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Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) Customer Institution Supplier | Dec. 31, 2018 USD ($) Customer | Dec. 31, 2017 USD ($) Customer | Jan. 01, 2019 USD ($)
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |
Maximum term of original maturities to classify as cash equivalent | 3 months |  |  |
Number of financial institutions where deposits are maintained | Institution | 1 |  |  |
Valuation allowance | $ 0 | $ 0 |  |
Number of customers that accounted for 10% or more of net sales | Customer | 3 | 2 | 2 |
Number of customer accounted for 10% or more account receivable | Customer | 3 |  |  |
Number of largest raw material suppliers | Supplier | 4 |  |  |
Excess of the replacement cost of inventory over the LIFO value of inventory | $ (19,062) | $ (18,442) |  |
Annual impairment test of goodwill | 0 | 0 | $ 0 |
Goodwill | 68,500 |  |  |
Valuation allowance | 2,988 | 3,015 |  |
Research and Development costs | 4,500 | 4,200 | 3,800 |
Prepaid expenses for production costs of advertising | 500 | 0 |  |
Branding Expenses | 35,700 | 35,000 | $ 31,000 |
Operating lease assets | 40,049 | 0 |  |
Operating lease liabilities | 7,079 | $ 0 |  |
Unpaid Liabilities relates to property plant and equipment | $ 800 |  |  |
Accounting Standards Update 2016-02 [Member] |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |
Operating lease assets |  |  |  | $ 45,800
Operating lease liabilities |  |  |  | $ 47,200
Residential Use [Member] |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |
Warranty period | 25 years |  |  |
Residential Use [Member] | Transcend Enhance Select And Universal Fascia Product [Member] |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |
Warranty period | 25 years |  |  |
Residential Use [Member] | Trex Signature Railing [Member] |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |
Warranty period | 25 years |  |  |
Commercial Use [Member] |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |
Warranty period | 10 years |  |  |
Commercial Use [Member] | Transcend Enhance Select And Universal Fascia Product [Member] |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |
Warranty period | 10 years |  |  |
Commercial Use [Member] | Trex Signature Railing [Member] |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |
Warranty period | 25 years |  |  |
Commercial Use [Member] | Maximum [Member] | Commercial Railing And Staging Systems [Member] |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |
Warranty period | 3 years |  |  |
Commercial Use [Member] | Minimum [Member] | Commercial Railing And Staging Systems [Member] |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |
Warranty period | 1 year |  |  |
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Minimum [Member] |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |
Concentration risk as percentage of total | 10.00% | 10.00% | 10.00% |
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Customer One [Member] |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |
Concentration risk as percentage of total | 57.00% | 42.00% | 41.00% |
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer One [Member] |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |
Concentration risk as percentage of total | 30.00% |  |  |
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer Two [Member] |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |
Concentration risk as percentage of total | 24.00% |  |  |
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer Three [Member] |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |
Concentration risk as percentage of total | 10.00% |  |  |
Raw Materials [Member] | Supplier Concentration Risk [Member] |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |
Concentration risk as percentage of total | 27.00% | 33.00% | 33.00% |

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