Discontinued Operations - Summary of Discontinued Operations included in Consolidated Statements of Income (Loss) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Non-operating income (expense)
Income (loss) before income taxes	$ 1,284	$ (207,242)	$ 19,868
Income tax provision (benefit)	(2,386)	(30,086)	6,342
Income (loss) from discontinued operations	3,670	(177,156)	13,526
Specialty Papers [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Total revenues		664,574	796,061
Costs of products sold		637,472	751,135
Gross profit		27,102	44,926
Selling, general and administrative expenses	109	32,465	22,538
(Gains) losses on dispositions of plant, equipment and timberlands, net		(423)	219
Operating income (loss)	(109)	(4,940)	22,169
Non-operating income (expense)
Interest expense		(6,942)	(4,455)
Other, net	1,393	(51,236)	2,154
Impairment charge	(144,100)	(144,124)
Income (loss) before income taxes	1,284	(207,242)	19,868
Income tax provision (benefit)	(2,386)	(30,086)	6,342
Income (loss) from discontinued operations	$ 3,670	(177,156)	13,526
Specialty Papers [Member] | Product [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Total revenues		661,186	790,935
Specialty Papers [Member] | Energy and Related Sales Net [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Total revenues		$ 3,388	$ 5,126