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Commitments, Guarantees, Indemnifications, and Legal Proceedings - Additional Information (Details) - DeRidder, Louisiana - USD ($)	3 Months Ended	6 Months Ended
	Mar. 31, 2018	Jun. 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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Schedule of commitments and contingencies.

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Amount of loss contingency liability.

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

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