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Commitments and Contingencies - Additional Information (Detail)
$ in Millions
3 Months Ended
Mar. 31, 2017
USD ($)
ft²
Schedule Of Commitments And Contingencies [Line Items]  
Change in warranty reserve for disclosure purposes only $ 3.3
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
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 2017 $ 1.0
Net minimum receipts remaining under the Company's existing subleases for 2018 1.3
Net minimum receipts remaining under the Company's existing subleases for 2019 $ 0.7
Contract Termination [Member]  
Schedule Of Commitments And Contingencies [Line Items]  
Lease square feet | ft² 55,047
Minimum payments, 2017 $ 1.4
Minimum payments, 2018 2.0
Minimum payments, 2019 $ 1.1