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Commitments, Guarantees, Indemnifications, and Legal Proceedings - Additional Information (Details) - DeRidder, Louisiana - USD ($)	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2018	Feb. 08, 2017
Schedule Of Commitments And Contingencies [Line Items]
Loss contingency, period of occurrence			February 8, 2017
Liability insurance				$ 1,000,000
Property damages and business interruption insurance				$ 5,000,000
Claim with insurance carrier		$ 17,000,000
Insurance proceeds included in net cash provided by operating activities		14,500,000
Insurance proceeds included in net cash provided by investing activities		$ 2,500,000
Payment of penalties	$ 40,000

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