Summary of Significant Accounting Policies - Additional Information (Details)	12 Months Ended
	Dec. 31, 2017 USD ($) a	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Summary of Significant Accounting Policies [Line Items]
Research and development costs	$ 12,800,000	$ 13,300,000	$ 13,100,000
Cash and cash equivalents	216,900,000	239,300,000	184,200,000	$ 124,900,000
Cash equivalents	160,200,000	178,400,000
Allowance for doubtful accounts	$ 4,200,000	3,800,000
Customer returns, allowances and earned discounts as a percentage of gross selling price	1.00%
Reserve for customer accounts receivable, percentage	1.00%
Reserve for customer deductions	$ 8,400,000	6,300,000
Interest capitalization, construction in progress	$ 2,500,000	$ 2,500,000	2,000,000
Intangible asset, useful life, in years	11 years 8 months 12 days	12 years 10 months 24 days
Goodwill	$ 883,200,000	$ 737,900,000	544,000,000
Goodwill and intangible asset impairment	0	0	0
Deferred financing costs	$ 15,300,000	12,500,000
Area leased under timberland cutting rights (acres) | a	75,000
Area leased where fiber farms are operated (acres) | a	9,000
Depletion expense	$ 5,200,000	4,700,000	7,000,000
Impairment loss	(13,500,000)
Software amortization expense	2,300,000	2,500,000	$ 3,000,000
Unrecognized excess tax benefits	4,200,000
Other long-term assets
Summary of Significant Accounting Policies [Line Items]
Long-term lease costs capitalization (Cutting rights and Fiber farms)	31,500,000	43,900,000
Net capitalized software costs	3,300,000	4,500,000
Adjustments for New Accounting Pronouncement | Long-term debt
Summary of Significant Accounting Policies [Line Items]
Deferred financing costs		$ 12,400,000
ASU 2014-09 | Customers Under Consignment Agreement
Summary of Significant Accounting Policies [Line Items]
Cumulative impact of opening retained earnings, net of tax	1,600,000
ASU 2016-09
Summary of Significant Accounting Policies [Line Items]
Excess tax benefits from share-based compensation	6,800,000
Unrecognized excess tax benefits	$ 0
Customer Relationships
Summary of Significant Accounting Policies [Line Items]
Intangible asset, useful life, in years	11 years 9 months 18 days	13 years 1 month 6 days
Trademarks and Trade Names
Summary of Significant Accounting Policies [Line Items]
Intangible asset, useful life, in years	9 years 9 months 18 days	10 years 6 months
Minimum
Summary of Significant Accounting Policies [Line Items]
Term of senior credit facilities and notes, in years	5 years
Minimum | Adjustments for New Accounting Pronouncement | Long-term debt
Summary of Significant Accounting Policies [Line Items]
Deferred financing costs	$ 15,300,000
Minimum | Customer Relationships
Summary of Significant Accounting Policies [Line Items]
Intangible asset, useful life, in years	10 years
Minimum | Trademarks and Trade Names
Summary of Significant Accounting Policies [Line Items]
Intangible asset, useful life, in years	2 years
Maximum
Summary of Significant Accounting Policies [Line Items]
Term of senior credit facilities and notes, in years	10 years
Maximum | Customer Relationships
Summary of Significant Accounting Policies [Line Items]
Intangible asset, useful life, in years	40 years
Maximum | Trademarks and Trade Names
Summary of Significant Accounting Policies [Line Items]
Intangible asset, useful life, in years	20 years
Foreign operations
Summary of Significant Accounting Policies [Line Items]
Cash and cash equivalents	$ 1,800,000	$ 3,400,000