Trex (TREX) 10-Q 3 Aug 20 2020 Q2 Quarterly report Financial data

Cover Page

Cover Page - shares	6 Months Ended
	Jun. 30, 2020	Jul. 20, 2020
Cover [Abstract]
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Type	10-Q
Document Fiscal Period Focus	Q2
Entity Central Index Key	0001069878
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity Registrant Name	TREX CO INC
Document Period End Date	Jun. 30, 2020
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Trading Symbol	TREX
Entity Shell Company	false
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		57,878,154
Entity File Number	001-14649
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	54-1910453
Entity Address, Address Line One	160 Exeter Drive
Entity Address, City or Town	Winchester
Entity Address, Postal Zip Code	22603-8605
Entity Address, State or Province	VA
City Area Code	540
Local Phone Number	542-6300
Title of 12(b) Security	Common stock
Security Exchange Name	NYSE
Document Quarterly Report	true

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Net sales	$ 220,648	$ 206,453	$ 421,043	$ 386,024
Cost of sales	128,243	123,009	238,941	233,214
Gross profit	92,405	83,444	182,102	152,810
Selling, general and administrative expenses	29,009	35,705	63,571	65,872
Income from operations	63,396	47,739	118,531	86,938
Interest income, net	(71)	(1)	(593)	(57)
Income before income taxes	63,467	47,740	119,124	86,995
Provision for income taxes	16,249	12,030	29,504	19,730
Net income	$ 47,218	$ 35,710	$ 89,620	$ 67,265
Basic earnings per common share	$ 0.82	$ 0.61	$ 1.55	$ 1.15
Basic weighted average common shares outstanding	57,866,967	58,486,192	57,998,247	58,514,676
Diluted earnings per common share	$ 0.81	$ 0.61	$ 1.54	$ 1.14
Diluted weighted average common shares outstanding	58,030,994	58,687,540	58,177,357	58,758,201
Comprehensive income	$ 47,218	$ 35,710	$ 89,620	$ 67,265

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 12,237	$ 148,833
Accounts receivable, net	249,682	78,462
Inventories	49,649	56,106
Prepaid expenses and other assets	19,516	19,803
Total current assets	331,084	303,204
Property, plant and equipment, net	224,909	171,300
Goodwill and other intangible assets, net	73,875	74,084
Operating lease assets	36,926	40,049
Other assets	4,196	3,602
Total assets	670,990	592,239
Current liabilities:
Accounts payable	28,135	15,227
Accrued expenses and other liabilities	78,456	58,265
Accrued warranty	5,178	5,178
Total current liabilities	111,769	78,670
Operating lease liabilities	30,776	34,242
Deferred income taxes	9,831	9,831
Non-current accrued warranty	18,951	20,317
Other long-term liabilities	2	4
Total liabilities	171,329	143,064
Commitments and contingencies
Stockholders' equity:
Preferred stock, $0.01 par value, 3,000,000 shares authorized; none issued and outstanding
Common stock, $0.01 par value, 180,000,000 shares authorized; 70,266,754 and 70,187,463 shares issued and 57,878,003 and 58,240,721 shares outstanding at June 30, 2020 and December 31, 2019, respectively	703	702
Additional paid-in capital	123,933	123,996
Retained earnings	651,300	561,680
Treasury stock, at cost, 12,388,751 and 11,946,742 shares at June 30, 2020 and December 31, 2019, respectively	(276,275)	(237,203)
Total stockholders' equity	499,661	449,175
Total liabilities and stockholders' equity	$ 670,990	$ 592,239

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Jun. 30, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	3,000,000	3,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	180,000,000	180,000,000
Common stock, shares issued	70,266,754	70,187,463
Common stock, shares outstanding	57,878,003	58,240,721
Treasury stock, shares	12,388,751	11,946,742

