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Commitments and Contingencies - Additional Information (Detail) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 USD ($) | Dec. 31, 2016 USD ($) ft² | Dec. 31, 2015 USD ($)
Schedule Of Commitments And Contingencies [Line Items] |  |  |
Minimum payments, 2017 |  | $ 9,606 |
Minimum payments, 2018 |  | 9,271 |
Minimum payments, 2019 |  | 8,205 |
Change in warranty reserve for disclosure purposes only |  | $ 3,400 |
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 | $ 9,800 | $ 9,835 | $ 5,426
Change in percentage of annual cash outflow for surface flaking claims declined |  | 21.00% | 19.00%
Change in annual cash outflow for surface flaking claims declined |  | $ 1,500 | $ 1,700
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 |
Trex Signature Railing [Member] | Residential Use [Member] |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |
Warranty period |  | 25 years |
Trex Signature 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 |  | $ 1,300 |
Net minimum receipts remaining under the Company's existing subleases for 2018 |  | 1,300 |
Net minimum receipts remaining under the Company's existing subleases for 2019 |  | $ 700 |
Contract Termination [Member] |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |
Lease square feet | ft² |  | 55,047 |
Minimum payments, 2017 |  | $ 1,900 |
Minimum payments, 2018 |  | 2,000 |
Minimum payments, 2019 |  | 1,000 |
Waste Wood And Pe Material Supply Contracts [Member] |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |
Purchase commitment |  | 20,200 |
Purchase commitment, due in second year |  | 3,200 |
Purchase commitment, due in third year |  | 350 |
Purchase commitment, due in fourth year |  | $ 50 |

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