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Basis of Presentation and Significant Accounting Policies - Property, Plant and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]      
Property plant and equipment gross $ 1,525,552 $ 1,272,093  
Less: Accumulated depreciation 709,081 691,852  
Property, Plant and Equipment, Net 816,471 580,241 $ 439,239
Land      
Property, Plant and Equipment [Line Items]      
Property plant and equipment gross 9,585 8,919  
Buildings      
Property, Plant and Equipment [Line Items]      
Property plant and equipment gross 267,808 221,462  
Machinery and equipment      
Property, Plant and Equipment [Line Items]      
Property plant and equipment gross 827,785 775,997  
Property under construction      
Property, Plant and Equipment [Line Items]      
Property plant and equipment gross $ 420,374 $ 265,715