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Summary of Significant Accounting Policies - Additional Information (Detail) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
May. 07, 2014 | Dec. 31, 2015 USD ($) ft² Customer Institution Supplier $ / shares shares | Dec. 31, 2014 USD ($) Customer $ / shares shares | Dec. 31, 2013 USD ($) Customer | Dec. 31, 2010 USD ($) | Apr. 30, 2014 shares | Feb. 28, 2014 $ / shares
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Charge to earning to fully reserve the equity investment and note |  |  |  |  | $ 2,400,000 |  |
Stock split description |  | The stock split was in the form of a stock dividend distributed on May 7, 2014 to stockholders of record at the close of business on April 7, 2014. The stock split entitled each stockholder to receive one additional share of common stock, par value $0.01, for each share they held as of the record date. All common stock share and per share data for all periods presented in the accompanying consolidated financial statements and related notes are presented on a post-split basis. |  |  |  |  |
Common stock, par value | $ / shares |  | $ 0.01 | $ 0.01 |  |  |  | $ 0.01
Stock split conversion ratio | 2 |  |  |  |  |  |
Number of authorized shares of common stock | shares |  | 80,000,000 | 80,000,000 |  |  | 80,000,000 |
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 |  | 1 | 1 | 1 |  |  |
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 |  | $ 23,241,000 | $ 25,299,000 |  |  |  |
Charge recorded |  | 205,000 | 1,471,000 |  |  |  |
Annual impairment test of goodwill |  | 0 | 0 | $ 0 |  |  |
Goodwill |  | 10,500,000 |  |  |  |  |
Valuation allowance |  | 4,582,000 | 4,465,000 |  |  |  |
Research and Development costs |  | 1,500,000 | 2,300,000 | 2,900,000 |  |  |
Prepaid expenses for production costs of advertising |  | 77,000 | 500,000 |  |  |  |
Branding Expenses |  | $ 23,400,000 | 20,800,000 | $ 20,900,000 |  |  |
Scenario, Previously Reported [Member] |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Number of authorized shares of common stock | shares |  |  |  |  |  | 40,000,000 |
Contract Termination [Member] |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Expiration date of reconsidered corporate headquarters lease |  | Jun. 30, 2019 |  |  |  |  |
Lease square feet | ft² |  | 55,047 |  |  |  |  |
Charge recorded |  | $ 200,000 | $ 1,500,000 |  |  |  |
Sublease [Member] |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Lease square feet | ft² |  | 49,756 |  |  |  |  |
Residential Use [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 |  |  |  |  |
TrexTrim and Trex Reveal Railing [Member] | Residential Use [Member] |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Warranty period |  | 25 years |  |  |  |  |
TrexTrim and Trex Reveal Railing [Member] | Commercial Use [Member] |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Warranty period |  | 25 years |  |  |  |  |
Transcend, Enhance, Select and Universal Fascia Product [Member] | Residential Use [Member] |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Warranty period |  | 25 years |  |  |  |  |
Transcend, Enhance, Select and Universal Fascia Product [Member] | Commercial Use [Member] |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Warranty period |  | 10 years |  |  |  |  |
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 |  | 27.00% | 24.00% | 28.00% |  |  |
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer One [Member] |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Concentration risk as percentage of total |  | 31.00% |  |  |  |  |
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer Two [Member] |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Concentration risk as percentage of total |  | 13.00% |  |  |  |  |
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer Three [Member] |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Concentration risk as percentage of total |  | 13.00% |  |  |  |  |
Raw Materials [Member] | Supplier Concentration Risk [Member] |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Concentration risk as percentage of total |  | 35.00% | 38.00% | 44.00% |  |  |
Denplax [Member] |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Holding company's interest in Denplax |  | 35.00% |  |  |  |  |

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