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Goodwill and Intangible Assets - Goodwill and Other Intangible Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Total Goodwill | $ 153,463 | $ 82,744
Total intangibles | 125,799 | 86,653
Accumulated amortization | (32,185) | (27,794)
Net intangibles | 93,614 | 58,859
Composite Fibers [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total Goodwill | 79,024 | 82,744
Composite Fibers [Member] | Technology and Related [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total intangibles | 38,813 | 40,686
Composite Fibers [Member] | Tradename Nonamortizing |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total intangibles | 4,556 | 4,773
Composite Fibers [Member] | Customer Relationships and Related [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total intangibles | 35,029 | 36,705
Advanced Airlaid Materials [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total Goodwill | 74,439 |
Advanced Airlaid Materials [Member] | Tradename [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total intangibles | 4,534 |
Advanced Airlaid Materials [Member] | Technology and Related [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total intangibles | 18,014 | 1,488
Advanced Airlaid Materials [Member] | Customer Relationships and Related [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total intangibles | $ 24,853 | $ 3,001

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