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Background and Basis of Presentation - Additional Information (Detail) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Basis of Presentation [Line Items]    
Payments made to third parties   $ 38.0
Fiberon [Member]    
Basis of Presentation [Line Items]    
Business acquisition, membership interest acquired 100.00%  
Business acquisition, total purchase price $ 470.0