Summary of Significant Accounting Policies (Policies)	6 Months Ended
Summary of Significant Accounting Policies (Policies)	Jun. 30, 2022
Accounting Policies [Abstract]
Stock-Based Compensation	The Company has one stock-based compensation plan, the 2014 Stock Incentive Plan (Plan), approved by Trex stockholders in April 2014. The Plan amended and restated in its entirety the Trex Company, Inc. 2005 Stock Incentive Plan. The Plan is administered by the Compensation Committee of the Trex Board of Directors. Stock-based compensation is granted to officers, directors and certain key employees in accordance with the provisions of the Plan. The Plan provides for grants of stock options, restricted stock, restricted stock units, stock appreciation rights (SARs), and unrestricted stock. The total aggregate number of shares of Trex common stock that may be issued under the Plan is 25,680,000 and as of June 30, 2022 , the total number of shares available for future issuance is 11,070,560.

- Definition

Disclosure of accounting policy for award under share-based payment arrangement. Includes, but is not limited to, methodology and assumption used in measuring cost.

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