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Commitments and Contingencies - Additional Information (Detail) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2013 USD ($) | Dec. 31, 2015 USD ($) ft² | Dec. 31, 2014 USD ($)
Schedule Of Commitments And Contingencies [Line Items] |  |  |
Charge recorded |  | $ 205,000 | $ 1,471,000
Minimum payments remaining under the Company's lease relating to its reconsidered corporate relocation for 2017 |  | 9,013,000 |
Minimum payments remaining under the Company's lease relating to its reconsidered corporate relocation for 2018 |  | 8,683,000 |
Minimum payments remaining under the Company's lease relating to its reconsidered corporate relocation for 2019 |  | 7,573,000 |
Increase in warranty reserve | $ 20,000,000 |  |
Change in warranty reserve for disclosure purposes only |  | $ 3,000,000 |
Minimum [Member] |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |
Average period for PE material purchases under short-term supply contracts for which pricing is negotiated as needed |  | 1 year |
Maximum [Member] |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |
Average period for PE material purchases under short-term supply contracts for which pricing is negotiated as needed |  | 2 years |
Surface Flaking Warranty Reserve [Member] |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |
Increase in warranty reserve |  | $ 5,426,000 |
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 |  | 49,756 |
Net minimum receipts remaining under the Company's existing subleases for 2016 |  | $ 1,100,000 |
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 |  | $ 700,000 |
Contract Termination [Member] |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |
Lease square feet | ft² |  | 55,047 |
Charge recorded |  | $ 200,000 | $ 1,500,000
Minimum payments remaining under the Company's lease relating to its reconsidered corporate relocation for 2016 |  | 1,900,000 |
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 |
Raw Material Supply Contracts [Member] |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |
Purchase commitment |  | 21,100,000 |
Purchase commitment, due in second year |  | 9,800,000 |
Purchase commitment, due in third year |  | 700,000 |
Purchase commitment, due in fourth year |  | $ 47,000 |

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