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Commitments and Contingencies - Additional Information (Detail)
$ in Thousands
6 Months Ended
Jun. 30, 2015
USD ($)
ft²
Jun. 30, 2014
USD ($)
Schedule Of Commitments And Contingencies [Line Items]    
Charge recorded $ 206 $ 741
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%  
Change in warranty reserve for disclosure purposes only $ 2,800  
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  
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  
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  
Sublease [Member]    
Schedule Of Commitments And Contingencies [Line Items]    
Lease square feet | ft² 24,732  
Minimum receipts remaining under the Company's existing subleases for 2015 $ 300  
Minimum receipts remaining under the Company's existing subleases for 2016 500  
Minimum receipts remaining under the Company's existing subleases for 2017 500  
Minimum receipts remaining under the Company's existing subleases for 2018 500  
Minimum receipts remaining under the Company's existing subleases for 2019 $ 400  
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 2015 $ 900  
Minimum payments remaining under the Company's lease relating to its reconsidered corporate relocation for 2016 1,900  
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 $ 1,100