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Goodwill and Other Intangible Assets - Components of Other Intangible Assets and Changes in Gross Carrying Values (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |  |
Other Finite-Lived Intangible Assets, Gross Carrying Value |  | $ 31,897 | $ 34,156
Other Finite-Lived Intangible Assets, Accumulated Amortization |  | 17,653 | 15,618
Patents [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Other Finite-Lived Intangible Assets, Gross Carrying Value |  | 6,947 | 6,947
Other Finite-Lived Intangible Assets, Accumulated Amortization |  | 4,492 | 3,893
Non-compete Agreements [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Other Finite-Lived Intangible Assets, Gross Carrying Value |  | 387 | 453
Other Finite-Lived Intangible Assets, Accumulated Amortization |  | 173 | 113
Trademarks [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Other Finite-Lived Intangible Assets, Gross Carrying Value |  | 3,800 | 4,087
Other Finite-Lived Intangible Assets, Accumulated Amortization |  | 1,929 | 1,870
Customer Lists [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Other Finite-Lived Intangible Assets, Gross Carrying Value |  | 10,750 | 12,150
Other Finite-Lived Intangible Assets, Accumulated Amortization |  | 4,356 | 4,299
Know-how [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Other Finite-Lived Intangible Assets, Gross Carrying Value | [1] | 7,900 | 8,043
Other Finite-Lived Intangible Assets, Accumulated Amortization | [1] | 5,514 | 4,669
Supply Contract [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Other Finite-Lived Intangible Assets, Gross Carrying Value |  | 2,113 | 2,476
Other Finite-Lived Intangible Assets, Accumulated Amortization |  | $ 1,189 | $ 774
[1] | Know-how includes intellectual property rights covering proprietary information, written formulae, trade secrets or secret processes, inventions and developmental products (whether patentable or not), discoveries, improvements, compositions, manufacturing processes, manuals, specifications and technical data

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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://fasb.org/us-gaap/role/ref/legacyRef -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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