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Summary of Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 141,516	$ 138,451
Less accumulated depreciation	(90,137)	(89,199)
Property, plant and equipment, net	51,379	49,252
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,548	2,548
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	17,854	17,555
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	109,033	109,064
Office furniture, fixtures and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	5,819	5,655
Automotive equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,498	1,116
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 4,764	$ 2,513

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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