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Commitments and Contingencies - Additional Information (Detail)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2016
USD ($)
ft²
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Schedule Of Commitments And Contingencies [Line Items]      
Change in warranty reserve for disclosure purposes only $ 3,500    
Surface Flaking Warranty Reserve [Member]      
Schedule Of Commitments And Contingencies [Line Items]      
Increase in warranty reserve 9,835 $ 5,426  
Change in annual cashout flow for surface flaking claims declined $ 1,100   $ 1,700
Change in percentage of annual cashout flow for surface flaking claims declined 21.00%   19.00%
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    
Commercial Use [Member]      
Schedule Of Commitments And Contingencies [Line Items]      
Warranty period 10 years    
Transcend, Enhance, Select and Universal Fascia Product [Member] | Residential Use [Member]      
Schedule Of Commitments And Contingencies [Line Items]      
Warranty period 25 years    
Transcend, Enhance, Select and Universal Fascia Product [Member] | Commercial Use [Member]      
Schedule Of Commitments And Contingencies [Line Items]      
Warranty period 10 years    
TrexTrim and Trex Reveal Railing [Member] | Residential Use [Member]      
Schedule Of Commitments And Contingencies [Line Items]      
Warranty period 25 years    
TrexTrim and Trex Reveal Railing [Member] | Commercial Use [Member]      
Schedule Of Commitments And Contingencies [Line Items]      
Warranty period 25 years    
Sublease [Member]      
Schedule Of Commitments And Contingencies [Line Items]      
Net minimum receipts remaining under the Company's existing subleases for 2016 $ 300    
Net minimum receipts remaining under the Company's existing subleases for 2017 1,300    
Net minimum receipts remaining under the Company's existing subleases for 2018 1,300    
Net minimum receipts remaining under the Company's existing subleases for 2019 $ 700    
Contract Termination [Member]      
Schedule Of Commitments And Contingencies [Line Items]      
Lease square feet | ft² 55,047    
Minimum payments remaining under the Company's lease relating to its reconsidered corporate relocation for 2016 $ 500    
Minimum payments remaining under the Company's lease relating to its reconsidered corporate relocation for 2017 1,900    
Minimum payments remaining under the Company's lease relating to its reconsidered corporate relocation for 2018 2,000    
Minimum payments remaining under the Company's lease relating to its reconsidered corporate relocation for 2019 $ 1,000