Debt instrument interest rate percentage |  | 5.88% | 5.88% |
Unsecured private placement 5.88% note [Member] | Minimum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maturity Dates |  | 2017 | 2017 |
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 |  | $ 11,400 | $ 17,096 | [1]
Debt instrument interest rate percentage |  | 5.69% | 5.69% |
Unsecured private placement 5.69% note [Member] | Minimum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maturity Dates |  | 2017 | 2017 |
Unsecured private placement 5.69% note [Member] | Maximum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maturity Dates |  | 2018 | 2018 |
Debt of foreign subsidiaries Unsecured bank debt, foreign currency [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt |  | $ 432 | $ 4,810 | [1]
Maturity Dates |  | 2017 | 2017 |
Debt of foreign subsidiaries Unsecured bank term loan, foreign currency [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt | [1] |  | $ 3,724 |
Maturity Dates |  | 2021 | 2021 |
Debt of foreign subsidiaries Secured bank debt, foreign currency [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt |  | $ 7,008 | $ 1,947 | [1]
Maturity Dates |  | 2017 | 2017 |
[1] | Certain balances have been reclassified from those originally presented at December 31, 2015, due to the Company’s January 1, 2016, adoption of the new U.S. GAAP guidance regarding the classification of debt issuance costs. See Note 1 for additional information regarding ASU No. 2015-3.
[2] | The 2015 amounts have been changed from the amounts originally reported at December 31, 2015, due to the Company’s January 1, 2016, adoption of the new U.S. accounting guidance regarding the classification of debt issuance costs. See Note 1 to the consolidated financial statements for additional information regarding Accounting Standards Update No. 2015-3.

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