Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions		12 Months Ended
	Jan. 01, 2023	Dec. 31, 2024
Schedule Of Commitments And Contingencies [Line Items]
Change in warranty reserve for disclosure purposes only		$ 0.6
Warranty reserve increase (decrease)		1.5
Industrial Revenue Bonds (IRBs) [Member]
Schedule Of Commitments And Contingencies [Line Items]
Bonds issue		450.0
Gross asset and liability		$ 100.0
Surface Flaking Warranty Reserve [Member]
Schedule Of Commitments And Contingencies [Line Items]
Percentage change in warranty claims used as a threshold for disclosure		10.00%
Residential Use [Member]
Schedule Of Commitments And Contingencies [Line Items]
Warranty period	25 years
Residential Use [Member] | Products Sold Prior to January One, Two Thousand and Twenty Three [Member]
Schedule Of Commitments And Contingencies [Line Items]
Warranty period		25 years
Commercial Use [Member]
Schedule Of Commitments And Contingencies [Line Items]
Warranty period	10 years	10 years
Commercial Use [Member] | Products Sold Prior to January One, Two Thousand and Twenty Three [Member]
Schedule Of Commitments And Contingencies [Line Items]
Warranty period		10 years
Signature Railing And Transcend Cladding [Member]
Schedule Of Commitments And Contingencies [Line Items]
Warranty period	25 years
Signature Railing And Transcend Cladding [Member] | Commercial Use [Member]
Schedule Of Commitments And Contingencies [Line Items]
Warranty period		25 years
Transcend Decking [Member] | Residential Use [Member]
Schedule Of Commitments And Contingencies [Line Items]
Warranty period	50 years
Transcend Decking [Member] | Residential Use [Member] | Products Sold on or After January One, Two Thousand and Twenty Three [Member]
Schedule Of Commitments And Contingencies [Line Items]
Warranty period		50 years
Select Decking And Universal Fascia [Member] | Residential Use [Member]
Schedule Of Commitments And Contingencies [Line Items]
Warranty period	35 years
Select Decking And Universal Fascia [Member] | Residential Use [Member] | Products Sold on or After January One, Two Thousand and Twenty Three [Member]
Schedule Of Commitments And Contingencies [Line Items]
Warranty period		35 years
Enhance Decking And Transcend, Select, Enhance And Signature Railing [Member] | Residential Use [Member]
Schedule Of Commitments And Contingencies [Line Items]
Warranty period	25 years
Enhance Decking And Transcend, Select, Enhance And Signature Railing [Member] | Residential Use [Member] | Products Sold on or After January One, Two Thousand and Twenty Three [Member]
Schedule Of Commitments And Contingencies [Line Items]
Warranty period		25 years
Signature Railing [Member] | Residential Use [Member]
Schedule Of Commitments And Contingencies [Line Items]
Warranty period	25 years
Signature Railing [Member] | Residential and Commercial Use [Member] | Products Sold Prior to January One, Two Thousand and Twenty Three [Member]
Schedule Of Commitments And Contingencies [Line Items]
Warranty period		25 years
Raw Material Supply Contracts [Member]
Schedule Of Commitments And Contingencies [Line Items]
Purchase commitment, due in second year		$ 50.7
Purchase commitment, due in fourth year		$ 86.2