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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) | 12 Months Ended | 3 Months Ended | 12 Months Ended |  | 0 Months Ended | 12 Months Ended
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Dec. 31, 2013 Customer Supplier Institution | Dec. 31, 2012 Customer | Dec. 31, 2011 Customer | Dec. 31, 2010 | Dec. 31, 2013 Commercial Use [Member] | Dec. 31, 2013 Residential Use [Member] | Dec. 31, 2013 Trex Trim Trex Reveal Railing [Member] Residential and Commercial Use [Member] | Dec. 31, 2013 Transcend, Enhance, Select and Universal Fascia Product [Member] Commercial Use [Member] | Dec. 31, 2013 Transcend, Enhance, Select and Universal Fascia Product [Member] Residential Use [Member] | Sep. 30, 2013 Contract Termination [Member] | Dec. 31, 2013 Contract Termination [Member] sqft | Dec. 31, 2013 Sublease [Member] sqft | May 02, 2011 Iron Deck Acquisition [Member] | Dec. 31, 2013 Iron Deck Acquisition [Member] | Dec. 31, 2012 Iron Deck Acquisition [Member] | Dec. 31, 2013 Customer Concentration Risk [Member] Customer One [Member] | Dec. 31, 2012 Customer Concentration Risk [Member] Customer One [Member] | Dec. 31, 2011 Customer Concentration Risk [Member] Customer One [Member] | Dec. 31, 2012 Customer Concentration Risk [Member] Customer Two [Member] | Dec. 31, 2013 Customer Concentration Risk [Member] Minimum [Member] | Dec. 31, 2012 Customer Concentration Risk [Member] Minimum [Member] | Dec. 31, 2011 Customer Concentration Risk [Member] Minimum [Member] | Dec. 31, 2013 Credit Concentration Risk [Member] Customer One [Member] | Dec. 31, 2013 Credit Concentration Risk [Member] Customer Two [Member] | Dec. 31, 2013 Credit Concentration Risk [Member] Customer Three [Member] | Dec. 31, 2013 Supplier Concentration Risk [Member] | Dec. 31, 2012 Supplier Concentration Risk [Member] | Dec. 31, 2011 Supplier Concentration Risk [Member]
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Holding company's interest in Denplax | 35.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Charge to earning to fully reserve the equity investment and note |  |  |  | $ 2,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash paid for acquisition |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | 10,500,000 |  |  |  |  |  |  |  |  |  |  |  | 3,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in provision for future contingent payments |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000 | 1,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum term of original maturities to classify as cash equivalent | 3 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of financial institutions where deposits are maintained | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk as percentage of total |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 28.00% | 26.00% | 24.00% | 10.00% | 10.00% | 10.00% | 10.00% | 29.00% | 15.00% | 12.00% | 44.00% | 40.00% | 33.00%
Number of customers that accounted for 10% or more of net sales | 1 | 2 | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of customer accounted for 10% or more account receivable | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of largest raw material suppliers | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Excess of the replacement cost of inventory over the LIFO value of inventory | 24,497,000 | 23,719,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expiration date of reconsidered corporate headquarters lease |  |  |  |  |  |  |  |  |  |  | Jun. 30, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease square feet |  |  |  |  |  |  |  |  |  |  | 55,047 | 41,701 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Charge recorded due to revised estimate of sublease receipts | 1,144,000 | 727,000 |  |  |  |  |  |  |  | 1,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual impairment test of goodwill | 0 | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warranty period |  |  |  |  | 10 years | 25 years | 25 years | 10 years | 25 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Research and Development costs | 2,900,000 | 2,900,000 | 2,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prepaid expenses for production costs of advertising | 500,000 | 600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Branding Expenses | $ 20,900,000 | $ 20,500,000 | $ 19,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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