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Commitments and Contingencies - Additional Information (Detail) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2024 USD ($) | Oct. 26, 2021 a
Schedule Of Commitments And Contingencies [Line Items] |  |
Change in warranty reserve for disclosure purposes only | $ | $ 0.8 |
Area of Land | a |  | 300
Surface Flaking Warranty Reserve [Member] |  |
Schedule Of Commitments And Contingencies [Line Items] |  |
Percentage change in warranty claims used as a threshold for disclosure | 10.00% |
Residential Use [Member] | Products Sold Prior to January One, Two Thousand and Twenty Three [Member] |  |
Schedule Of Commitments And Contingencies [Line Items] |  |
Warranty period | 25 years |
Commercial Use [Member] |  |
Schedule Of Commitments And Contingencies [Line Items] |  |
Warranty period | 10 years |
Commercial Use [Member] | Products Sold Prior to January One, Two Thousand and Twenty Three [Member] |  |
Schedule Of Commitments And Contingencies [Line Items] |  |
Warranty period | 10 years |
Signature Railing And Transcend Cladding [Member] | Commercial Use [Member] |  |
Schedule Of Commitments And Contingencies [Line Items] |  |
Warranty period | 25 years |
Transcend Decking [Member] | Residential Use [Member] | Products Sold on or After January One, Two Thousand and Twenty Three [Member] |  |
Schedule Of Commitments And Contingencies [Line Items] |  |
Warranty period | 50 years |
Select Decking And Universal Fascia [Member] | Residential Use [Member] | Products Sold on or After January One, Two Thousand and Twenty Three [Member] |  |
Schedule Of Commitments And Contingencies [Line Items] |  |
Warranty period | 35 years |
Enhance Decking And Transcend, Select, Enhance And Signature Railing [Member] | Residential Use [Member] | Products Sold on or After January One, Two Thousand and Twenty Three [Member] |  |
Schedule Of Commitments And Contingencies [Line Items] |  |
Warranty period | 25 years |
Signature Railing [Member] | Residential and Commercial Use [Member] | Products Sold Prior to January One, Two Thousand and Twenty Three [Member] |  |
Schedule Of Commitments And Contingencies [Line Items] |  |
Warranty period | 25 years |

X
- Definition Percentage change in the expected number of remaining claims to be settled with payment or the expected cost to settle claims used as a threshold for disclosure. + References No definition available. + Details
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Namespace Prefix: | trex_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Schedule of commitments and contingencies. + References No definition available. + Details
Name: | trex_ScheduleOfCommitmentsAndContingenciesLineItems
Namespace Prefix: | trex_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Estimated change in the warranty reserve resulting from a 10% change in the expected number of remaining claims to be settled with payment or the expected cost to settle claims for disclosure purposes only. + References No definition available. + Details
Name: | trex_SensitivityChangeInSurfaceFlakingWarrantyReserve
Namespace Prefix: | trex_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The number of years the Company warrants that its products will be free from material defects in workmanship and materials. + References No definition available. + Details
Name: | trex_WarrantyPeriod
Namespace Prefix: | trex_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Area of land held. + References No definition available. + Details
Name: | us-gaap_AreaOfLand
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:areaItemType
Balance Type: | na
Period Type: | instant

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_GuaranteeObligationsByNatureAxis=trex_CommercialUseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=trex_SignatureRailingAndTranscendCladdingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=trex_TranscendDeckingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_ProductOrServiceAxis=trex_SelectDeckingAndUniversalFasciaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_ProductOrServiceAxis=trex_EnhanceDeckingAndTranscendSelectEnhanceAndSignatureRailingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |