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Other Financial Statement Information - Property, Plant and Equipment - Net (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]    
Property, plant and equipment - Gross $ 265,355 $ 261,702
Less accumulated depreciation (162,169) (158,747)
Property, plant and equipment - Net 103,186 102,955
Land and Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment - Gross 12,638 12,552
Buildings and Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment - Gross 75,408 74,743
Machinery, Equipment and Aircraft [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment - Gross 173,453 171,015
Construction in Progress [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment - Gross $ 3,856 $ 3,392