Commitments and Contingencies - Summary of Trex Residential Product Warranty and Surface Flaking Reserves Activity (Detail) - Surface Flaking Warranty Reserve [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Product Warranty Liability [Line Items]
Beginning balance	$ 22,178	$ 25,599
Provisions and changes in estimates	9,725	3,508
Settlements made during the period	(9,068)	(6,929)
Ending balance	22,835	22,178
Surface Flaking [Member]
Product Warranty Liability [Line Items]
Beginning balance	10,112	15,905
Provisions and changes in estimates	(1,486)	(3,800)
Settlements made during the period	(1,387)	(1,993)
Ending balance	7,239	10,112
Product Warranty [Member]
Product Warranty Liability [Line Items]
Beginning balance	12,066	9,694
Provisions and changes in estimates	11,211	7,308
Settlements made during the period	(7,681)	(4,936)
Ending balance	$ 15,596	$ 12,066