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Other Financial Statement Information - Property, Plant and Equipment - Net (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Property, plant and equipment - Gross $ 262,875 $ 247,201
Less accumulated depreciation 154,568 142,097
Property, plant and equipment - Net 108,307 105,104
Land and Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment - Gross 13,287 12,584
Buildings and Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment - Gross 75,652 72,662
Machinery, Equipment and Aircraft [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment - Gross 169,916 158,078
Construction in Progress [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment - Gross $ 4,020 $ 3,877