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Seasonality
12 Months Ended
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.