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Summary of Property, Plant and Equipment (Detail) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 153,838 $ 151,356
Less accumulated depreciation (96,239) (94,835)
Property, plant and equipment, net 57,599 56,521
Land    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 2,706 2,706
Buildings and improvements    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 18,293 18,640
Machinery and equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 116,915 116,757
Office furniture, fixtures and equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 6,331 6,228
Automotive equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 1,565 1,762
Construction in progress    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 8,028 $ 5,263