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Commitments and Contingencies - Additional Information (Detail) (USD $)
 0 Months Ended 3 Months Ended 12 Months Ended
Sep. 03, 2013
Lawsuits
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2013
Letter
Dec. 31, 2012
Schedule Of Commitments And Contingencies [Line Items]          
Number of lawsuits settled 2        
Capped cost to Trex, excluding attorneys' fees, upon final approval of the settlement by the Court       $ 8,250,000  
Capped attorneys' fees to be paid to Plaintiffs' counsel upon final approval of the settlement by the Court       1,450,000  
Liability related to mold growth litigation       3,174,000  
Expected total net cost to resolve the lawsuit will not exceed       10,000,000  
Average period for PE material purchases under short-term supply contracts for which pricing is negotiated as needed       2 years  
Charge recorded due to revised estimate of sublease receipts       1,144,000 727,000
Minimum payments remaining under the Company's lease relating to its reconsidered corporate relocation for 2014       6,803,000  
Minimum payments remaining under the Company's lease relating to its reconsidered corporate relocation for 2015       6,289,000  
Minimum payments remaining under the Company's lease relating to its reconsidered corporate relocation for 2016       5,362,000  
Minimum payments remaining under the Company's lease relating to its reconsidered corporate relocation for 2017       5,343,000  
Minimum payments remaining under the Company's lease relating to its reconsidered corporate relocation for 2018       5,277,000  
Minimum payments remaining under the Company's lease relating to its reconsidered corporate relocation, thereafter       15,198,000  
Increase in warranty reserve   20,000,000 20,000,000 20,000,000 21,487,000
Letters sent to homeowners       10,000  
Percentage change in warranty claims used as a threshold for disclosure       10.00%  
Change in warranty reserve for disclosure purposes only       4,100,000  
Raw Material Supply Contracts [Member]
          
Schedule Of Commitments And Contingencies [Line Items]          
Purchase commitment       19,200,000  
Purchase commitment, due in second year       8,600,000  
Purchase commitment, due in third year       1,500,000  
Purchase commitment, due in fourth year       49,000  
Third Party Manufacturing Contracts [Member]
          
Schedule Of Commitments And Contingencies [Line Items]          
Purchase commitment       4,400,000  
Purchase commitment, due in second year       1,900,000  
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] | Commercial and Residential Use [Member]
          
Schedule Of Commitments And Contingencies [Line Items]          
Warranty period       25 years  
Contract Termination [Member]
          
Schedule Of Commitments And Contingencies [Line Items]          
Expiration date of reconsidered corporate headquarters lease       Jun. 30, 2019  
Lease square feet       55,047  
Charge recorded due to revised estimate of sublease receipts   1,100,000      
Minimum payments remaining under the Company's lease relating to its reconsidered corporate relocation for 2014       1,700,000  
Minimum payments remaining under the Company's lease relating to its reconsidered corporate relocation for 2015       1,700,000  
Minimum payments remaining under the Company's lease relating to its reconsidered corporate relocation for 2016       1,800,000  
Minimum payments remaining under the Company's lease relating to its reconsidered corporate relocation for 2017       1,800,000  
Minimum payments remaining under the Company's lease relating to its reconsidered corporate relocation for 2018       1,800,000  
Minimum payments remaining under the Company's lease relating to its reconsidered corporate relocation, thereafter       900,000  
Minimum receipts remaining under the Company's existing subleases for 2014       1,300,000  
Minimum receipts remaining under the Company's existing subleases for 2015       800,000  
Minimum receipts remaining under the Company's existing subleases for 2016       700,000  
Minimum receipts remaining under the Company's existing subleases for 2017       700,000  
Minimum receipts remaining under the Company's existing subleases for 2018       700,000  
Minimum receipts remaining under the Company's existing subleases, thereafter       $ 400,000  
Sublease [Member]
          
Schedule Of Commitments And Contingencies [Line Items]          
Lease square feet       41,701