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Commitments and Contingencies - Additional Information (Detail)
6 Months Ended
Jun. 30, 2016
USD ($)
ft²
Schedule Of Commitments And Contingencies [Line Items]  
Change in warranty reserve for disclosure purposes only $ 2,700,000
Surface Flaking Warranty Reserve [Member]  
Schedule Of Commitments And Contingencies [Line Items]  
Average settlement cost per claim $ 2,778
Percentage of increase in average settlement cost per claim from prior period 9.60%
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]  
Lease square feet | ft² 46,648
Net minimum receipts remaining under the Company's existing subleases for 2016 $ 600,000
Net minimum receipts remaining under the Company's existing subleases for 2017 1,200,000
Net minimum receipts remaining under the Company's existing subleases for 2018 1,300,000
Net minimum receipts remaining under the Company's existing subleases for 2019 $ 600,000
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 $ 900,000
Minimum payments remaining under the Company's lease relating to its reconsidered corporate relocation for 2017 1,900,000
Minimum payments remaining under the Company's lease relating to its reconsidered corporate relocation for 2018 2,000,000
Minimum payments remaining under the Company's lease relating to its reconsidered corporate relocation for 2019 $ 1,000,000