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Other Financial Statement Information - Property, Plant and Equipment - Net (Detail) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Property, Plant and Equipment [Line Items]    
Property, plant and equipment - Gross $ 326,118 $ 305,981
Less accumulated depreciation (180,718) (180,016)
Property, plant and equipment - Net 145,400 125,965
Land and Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment - Gross 21,507 22,132
Buildings and Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment - Gross 99,366 97,909
Machinery, Equipment and Aircraft [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment - Gross 195,897 176,377
Construction in Progress [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment - Gross $ 9,348 $ 9,563