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Commitments, Guarantees, Indemnifications, and Legal Proceedings - Additional Information (Details) - DeRidder, Louisiana - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Feb. 08, 2017
Schedule Of Commitments And Contingencies [Line Items]
Loss contingency, period of occurrence	February 8, 2017
Liability insurance		$ 1.0
Property damage and business interruption losses		$ 5.0

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- Definition

Schedule of commitments and contingencies.

+ References

No definition available.

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- Definition

Amount of loss contingency liability.

+ 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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- Definition

The amount of insurance-related assessment liability that is expected to be recovered through policy surcharges applied to in-force policies.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 405
-SubTopic 30
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6392405&loc=d3e24119-109301

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States when the existing condition, situation, or set of circumstances involving uncertainty occurred.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
-Section 50
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