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Summary of Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Total gross value	$ 173,292	$ 166,283
Less accumulated depreciation	(106,791)	(100,901)
Total net value	66,501	65,382
Land
Property, Plant and Equipment [Line Items]
Total gross value	2,923	2,756
Buildings and improvements
Property, Plant and Equipment [Line Items]
Total gross value	19,993	19,786
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total gross value	131,631	124,199
Office furniture, fixtures and equipment
Property, Plant and Equipment [Line Items]
Total gross value	10,057	7,403
Automotive equipment
Property, Plant and Equipment [Line Items]
Total gross value	1,901	1,747
Construction in progress
Property, Plant and Equipment [Line Items]
Total gross value	$ 6,787	$ 10,392

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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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