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Commitments and Contingencies - Summary of Reconciliation of Company's Surface Flaking Warranty Reserve (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Sep. 30, 2013 | Dec. 31, 2014 | Dec. 31, 2013
Warranties [Line Items] |  |  |
Changes in estimates related to pre-existing warranties | $ 20,000 us-gaap_StandardProductWarrantyAccrualPreexistingIncreaseDecrease |  |
Surface Flaking Warranty Reserve [Member] |  |  |
Warranties [Line Items] |  |  |
Beginning balance |  | 40,312 us-gaap_StandardProductWarrantyAccrual / us-gaap_ValuationAllowancesAndReservesTypeAxis = trex_SurfaceFlakingWarrantyReserveMember | 28,487 us-gaap_StandardProductWarrantyAccrual / us-gaap_ValuationAllowancesAndReservesTypeAxis = trex_SurfaceFlakingWarrantyReserveMember
Changes in estimates related to pre-existing warranties | 20,000 us-gaap_StandardProductWarrantyAccrualPreexistingIncreaseDecrease / us-gaap_ValuationAllowancesAndReservesTypeAxis = trex_SurfaceFlakingWarrantyReserveMember |  | 20,000 us-gaap_StandardProductWarrantyAccrualPreexistingIncreaseDecrease / us-gaap_ValuationAllowancesAndReservesTypeAxis = trex_SurfaceFlakingWarrantyReserveMember
Settlements made during the period |  | (8,893)us-gaap_StandardProductWarrantyAccrualPayments / us-gaap_ValuationAllowancesAndReservesTypeAxis = trex_SurfaceFlakingWarrantyReserveMember | (8,175)us-gaap_StandardProductWarrantyAccrualPayments / us-gaap_ValuationAllowancesAndReservesTypeAxis = trex_SurfaceFlakingWarrantyReserveMember
Ending balance |  | $ 31,419 us-gaap_StandardProductWarrantyAccrual / us-gaap_ValuationAllowancesAndReservesTypeAxis = trex_SurfaceFlakingWarrantyReserveMember | $ 40,312 us-gaap_StandardProductWarrantyAccrual / us-gaap_ValuationAllowancesAndReservesTypeAxis = trex_SurfaceFlakingWarrantyReserveMember

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- Definition Amount as of the balance sheet date of the aggregate standard product warranty liability. Does not include the balance for the extended product warranty liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c)(1),(c)(5) -URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249 + Details
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- Definition Represents the aggregate decrease in the liability for payments made (in cash or in kind) to satisfy claims under the terms of the standard product warranty. Does not include any Increase or Decrease in the liability for payments related to extended product warranties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph ((c)(2)) -URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249 + Details
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- Definition Represents the aggregate Increase or Decrease in the liability during the reporting period for accruals related to preexisting standard product warranties (including adjustments related to changes in estimates). Does not include any Increase or Decrease in the liability for accruals related to extended product warranties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph ((c)(4)) -URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249 + Details
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