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Goodwill and Other Intangibles - Finite and Indefinite-Lived Intangible Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Finite-lived intangible assets |  |  |
Gross Carrying Amount | $ 23,274 | $ 22,741 |
Accumulated Amortization | (13,254) | (12,266) |
Indefinite-lived intangible assets Goodwill | 16,544 | 15,769 | $ 15,821
Patents [Member] |  |  |
Finite-lived intangible assets |  |  |
Gross Carrying Amount | 4,806 | 4,816 |
Accumulated Amortization | (4,791) | (4,799) |
Land Use Rights [Member] |  |  |
Finite-lived intangible assets |  |  |
Gross Carrying Amount | 1,199 | 1,070 |
Accumulated Amortization | (201) | (180) |
Trademark [Member] |  |  |
Finite-lived intangible assets |  |  |
Gross Carrying Amount | 1,770 | 1,725 |
Accumulated Amortization | (1,166) | (1,039) |
Technology [Member] |  |  |
Finite-lived intangible assets |  |  |
Gross Carrying Amount | 3,149 | 3,057 |
Accumulated Amortization | (1,215) | (1,031) |
Customer Relationships [Member] |  |  |
Finite-lived intangible assets |  |  |
Gross Carrying Amount | 12,350 | 12,073 |
Accumulated Amortization | $ (5,881) | $ (5,217) |

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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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