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Summary of Property, Plant and Equipment (Detail) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Property, Plant and Equipment [Line Items]    
Total gross value $ 170,967 $ 166,283
Less accumulated depreciation (104,434) (100,901)
Total net value 66,533 65,382
Land    
Property, Plant and Equipment [Line Items]    
Total gross value 2,756 2,756
Buildings and improvements    
Property, Plant and Equipment [Line Items]    
Total gross value 20,057 19,786
Machinery and equipment    
Property, Plant and Equipment [Line Items]    
Total gross value 127,605 124,199
Office furniture, fixtures and equipment    
Property, Plant and Equipment [Line Items]    
Total gross value 10,002 7,403
Automotive equipment    
Property, Plant and Equipment [Line Items]    
Total gross value 1,979 1,747
Construction in progress    
Property, Plant and Equipment [Line Items]    
Total gross value $ 8,568 $ 10,392