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Commitments, Guarantees, Indemnifications, and Legal Proceedings - Additional Information (Details) - DeRidder, Louisiana - USD ($) | 3 Months Ended | 9 Months Ended |
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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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