Goodwill and Long-Lived Assets - Narrative (Details) - USD ($)		3 Months Ended		12 Months Ended
	Aug. 31, 2018	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill [Line Items]
Goodwill addition				$ (662,000)	$ 131,509,000
Goodwill impairment		$ 63,000,000		63,000,000
Gross finite-lived intangible assets		154,113,000		154,113,000	156,703,000
Amortization of intangible assets				21,500,000	9,300,000	$ 4,500,000
2020		20,800,000		20,800,000
2021		16,300,000		16,300,000
2022		14,400,000		14,400,000
2023		12,700,000		12,700,000
2024		11,300,000		11,300,000
Thereafter		40,000,000.0		$ 40,000,000.0
Weighted-average useful life of finite-lived intangible assets				11 years
Customer relationships
Goodwill [Line Items]
Gross finite-lived intangible assets		142,400,000		$ 142,400,000	141,455,000
Trade names
Goodwill [Line Items]
Gross finite-lived intangible assets		7,293,000		7,293,000	7,235,000
Interface Performance Materials
Goodwill [Line Items]
Goodwill addition				(1,300,000)
Hollingsworth & Vose Company
Goodwill [Line Items]
Goodwill addition			$ 600,000
Interface
Goodwill [Line Items]
Goodwill expected to be deductible for income tax purposes		0		0
Gross finite-lived intangible assets	$ 106,900,000
Amortization of intangible assets					10,200,000	$ 9,200,000
Interface | Customer relationships
Goodwill [Line Items]
Gross finite-lived intangible assets	$ 103,700,000
Weighted average useful lives of acquired assets	11 years
Interface | Trade names
Goodwill [Line Items]
Gross finite-lived intangible assets	$ 3,200,000
Technical Nonwovens
Goodwill [Line Items]
Goodwill addition				0	0
Goodwill impairment		0		0
Performance Materials
Goodwill [Line Items]
Goodwill addition				(662,000)	131,509,000
Goodwill impairment		$ 63,000,000		63,000,000
Amortization of intangible assets				$ 12,200,000
Performance Materials | Interface
Goodwill [Line Items]
Goodwill addition					$ 131,000,000.0