Debt - Debt (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
Mar. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Total debt	$ 283,736us-gaap_LongTermDebt	$ 273,931us-gaap_LongTermDebt
Less current maturities	27,799us-gaap_LongTermDebtCurrent	27,034us-gaap_LongTermDebtCurrent
Long-term debt	255,937us-gaap_LongTermDebtNoncurrent	246,897us-gaap_LongTermDebtNoncurrent
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%
Maturity Dates	2019-2025	2019-2025
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%
Maturity Dates	2017-2023	2017-2023
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%
Maturity Dates	2016-2022	2016-2022
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%
Maturity Dates	2015-2018	2015-2018
Unsecured private placement 6.86% note [Member]
Debt Instrument [Line Items]
Total debt	4,284	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	30,000	20,000
Maturity Dates	2019	2019
Debt of foreign subsidiaries Unsecured bank debt, foreign currency [Member]
Debt Instrument [Line Items]
Total debt	14,388	12,043
Maturity Dates	2015	2015
Debt of foreign subsidiaries Unsecured bank term loan, foreign currency [Member]
Debt Instrument [Line Items]
Total debt	4,139	4,840
Maturity Dates	2021	2021
Debt of foreign subsidiaries Secured bank term loan, foreign currency [Member]
Debt Instrument [Line Items]
Total debt	537	2,723
Maturity Dates	2015	2015
Debt of foreign subsidiaries Secured bank debt, foreign currency [Member]
Debt Instrument [Line Items]
Total debt	1,985	1,638
Maturity Dates	2015	2015
Debt of foreign subsidiaries Unsecured bank debt, U.S dollars [Member]
Debt Instrument [Line Items]
Total debt	$ 546	$ 546
Maturity Dates	2015	2015

Debt instruments maturity period.

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- Definition

Debt instruments maturity year.

+ References

No definition available.

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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 SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: 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

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. 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 SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 7

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef

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-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

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- Definition

Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. 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 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19,20)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). 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 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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