Accumulated Other Comprehensive Income - Schedule of Amounts Reclassified from Accumulated Other Comprehensive Income (Losses) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Costs of products sold	$ 1,575,188us-gaap_CostOfGoodsSold	$ 1,507,108us-gaap_CostOfGoodsSold	$ 1,371,139us-gaap_CostOfGoodsSold
Selling, general and administrative	133,235	133,867	121,590
Income tax provision	18,137us-gaap_IncomeTaxExpenseBenefit	2,043us-gaap_IncomeTaxExpenseBenefit	19,562us-gaap_IncomeTaxExpenseBenefit
Reclassifications Out of Accumulated Other Comprehensive Income [Member]
Defined Benefit Plan Disclosure [Line Items]
Net of tax	10,095	15,888	10,357
Reclassifications Out of Accumulated Other Comprehensive Income [Member] \| Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Costs of products sold	2,503	2,470	2,025
Before tax	15,384	24,217	19,475
Income tax provision	(5,831)	(9,110)	(7,376)
Net of tax	9,553	15,107	12,099
Reclassifications Out of Accumulated Other Comprehensive Income [Member] \| Pension Benefits [Member] \| Prior Service Costs [Member]
Defined Benefit Plan Disclosure [Line Items]
Selling, general and administrative	830	649	430
Reclassifications Out of Accumulated Other Comprehensive Income [Member] \| Pension Benefits [Member] \| Actuarial Losses [Member]
Defined Benefit Plan Disclosure [Line Items]
Costs of products sold	8,965	16,399	13,764
Selling, general and administrative	3,086	4,699	3,256
Reclassifications Out of Accumulated Other Comprehensive Income [Member] \| Amortization of Deferred Benefit Other Plan Items [Member]
Defined Benefit Plan Disclosure [Line Items]
Costs of products sold	(237)	(384)	(760)
Before tax	114	161	(277)
Income tax provision	(43)	(61)	105
Net of tax	71	100	(172)
Reclassifications Out of Accumulated Other Comprehensive Income [Member] \| Amortization of Deferred Benefit Other Plan Items [Member] \| Prior Service Costs [Member]
Defined Benefit Plan Disclosure [Line Items]
Selling, general and administrative	(51)	(96)	(177)
Reclassifications Out of Accumulated Other Comprehensive Income [Member] \| Amortization of Deferred Benefit Other Plan Items [Member] \| Actuarial Losses [Member]
Defined Benefit Plan Disclosure [Line Items]
Costs of products sold	331	494	511
Selling, general and administrative	71	147	149
Reclassifications Out of Accumulated Other Comprehensive Income [Member] \| Cash Flow Hedges [Member] \| (Gains) Losses on Cash Flow Hedges [Member]
Defined Benefit Plan Disclosure [Line Items]
Costs of products sold	655	945	(2,183)
Income tax provision	(184)	(264)	613
Net of tax	$ 471	$ 681	$ (1,570)

Total costs related to goods produced and sold during the reporting period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 2

-Article 5

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.2(a))

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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- Definition

This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses and taxes from ongoing operations before extraordinary items, and noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 45

-Paragraph 19

-URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569616-111683

+ Details

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Balance Type:	credit
Period Type:	duration

- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(h))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph h

-Article 4

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Income Tax Expense (or Benefit)

-URI http://asc.fasb.org/extlink&oid=6515339

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 9

-Subparagraph (a),(b)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319

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Balance Type:	debit
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- Definition

Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1377-109256

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- Definition

The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.4)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 4

-Article 5

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 330

-SubTopic 10

-Section 30

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=34747878&loc=d3e3636-108311

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