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Summary of Property, Plant and Equipment (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Total gross value $ 132,977 $ 133,569
Less accumulated depreciation (82,594) (83,274)
Total net value 50,383 50,295
Land    
Property, Plant and Equipment [Line Items]    
Total gross value 2,458 2,458
Buildings and improvements    
Property, Plant and Equipment [Line Items]    
Total gross value 16,567 15,515
Machinery and equipment    
Property, Plant and Equipment [Line Items]    
Total gross value 107,278 102,146
Office furniture, fixtures and equipment    
Property, Plant and Equipment [Line Items]    
Total gross value 4,952 5,016
Automotive equipment    
Property, Plant and Equipment [Line Items]    
Total gross value 398 387
Construction in progress    
Property, Plant and Equipment [Line Items]    
Total gross value $ 1,324 $ 8,047