Statements of Changes in Stockh

Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings (Deficit) [Member]	Treasury Stock [Member]
Beginning Balance at Dec. 31, 2018	$ 342,963	$ 700	$ 124,224	$ 416,942	$ (198,903)
Beginning Balance, Shares at Dec. 31, 2018		58,551,653			11,446,683
Net income	31,555			31,555
Employee stock plans	302		302
Employee stock plans, Shares		24,472
Shares withheld for taxes on awards	(5,727)		(5,727)
Shares withheld for taxes on awards, Shares		(74,010)
Stock-based compensation	2,794	$ 1	2,793
Stock-based compensation, Shares		160,359
Repurchases of common stock	(8,730)				$ (8,730)
Repurchases of common stock, Shares		(124,989)			124,989
Ending Balance at Mar. 31, 2019	363,157	$ 701	121,592	448,497	$ (207,633)
Ending Balance, Shares at Mar. 31, 2019		58,537,485			11,571,672
Beginning Balance at Dec. 31, 2018	342,963	$ 700	124,224	416,942	$ (198,903)
Beginning Balance, Shares at Dec. 31, 2018		58,551,653			11,446,683
Net income	67,265
Ending Balance at Jun. 30, 2019	391,533	$ 701	122,720	484,207	$ (216,095)
Ending Balance, Shares at Jun. 30, 2019		58,440,204			11,696,823
Beginning Balance at Mar. 31, 2019	363,157	$ 701	121,592	448,497	$ (207,633)
Beginning Balance, Shares at Mar. 31, 2019		58,537,485			11,571,672
Net income	35,710			35,710
Employee stock plans	257		257
Employee stock plans, Shares		14,905
Shares withheld for taxes on awards	(1,254)		(1,254)
Shares withheld for taxes on awards, Shares		(19,174)
Stock-based compensation	2,125		2,125
Stock-based compensation, Shares		32,139
Repurchases of common stock	(8,462)				$ (8,462)
Repurchases of common stock, Shares		(125,151)			125,151
Ending Balance at Jun. 30, 2019	391,533	$ 701	122,720	484,207	$ (216,095)
Ending Balance, Shares at Jun. 30, 2019		58,440,204			11,696,823
Beginning Balance at Dec. 31, 2019	449,175	$ 702	123,996	561,680	$ (237,203)
Beginning Balance, Shares at Dec. 31, 2019		58,240,721			11,946,742
Net income	42,402			42,402
Employee stock plans	299		299
Employee stock plans, Shares		16,386
Shares withheld for taxes on awards	(3,856)		(3,856)
Shares withheld for taxes on awards, Shares		(38,142)
Stock-based compensation	2,775		2,775
Stock-based compensation, Shares		76,204
Repurchases of common stock	(39,072)				$ (39,072)
Repurchases of common stock, Shares		(442,009)			442,009
Ending Balance at Mar. 31, 2020	451,723	$ 702	123,214	604,082	$ (276,275)
Ending Balance, Shares at Mar. 31, 2020		57,853,160			12,388,751
Beginning Balance at Dec. 31, 2019	449,175	$ 702	123,996	561,680	$ (237,203)
Beginning Balance, Shares at Dec. 31, 2019		58,240,721			11,946,742
Net income	89,620
Ending Balance at Jun. 30, 2020	499,661	$ 703	123,933	651,300	$ (276,275)
Ending Balance, Shares at Jun. 30, 2020		57,878,003			12,388,751
Beginning Balance at Mar. 31, 2020	451,723	$ 702	123,214	604,082	$ (276,275)
Beginning Balance, Shares at Mar. 31, 2020		57,853,160			12,388,751
Net income	47,218			47,218
Employee stock plans	391		391
Employee stock plans, Shares		8,206
Shares withheld for taxes on awards	(1,199)		(1,199)
Shares withheld for taxes on awards, Shares		(12,393)
Stock-based compensation	1,528	$ 1	1,527
Stock-based compensation, Shares		29,030
Ending Balance at Jun. 30, 2020	$ 499,661	$ 703	$ 123,933	$ 651,300	$ (276,275)
Ending Balance, Shares at Jun. 30, 2020		57,878,003			12,388,751

