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Debt - Debt (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |
Total debt | $ 316,746 | $ 317,013
Less current maturities | 27,848 | 28,154
Long-term debt | 288,898 | 288,859
Unsecured private placement 3.95% note [Member] |  |
Debt Instrument [Line Items] |  |
Total debt | $ 99,627 | $ 99,618
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 | $ 99,622 | $ 99,610
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 | $ 64,784 | $ 64,775
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 | $ 34,175 | $ 34,170
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 | $ 11,404 | $ 11,400
Debt instrument interest rate percentage | 5.69% | 5.69%
Unsecured private placement 5.69% note [Member] | Minimum [Member] |  |
Debt Instrument [Line Items] |  |
Maturity Dates | 2016 | 2016
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 | $ 436 | $ 432
Maturity Dates | 2017 | 2017
Debt of foreign subsidiaries Secured bank debt, foreign currency [Member] |  |
Debt Instrument [Line Items] |  |
Total debt | $ 6,698 | $ 7,008
Maturity Dates | 2017 | 2017

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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- 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/presentationRef -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=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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=6877327&loc=d3e13212-122682 + Details
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