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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)

X

- 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

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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

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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

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