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Operating Activities
Net income	$ 89,620	$ 67,265
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Depreciation and amortization	7,915	6,792
Stock-based compensation	4,303	4,918
(Gain) loss on disposal of property, plant and equipment	(134)	10
Other non-cash adjustments	(233)	(308)
Changes in operating assets and liabilities:
Accounts receivable	(171,220)	(26,746)
Inventories	6,457	14,882
Prepaid expenses and other assets	(2,335)	210
Accounts payable	12,195	(3,777)
Accrued expenses and other liabilities	(591)	(16,548)
Income taxes receivable/payable	21,691	(3,640)
Net cash (used in) provided by operating activities	(32,332)	43,058
Investing Activities
Expenditures for property, plant and equipment	(62,613)	(19,061)
Proceeds from sales of property, plant and equipment	2,146
Net cash used in investing activities	(60,467)	(19,061)
Financing Activities
Borrowings under line of credit	173,000	89,500
Principal payments under line of credit	(173,000)	(89,500)
Repurchases of common stock	(44,124)	(24,172)
Proceeds from employee stock purchase and option plans	688	560
Financing costs	(361)
Net cash used in financing activities	(43,797)	(23,612)
Net (decrease) increase in cash and cash equivalents	(136,596)	385
Cash and cash equivalents, beginning of period	148,833	105,699
Cash and cash equivalents, end of period	12,237	106,084
Supplemental Disclosure:
Cash paid for interest	143	321
Cash paid for income taxes, net	$ 7,813	$ 23,371

Business and Organization

Business and Organization	6 Months Ended
	Jun. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Business and Organization	1. BUSINESS AND ORGANIZATION Trex Company, Inc. (Company) is the world’s largest manufacturer of high-performance, low-maintenance ® 542-6300.

Basis of Presentation

Basis of Presentation	6 Months Ended
	Jun. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	2. BASIS OF PRESENTATION The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States for interim financial information and the instructions to Form 10-Q S-X The unaudited consolidated results of operations for the three and six months COVID-19 COVID-19 These unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements as of December 31, 2019 and 2018 and for each of the three years in the period ended December 31, 2019 included in the Annual Report of Trex Company, Inc. on Form 10-K,

Recently Adopted Accounting Sta

Recently Adopted Accounting Standards	6 Months Ended
	Jun. 30, 2020
Accounting Changes and Error Corrections [Abstract]
Recently Adopted Accounting Standards	3. RECENTLY ADOPTED ACCOUNTING STANDARDS In August 2018, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2018-15, Intangibles – Goodwill and Other – Internal-Use 350-40): internal-use In January 2017, the FASB issued ASU No. 2017-04, Intangibles—Goodwill and Other (Topic 350), Simplifying the Test for Goodwill Impairment In June 2016, the FASB issued ASU 2016-13, Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses in Financial Instruments

New Accounting Standards Not Ye

New Accounting Standards Not Yet Adopted	6 Months Ended
	Jun. 30, 2020
Accounting Changes and Error Corrections [Abstract]
New Accounting Standards Not Yet Adopted	4. NEW ACCOUNTING STANDARDS NOT YET ADOPTED In March 2020, the FASB issued ASU No. 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting Debt In December 2019, the FASB issued ASU No. 2019-12, Income Taxes (Topic 740), Simplifying the Accounting for Income Taxes step-up

