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Goodwill and Intangible Assets - Goodwill and Other Intangible Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Finite-Lived Intangible Assets [Line Items] |  |
Goodwill – Composite Fibers | $ 82,744 | $ 73,094
Total intangibles | 92,808 | 82,549
Accumulated amortization | (33,949) | (26,290)
Net intangibles | 58,859 | 56,259
Specialty Papers [Member] | Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total intangibles | 6,155 | 6,155
Composite Fibers [Member] | Tradename [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total intangibles | 4,773 | 4,195
Composite Fibers [Member] | Technology and Related [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total intangibles | 40,686 | 35,874
Composite Fibers [Member] | Customer Relationships and Related [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total intangibles | 36,705 | 32,310
Advanced Airlaid Materials [Member] | Technology and Related [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total intangibles | 1,488 | 1,377
Advanced Airlaid Materials [Member] | Customer Relationships and Related [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total intangibles | $ 3,001 | $ 2,638

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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