Earnings Per Share of Common Stock - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended								12 Months Ended
	Nov. 17, 2017	Dec. 31, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 31, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Income (loss) from continuing operations		$ (56,994)	$ (14,353)	$ (19,274)	$ (27,987)	$ 7,099	$ 29,968	$ 44,638	$ 17,746	$ (118,608)	$ 99,451	$ 323,427
Less: Preferred Stock dividends										(8,582)	(13,800)	(13,800)
Income (loss) from continuing operations attributable to common stockholders										(127,190)	85,651	309,627
Income from discontinued operations		$ 85,727	$ 137	$ 4,357	$ 5,937	$ 5,536	$ 7,969	$ 8,751	$ 6,709	96,158	28,965	1,537
Net income (loss) available for common stockholders										$ (31,032)	$ 114,616	$ 311,164
Shares used for determining basic earnings per share of common stock (in shares)										54,511,863	50,602,480	43,416,868
Dilutive effect of:
Stock options (in shares)										0	1,307	0
Performance and restricted shares (in shares)										0	1,431,794	1,113,866
Preferred Stock (in shares)										0	13,361,678	11,371,718
Shares used for determining diluted earnings per share of common stock (in shares)										54,511,863	65,397,259	55,902,452
Basic earnings per share (not in thousands)
Income (loss) from continuing operations (in dollars per share)		$ (0.91)	$ (0.29)	$ (0.46)	$ (0.64)	$ 0.07	$ 0.52	$ 0.80	$ 0.28	$ (2.33)	$ 1.70	$ 7.13
Income (loss) from discontinued operations (in dollars per share)		1.36	0	0.09	0.12	0.11	0.16	0.17	0.13	1.76	0.57	0.04
Net income (loss) per common share-Basic (in dollars per share)		0.45	(0.29)	(0.37)	(0.52)	0.18	0.68	0.97	0.41	(0.57)	2.27	7.17
Diluted earnings per share (not in thousands)
Income (loss) from continuing operations (in dollars per share)		(0.91)	(0.29)	(0.46)	(0.64)	0.07	0.47	0.70	0.28	(2.33)	1.52	5.78
Income (loss) from discontinued operations (in dollars per share)		1.36	0	0.09	0.12	0.11	0.13	0.13	0.10	1.76	0.44	0.03
Net income (loss) per common share-Diluted (in dollars per share)		$ 0.45	$ (0.29)	$ (0.37)	$ (0.52)	$ 0.18	$ 0.60	$ 0.83	$ 0.38	$ (0.57)	$ 1.96	$ 5.81
Tembec Inc.
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Total Company shares issued to Tembec shareholders (in shares)	8,400,000