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Commitments, Guarantees, Indemnifications, and Legal Proceedings - Additional Information (Details) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) a | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 13, 2017 USD ($) | Feb. 08, 2017 USD ($)
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Capital commitments |  |  | $ 112,800,000 |  |  | $ 281,300,000 |
Area leased under timberland cutting rights (acres) | a |  |  | 75,000 |  |  |  |
Average lease renewal term |  |  | 6 years |  |  |  |
Total lease expense |  |  | $ 115,100,000 | $ 100,600,000 | $ 88,300,000 |  |
Sublease rental income |  |  | 0 | 0 |  |  |
Capital lease obligations |  |  | 19,000,000 |  |  | $ 20,300,000 |
Interest paid, capital lease obligations |  |  | 1,300,000 | 1,400,000 | 1,500,000 |  |
Purchases during period under purchase agreements |  |  | 341,900,000 | 339,100,000 | $ 362,000,000 |  |
Environmental reserve |  |  | 27,300,000 |  |  |  |
Environmental liabilities and asset retirement obligations |  |  | $ 5,000,000 | $ 4,000,000 |  |  |
DeRidder, Louisiana |  |  |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Loss contingency, period of occurrence |  |  | February 8, 2017 |  |  |  |
Liability insurance |  |  |  |  |  |  | $ 1,000,000
Property damage and business interruption losses |  |  |  |  |  |  | $ 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 operating activities |  | $ 2,500,000 |  |  |  |  |
Payment of Penalties | $ 40,000 |  |  |  |  |  |
Asset Retirement Obligation |  |  |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Environmental reserve |  |  | $ 18,300,000 |  |  |  |
Environmental Contingencies |  |  |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Environmental reserve |  |  | 9,000,000 |  |  |  |
Other Long-Term Liabilities |  |  |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Environmental reserve |  |  | $ 22,300,000 |  |  |  |
Maximum |  |  |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Remaining lease term |  |  | 4 years |  |  |  |
Purchase commitments term, years |  |  | 22 years |  |  |  |
Minimum |  |  |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Purchase commitments term, years |  |  | 1 year |  |  |  |

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