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Stock-Based Compensation - SAR Activity (Detail) (Stock Appreciation Rights [Member], USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Stock Appreciation Rights [Member] |  |  |
Schedule Of Stock Appreciation Rights Activity [Line Items] |  |  |
SARs Outstanding, Beginning Balance | 739,194 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember | 1,374,380 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember | 2,325,410 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember
Granted, SARs | 3,866 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember | 121,176 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember | 201,828 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember
Exercised, SARs | (218,826)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember | (749,334)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember | (1,135,906)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember
Canceled, SARs | (8,404)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsForfeitures / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember | (7,028)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsForfeitures / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember | (16,952)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsForfeitures / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember
Shares Outstanding, SARs, Ending Balance | 515,830 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember | 739,194 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember | 1,374,380 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember
Outstanding, Weighted Average Grant Price Per Share, Beginning Balance | $ 12.93 trex_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionsEquityInstrumentsOutstandingWeightedAverageGrantPrice / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember | $ 9.28 trex_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionsEquityInstrumentsOutstandingWeightedAverageGrantPrice / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember | $ 6.59 trex_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionsEquityInstrumentsOutstandingWeightedAverageGrantPrice / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember
Vested, SARs | 383,488 trex_SharebasedCompensationArrangementByShareBasedPaymentAwardNonoptionEquityInstrumentsVested / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember |  |
Granted, Weighted Average Grant Price Per Share | $ 37.88 trex_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionsEquityInstrumentsGrantedWeightedAverageGrantPrice / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember | $ 21.95 trex_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionsEquityInstrumentsGrantedWeightedAverageGrantPrice / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember | $ 12.88 trex_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionsEquityInstrumentsGrantedWeightedAverageGrantPrice / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember
Exercisable, SARs | 383,488 trex_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercisable / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember |  |
Exercised, Weighted Average Grant Price Per Share | $ 10.96 trex_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionsEquityInstrumentsExercisedWeightedAverageGrantPrice / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember | $ 7.70 trex_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionsEquityInstrumentsExercisedWeightedAverageGrantPrice / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember | $ 6.54 trex_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionsEquityInstrumentsExercisedWeightedAverageGrantPrice / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember
Canceled, Weighted Average Grant Price Per Share | $ 4.74 trex_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionsEquityInstrumentsCanceledWeightedAverageGrantPrice / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember | $ 13.10 trex_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionsEquityInstrumentsCanceledWeightedAverageGrantPrice / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember | $ 12.08 trex_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionsEquityInstrumentsCanceledWeightedAverageGrantPrice / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember
Outstanding, Weighted Average Grant Price Per Share, Ending Balance | $ 13.98 trex_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionsEquityInstrumentsOutstandingWeightedAverageGrantPrice / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember | $ 12.93 trex_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionsEquityInstrumentsOutstandingWeightedAverageGrantPrice / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember | $ 9.28 trex_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionsEquityInstrumentsOutstandingWeightedAverageGrantPrice / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember
Vested, Weighted Average Grant Price Per Share | $ 12.55 trex_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionsEquityInstrumentsVestedWeightedAverageGrantPrice / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember |  |
Exercisable, Weighted Average Grant Price Per Share | $ 12.55 trex_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionsEquityInstrumentsExercisableWeightedAverageGrantPrice / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember |  |
Weighted Average Remaining Contractual Life, Outstanding | 6 years 6 months |  |
Weighted Average Remaining Contractual Life, Vested | 6 years 1 month 6 days |  |
Weighted Average Remaining Contractual Life, Exercisable | 6 years 1 month 6 days |  |
Aggregate Intrinsic Value, Outstanding | $ 14,754,320 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember |  |
Aggregate Intrinsic Value, Vested | 11,514,749 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember |  |
Aggregate Intrinsic Value, Exercisable | $ 11,514,749 trex_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionsExercisableIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember |  |

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