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Summary of Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Total gross value	$ 135,656	$ 134,223
Less accumulated depreciation	(87,077)	(84,902)
Property, plant and equipment, net	48,579	49,321
Land
Property, Plant and Equipment [Line Items]
Total gross value	2,458	2,458
Buildings and improvements
Property, Plant and Equipment [Line Items]
Total gross value	16,732	16,678
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total gross value	108,250	107,722
Office furniture, fixtures and equipment
Property, Plant and Equipment [Line Items]
Total gross value	5,179	4,713
Automotive equipment
Property, Plant and Equipment [Line Items]
Total gross value	1,010	735
Construction in progress
Property, Plant and Equipment [Line Items]
Total gross value	$ 2,027	$ 1,917

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
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- Definition

Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

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+ References

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-Topic 210
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