Inventories

Inventories	6 Months Ended
	Jun. 30, 2020
Inventory Disclosure [Abstract]
Inventories	5. INVENTORIES Inventories valued at LIFO (last-in, first-out), June 30, December 31, Finished goods $ 31,764 $ 42,281 Raw materials 35,584 31,686 Total FIFO (first-in, first-out) 67,348 73,967 Reserve to adjust inventories to LIFO value (19,062 ) (19,062 ) Total LIFO inventories $ 48,286 $ 54,905 7 The Company utilizes the LIFO method of accounting to its Trex Residential wood-alternative decking and residential railing products, which generally provides for the matching of current costs with current revenues. However, under the LIFO method, reductions in annual inventory balances cause a portion of the Company’s cost of sales to be based on historical costs rather than current year costs (LIFO liquidation). Reductions in interim inventory balances expected to be replenished by year-end year-end year-end year-end Inventories valued at lower of cost (FIFO method) and net realizable value were $1.4 million at June 30, 2020 and $1.2 million at December 31, 2019, consisting primarily of raw materials. The Company utilizes the FIFO method of accounting to its Trex Commercial architectural railing and staging system products.

Prepaid Expenses and Other Asse

Prepaid Expenses and Other Assets	6 Months Ended
	Jun. 30, 2020
Text Block [Abstract]
Prepaid Expenses and Other Assets	6. PREPAID EXPENSES AND OTHER ASSETS Prepaid expenses and other assets consist of the following (in thousands): June 30, 2020 December 31, Revenues in excess of billings $ 7,999 $ 8,282 Prepaid expenses 8,762 6,664 Contract retainage 2,097 1,832 Income tax receivable 53 2,675 Other 605 350 Total prepaid expenses and other assets $ 19,516 $ 19,803

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	6 Months Ended
	Jun. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	7. GOODWILL AND OTHER INTANGIBLE ASSETS The carrying amount of goodwill by reportable segment at June 30, 2020 and December 31, 2019 was $14.2 million for Trex Residential and $54.3 million for Trex Commercial. The Company’s intangible assets consist of domain names. At June 30, 2020 and December 31, 2019, intangible assets were $6.3 million and accumulated amortization was $0.9 million and $0.7 million, respectively. Intangible asset amounts were determined based on the estimated economics of the asset and are amortized over the estimated useful lives on a straight-line basis over 15 years, which approximates the pattern in which the economic benefits are expected to be received. The Company evaluates the recoverability of intangible assets periodically and considers events or circumstances that may warrant revised estimates of useful lives or that may indicate an impairment. Intangible asset amortization expense for the six months ended June 30, 2020 and June 30, 2019, was $0.2 million and $0.2 million, respectively.

Accrued Expenses and Other Liab

Accrued Expenses and Other Liabilities	6 Months Ended
	Jun. 30, 2020
Payables and Accruals [Abstract]
Accrued Expenses and Other Liabilities	8. ACCRUED EXPENSES AND OTHER LIABILITIES Accrued expenses and other liabilities consist of the following (in thousands): June 30, December 31, Sales and marketing $ 26,319 $ 28,402 Income taxes 19,069 — Compensation and benefits 13,082 13,475 Operating lease liabilities 7,306 7,079 Manufacturing costs 2,677 2,564 Customer deposits 4,097 2,905 Billings in excess of revenues 1,423 816 Other 4,483 3,024 Total accrued expenses and other liabilities $ 78,456 $ 58,265

