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Summary of Property, Plant and Equipment (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Total gross value $ 135,474 $ 133,569
Less accumulated depreciation (84,049) (83,274)
Total net value 51,425 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 16,451 15,515
Machinery and equipment    
Property, Plant and Equipment [Line Items]    
Total gross value 105,018 102,146
Office furniture, fixtures and equipment    
Property, Plant and Equipment [Line Items]    
Total gross value 5,233 5,016
Automotive equipment    
Property, Plant and Equipment [Line Items]    
Total gross value 442 387
Construction in progress    
Property, Plant and Equipment [Line Items]    
Total gross value $ 5,872 $ 8,047