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Summary of Property, Plant and Equipment (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]    
Total gross value $ 159,181 $ 151,356
Less accumulated depreciation (99,380) (94,835)
Total net value 59,801 56,521
Land    
Property, Plant and Equipment [Line Items]    
Total gross value 2,706 2,706
Buildings and improvements    
Property, Plant and Equipment [Line Items]    
Total gross value 18,629 18,640
Machinery and equipment    
Property, Plant and Equipment [Line Items]    
Total gross value 119,920 116,757
Office furniture, fixtures and equipment    
Property, Plant and Equipment [Line Items]    
Total gross value 6,954 6,228
Automotive equipment    
Property, Plant and Equipment [Line Items]    
Total gross value 1,656 1,762
Construction in progress    
Property, Plant and Equipment [Line Items]    
Total gross value $ 9,316 $ 5,263