Debt

Debt	6 Months Ended
	Jun. 30, 2020
Debt Disclosure [Abstract]
Debt	9. DEBT The Company’s outstanding debt consists of a revolving credit facility. The Company had no outstanding borrowings under its revolving credit facility and remaining available borrowing capacity of $350 million at June 30, 2020 , and $300 million from July 1, 2020 through December 31, 2020. Revolving Credit Facility On November 5, 2019, the Company entered into a Fourth Amended and Restated Credit Agreement (Fourth Amended Credit Agreement) as borrower, Trex Commercial Products, Inc., as guarantor; Bank of America, N.A. as a Lender, Administrative Agent, Swing Line Lender and L/C Issuer; and certain other lenders including Wells Fargo Bank, N.A., who is also Syndication Agent, and Truist Bank, arranged by BOA Securities, Inc., as Sole Lead Arranger and Sole Bookrunner, to amend and restate the Third Amended and Restated Credit Agreement (Third Amended Credit Agreement), dated as of January 12, 2016, as amended. The Fourth Amended Credit Agreement provides the Company with one or more Revolving Loans in a collective maximum principal amount of $250 million from January 1 through June 30 of each year and a maximum principal amount of $200 million from July 1 through December 31 of each year throughout the term, which ends November 5, 2024. On May 26, 2020, the Company entered into a First Amendment to the Original Credit Agreement (the First Amendment) to provide for an additional $100 million line of credit through May 26, 2022. COVID-19 The Company entered into the First Amendment, as borrower; Trex Commercial Products, Inc. (TCP), as guarantor; Bank of America, N.A. (BOA), as a Lender, Administrative Agent, Swing Line Lender and L/C Issuer; and certain other lenders including Wells Fargo Bank, N.A. (Wells Fargo), who is also Syndication Agent; Truist Bank (Truist); and Regions Bank (Regions) (each, a Lender and collectively, the Lenders), arranged by BofA Securities, Inc. as Sole Lead Arranger and Sole Bookrunner. The First Amendment further provides that the New Credit Agreement is amended and restated by changing Schedule 2.01 to add applicable Lender percentages related to the Revolving B Commitment for BOA of 47.5%, Well Fargo of 28.0% and Regions of 24.5%. The Notes and interest rates for the Revolving A Commitments remained unchanged and are the same as previously disclosed. The Notes for Revolving A Commitments and Revolving B Commitments provide the Company, in the aggregate, the ability to borrow an amount up to the respective Revolving A Loan Limit and Revolving B Loan Limit during the respective Revolving A Term and Revolving B Term. The Company is not obligated to borrow any amount under either the Revolving A Loan or the Revolving B Loan. Within either the Revolving A Loan or the Revolving B Loan, the Company may borrow, repay and reborrow at any time or from time to time while the respective Revolving A Loan or Revolving B Loan remains in effect. Base Rate Loans (as defined in the Fourth Amended Credit Agreement) under the Revolving Loans and the Swing Line Loans accrue interest at the Base Rate plus the Applicable Rate (as defined in the Fourth Amended Credit Agreement) and Eurodollar Rate Loans for the Revolving Loans and Swing Line Loans accrue interest at the Adjusted London InterBank Offered Rate plus the Applicable Rate (as defined in the Fourth Amended Credit Agreement). The Base Rate for any day is a fluctuating rate per annum equal to the highest of (a) the Federal Funds Rate plus 0.50%, (b) the rate of interest in effect for such day as publicly announced from time to time by BOA as its prime rate, and (c) the Eurodollar Rate plus 1.0%. The Applicable Rate for Revolving B Commitments means the following percentages per annum, based upon the Consolidated Debt to Consolidated EBITDA Ratio as set forth in the most recent Compliance Certificate received by BOA as the Administrative Agent and as set forth in the New Credit Agreement: Pricing Tier Consolidated Debt to Eurodollar Rate Base Rate Loans Revolving B 1 > 2.50:1.00 2.75 % 1.75 % 0.60 % 2 < 2.50:1.00 2.50 % 1.50 % 0.55 % 3 < 2.00:1.00 but 2.25 % 1.25 % 0.50 % 4 < 1.50:1.00 1.80 % 0.80 % 0.45 % Compliance with Debt Covenants and Restrictions Pursuant to the terms of the Fourth Amended Credit Agreement, the Company is subject to certain loan compliance covenants. The Company was in compliance with all covenants as of June 30, 2020. Failure to comply with the financial covenants could be considered a default of repayment obligations and, among other remedies, could accelerate payment of any amounts outstanding.

