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Commitments and Contingencies - Schedule of Environmental Liability Associated with Potsdam (Detail) - Potsdam Environmental Remediation Liability [Member] - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Site Contingency [Line Items]
Beginning balance	$ 5,142	$ 5,421
Revisions in estimates		(118)
Obligations settled		(298)
Ending balance	5,201	5,108
Accretion Expense [Member]
Site Contingency [Line Items]
Accretion expense	$ 59	$ 103

X

- Definition

Total costs accrued as of the balance sheet date for environmental loss contingencies.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 450



-SubTopic 20



-Section 50



-Paragraph 1



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-Name Accounting Standards Codification



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X

- Definition

The Increase or Decrease in the accrual for environmental loss in the period from revisions in estimates to existing obligations. The amount does not relate to changes in the environmental accrual related to business acquisitions or divestitures, or to currency movements.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 450



-SubTopic 20



-Section S99



-Paragraph 1



-Subparagraph (SAB TOPIC 5.Y.Q2)



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- Definition

The aggregate amount disbursed during the reporting period to settle environmental loss contingencies.

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-Publisher FASB



-Name Accounting Standards Codification



-Topic 450



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- Definition

The amount added to the accrual for newly incurred environmental loss contingencies. These additions include remediation expense and interest accretion. These additions do not relate to changes in the environmental accrual related to a business acquisition or divestiture, to currency movements, or revisions in previously existing estimates.

+ References

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



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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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