Commitments, Guarantees, Indemnifications, and Legal Proceedings - Additional Information (Details)	12 Months Ended
	Dec. 31, 2017 USD ($) a	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Feb. 08, 2017 USD ($)
Schedule Of Commitments And Contingencies [Line Items]
Capital commitments	$ 281,300,000	$ 94,700,000
Area leased under timberland cutting rights (acres) | a	75,000
Average lease renewal term	6 years
Total lease expense	$ 100,600,000	88,300,000	$ 87,900,000
Sublease rental income	0
Capital lease obligations	20,300,000	21,600,000
Interest paid, capital lease obligations	1,400,000	1,500,000	1,600,000
Purchases during period under purchase agreements	339,100,000	362,000,000	$ 299,600,000
Environmental reserve	31,500,000
Environmental liabilities and asset retirement obligations	$ 4,000,000	$ 6,400,000
DeRidder, Louisiana
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
DeRidder, Louisiana | Other Expense, Net
Schedule Of Commitments And Contingencies [Line Items]
Claim with insurance carrier	$ 17,000,000
Asset Retirement Obligation
Schedule Of Commitments And Contingencies [Line Items]
Environmental reserve	24,000,000
Environmental Contingencies
Schedule Of Commitments And Contingencies [Line Items]
Environmental reserve	7,500,000
Other Long-Term Liabilities
Schedule Of Commitments And Contingencies [Line Items]
Environmental reserve	$ 27,500,000
Maximum
Schedule Of Commitments And Contingencies [Line Items]
Remaining lease term	14 years
Purchase commitments term, years	22 years
Minimum
Schedule Of Commitments And Contingencies [Line Items]
Purchase commitments term, years	1 year