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Seasonality | 12 Months Ended
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Dec. 31, 2017
Text Block [Abstract] |
Seasonality |
17. | SEASONALITY
The Company’s operating results have historically varied from quarter to quarter. Seasonal, erratic or prolonged adverse weather conditions in certain geographic regions reduce the level of home improvement and construction activity and can shift demand for Trex products to a later period. As part of its normal business practice and consistent with industry practice, the Company has historically offered incentive programs to its distributors and dealers to build inventory levels before the start of the prime deck-building season in order to ensure adequate availability of the Company’s product to meet anticipated seasonal consumer demand. The seasonal effects are often offset by the positive effect of the incentive programs.

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- Definition Identifies seasonal trends affecting the demand for Trex products and quarterly net sales. + References No definition available. + Details
Name: | trex_SeasonalityDisclosureTextBlock
Namespace Prefix: | trex_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_TextBlockAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration