Segment Information Reportable Segments Information (Detail) - USD ($) $ in Thousands	3 Months Ended					9 Months Ended
	Dec. 31, 2017	Sep. 30, 2017		Sep. 30, 2016		Sep. 30, 2017	Sep. 30, 2016
Segment Reporting Information [Line Items]
Other Nonrecurring Expense, Planned Permaent Facility Closure		$ 800				$ 6,800
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down	$ 3,000	4,300
Net sales		426,504		$ 435,320		1,293,692	$ 1,309,195
Income from operations		5,451		9,280		45,674	87,207
Depreciation and amortization		25,856		22,747		79,468	65,921
Defined Benefit Plan, Settlements, Benefit Obligation							3,500
Consumer Products
Segment Reporting Information [Line Items]
Net sales		232,916		253,319		707,251	746,249
Income from operations		4,436	[1]	17,201	[1]	21,159	54,135
Depreciation and amortization		16,073	[1]	15,022	[1]	50,607	42,984
Pulp and Paperboard
Segment Reporting Information [Line Items]
Net sales		193,588		182,001		586,441	562,946
Income from operations		15,023		9,956		63,866	85,151
Depreciation and amortization		8,328		6,530		24,789	19,346
Operating Segments
Segment Reporting Information [Line Items]
Income from operations		19,459		27,157		85,025	139,286
Corporate
Segment Reporting Information [Line Items]
Income from operations		(14,008)		(17,877)	[2]	(39,351)	(52,079)	[2]
Depreciation and amortization		1,455		$ 1,195		4,072	$ 3,591
Oklahoma City [Domain] | Consumer Products
Segment Reporting Information [Line Items]
Other Nonrecurring Expense, Planned Permaent Facility Closure		$ 5,100				11,100
Restructuring and Related Cost, Accelerated Depreciation						$ 3,700

[1] 1 Operating income for the Consumer Products segment for the three and nine months ended September 30, 2017 includes $5.1 million and $11.1 million, respectively, of costs associated with the closure of the Oklahoma City facility. These costs for the three and nine months ended September 30, 2017 includes accelerated depreciation of $4.3 million on the writedown of assets to their held for sale value. Depreciation and amortization expense for the nine months ended September 30, 2017 includes $3.7 million of accelerated depreciation associated with the Oklahoma City facility closure.

[2] 2 For the three and nine months ended September 30, 2016, corporate expenses include $3.5 million of settlement expense associated with a lump sum buyout for term-vested participants of our salaried plan, which is discussed further in Note 10, "Pension and Other Postretirement Employee Benefit Plans."