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Document and Entity Information
May 10, 2021
Cover [Abstract]  
Entity Registrant Name TREX CO INC
Amendment Flag true
Entity Central Index Key 0001069878
Document Type 8-K/A
Document Period End Date May 10, 2021
Entity Incorporation State Country Code DE
Entity File Number 001-14649
Entity Tax Identification Number 54-1910453
Entity Address, Address Line One 160 Exeter Drive
Entity Address, City or Town Winchester
Entity Address, State or Province VA
Entity Address, Postal Zip Code 22603-8605
City Area Code (540)
Local Phone Number 542-6300
Security 12b Title Common stock
Trading Symbol TREX
Security Exchange Name NYSE
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Amendment Description On May 10, 2021, Trex Company, Inc. (Company) furnished a Current Report on Form 8-K (Original Form 8-K) with the U.S. Securities and Exchange Commission to report that on May 10, 2021, the Company issued a press release announcing financial results for the quarterly period ended March 31, 2021. In addition to issuing a press release, the Company held a conference call on the same day to discuss financial and operating results. This Amendment No. 1 to the Original Form 8-K is furnished to include a transcript of such conference call.