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Goodwill and Other Intangible Assets - Summary of Changes in Amounts of Goodwill and Other Intangible Assets (Detail) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Goodwill |  |
Goodwill, beginning balance | $ 164,369 |
Acquisitions | 36,231 |
Translation | (8,981) |
Goodwill, ending balance | 191,619 |
Finite-lived Intangible Assets [Roll Forward] |  |
Accumulated amortization, beginning balance | (51,829) |
Net intangibles, Amortization | (6,762) |
Accumulated amortization, ending balance | (55,671) |
Net intangibles, Acquisitions | 20,000 |
Total intangibles | 146,380 | $ 133,664
Intangible assets, net | 90,709 | $ 81,835
Intangible assets, gross, translation | (7,284) |
Intangible assets, accumulated amortization, translation | 2,920 |
Intangible assets, net, translation | (4,364) |
Composite Fibers |  |
Goodwill |  |
Goodwill, beginning balance | 84,586 |
Translation | (4,531) |
Goodwill, ending balance | 80,055 |
Composite Fibers | Tradename - Non Amortizing |  |
Indefinite-lived Intangible Assets [Roll Forward] |  |
Total intangibles, beginning balance | 3,902 |
Total intangibles, Translation | (220) |
Total intangibles, ending balance | 3,682 |
Composite Fibers | Technology and Related |  |
Finite-lived Intangible Assets [Roll Forward] |  |
Total intangibles, beginning balance | 41,578 |
Total intangibles, Translation | (2,189) |
Total intangibles, ending balance | 39,389 |
Accumulated amortization, beginning balance | (18,636) |
Net intangibles, Amortization | (1,424) |
Accumulated amortization, Translation | 952 |
Accumulated amortization, ending balance | (19,108) |
Net intangibles, beginning balance | 22,942 |
Net intangibles, Translation | (1,237) |
Net intangibles, ending balance | 20,281 |
Composite Fibers | Customer Relationships and Related |  |
Finite-lived Intangible Assets [Roll Forward] |  |
Total intangibles, beginning balance | 37,535 |
Total intangibles, Translation | (2,051) |
Total intangibles, ending balance | 35,484 |
Accumulated amortization, beginning balance | (21,290) |
Net intangibles, Amortization | (1,892) |
Accumulated amortization, Translation | 1,208 |
Accumulated amortization, ending balance | (21,974) |
Net intangibles, beginning balance | 16,245 |
Net intangibles, Translation | (843) |
Net intangibles, ending balance | 13,510 |
Airlaid Materials |  |
Goodwill |  |
Goodwill, beginning balance | 79,783 |
Acquisitions | 36,231 |
Translation | (4,450) |
Goodwill, ending balance | 111,564 |
Airlaid Materials | Technology and Related |  |
Finite-lived Intangible Assets [Roll Forward] |  |
Total intangibles, beginning balance | 20,053 |
Total intangibles, Translation | (1,099) |
Total intangibles, ending balance | 18,954 |
Accumulated amortization, beginning balance | (3,591) |
Net intangibles, Amortization | (968) |
Accumulated amortization, Translation | 223 |
Accumulated amortization, ending balance | (4,336) |
Net intangibles, beginning balance | 16,462 |
Net intangibles, Translation | (876) |
Net intangibles, ending balance | 14,618 |
Airlaid Materials | Customer Relationships and Related |  |
Finite-lived Intangible Assets [Roll Forward] |  |
Total intangibles, beginning balance | 26,636 |
Total intangibles, Translation | (1,502) |
Total intangibles, ending balance | 45,134 |
Accumulated amortization, beginning balance | (7,856) |
Net intangibles, Amortization | (2,333) |
Accumulated amortization, Translation | 506 |
Accumulated amortization, ending balance | (9,683) |
Net intangibles, beginning balance | 18,780 |
Net intangibles, Acquisitions | 20,000 |
Net intangibles, Translation | (996) |
Net intangibles, ending balance | 35,451 |
Airlaid Materials | Tradename |  |
Finite-lived Intangible Assets [Roll Forward] |  |
Total intangibles, beginning balance | 3,960 |
Total intangibles, Translation | (223) |
Total intangibles, ending balance | 3,737 |
Accumulated amortization, beginning balance | (456) |
Net intangibles, Amortization | (145) |
Accumulated amortization, Translation | 31 |
Accumulated amortization, ending balance | (570) |
Net intangibles, beginning balance | 3,504 |
Net intangibles, Translation | (192) |
Net intangibles, ending balance | $ 3,167 |

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