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Summary of Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 168,956	$ 166,283
Less accumulated depreciation	(103,011)	(100,901)
Property, plant and equipment, net	65,945	65,382
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,756	2,756
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	19,731	19,786
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	126,425	124,199
Office furniture, fixtures and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	9,530	7,403
Automotive equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,747	1,747
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 8,767	$ 10,392

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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