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Summary of Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Total gross value	$ 135,999	$ 134,435
Less accumulated depreciation	(87,684)	(85,114)
Total net value	48,315	49,321
Land
Property, Plant and Equipment [Line Items]
Total gross value	2,548	2,458
Buildings and improvements
Property, Plant and Equipment [Line Items]
Total gross value	16,832	16,678
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total gross value	108,033	107,722
Office furniture, fixtures and equipment
Property, Plant and Equipment [Line Items]
Total gross value	5,001	4,925
Automotive equipment
Property, Plant and Equipment [Line Items]
Total gross value	1,102	735
Construction in progress
Property, Plant and Equipment [Line Items]
Total gross value	$ 2,483	$ 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.

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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.

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