Leases

Leases	6 Months Ended
	Jun. 30, 2020
Leases [Abstract]
Leases	10. LEASES The Company leases office space, storage warehouses and certain plant equipment under various operating leases. The Company’s operating leases have remaining lease terms of 1 year to 8 years. Lease terms may include options to extend or terminate the lease when it is reasonably certain that the Company will exercise that option. For the six months ended June 30, 2020 and June 30, 2019, total operating lease expense The following table includes supplemental cash flow information for the six months ended June 30, 2020 and June 30, 2019 and supplemental balance sheet information at June 30, 2020 and December 31, 2019 related to operating leases (in thousands): Six Months Ended Supplemental cash flow information June 30, June 30, Cash paid for amounts included in the measurement of operating lease liabilities $ 4,258 $ 4,242 Operating ROU assets obtained in exchange for lease liabilities $ 290 $ 388 Supplemental balance sheet information June 30, 2020 December 31, Operating lease ROU assets $ 36,926 $ 40,049 Operating lease liabilities: Accrued expenses and other current liabilities $ 7,306 $ 7,079 Operating lease liabilities 30,776 34,242 Total operating lease liabilities $ 38,082 $ 41,321 The following table summarizes maturities of operating lease liabilities at June 30, 2020 (in thousands): Maturities of operating lease liabilities 2020 $ 4,284 2021 8,398 2022 6,530 2023 6,138 2024 6,158 Thereafter 11,079 Total lease payments 42,587 Less imputed interest (4,505 ) Total operating liabilities $ 38,082

Financial Instruments

Financial Instruments	6 Months Ended
	Jun. 30, 2020
Investments, All Other Investments [Abstract]
Financial Instruments	11. FINANCIAL INSTRUMENTS The Company considers the recorded value of its financial assets and liabilities, consisting primarily of cash and cash equivalents, accounts receivable, accounts payable, accrued expenses, other current liabilities, and debt to approximate the fair value of the respective assets and liabilities on the Condensed Consolidated Balance Sheets at June 30, 2020 and December 31, 2019.

Stockholders' Equity

Stockholders' Equity	6 Months Ended
	Jun. 30, 2020
Equity [Abstract]
Stockholders' Equity	12. STOCKHOLDERS’ EQUITY Earnings Per Share The following table sets forth the computation of basic and diluted earnings per share (in thousands, except share and per share data): Three Months Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 Numerator: Net income available to common shareholders $ 47,218 $ 35,710 $ 89,620 $ 67,265 Denominator: Basic weighted average shares outstanding 57,866,967 58,486,192 57,998,247 58,514,676 Effect of dilutive securities: Stock appreciation rights and options 89,871 129,839 90,297 141,958 Restricted stock 74,156 71,509 88,813 101,567 Diluted weighted average shares outstanding 58,030,994 58,687,540 58,177,357 58,758,201 Basic earnings per share $ 0.82 $ 0.61 $ 1.55 $ 1.15 Diluted earnings per share $ 0.81 $ 0.61 $ 1.54 $ 1.14 Diluted earnings per share is computed using the weighted average number of shares determined for the basic earnings per share computation plus the dilutive effect of common stock equivalents using the treasury stock method. The computation of diluted earnings per share excludes the following potentially dilutive securities because the effect would be anti-dilutive: Three Months Ended Six Months Ended 2020 2019 2020 2019 Stock appreciation rights 19,792 24,536 14,464 18,675 Stock Repurchase Programs On February 16, 2018, the Board of Directors adopted a stock repurchase program of up to 5.8 million shares of the Company’s outstanding common stock (Stock Repurchase Program). As of June 30, 2020, the Company ha s million Due to the volatility and uncertainty in the stock market associated with the COVID-19 Amendment of Restated Certificate of Incorporation At the annual meeting of stockholders of the Company held on April 29, 2020, the Company’s stockholders approved an amendment of the Company’s Restated Certificate of Incorporation (Amendment), effective as of April 29, 2020. The Company’s Board of Directors unanimously approved the Amendment on February 19, 2020, subject to stockholder approval. The Amendment increases the number of shares of common stock, par value $0.01 per share, that the Company is authorized to issue from 120 million shares to 180 million shares. Stock Split On July 29, 2020, the Company’s Board of Directors approved a two-for-one stock split of the Company’s common stock, par value, $ 10-Q

Revenue From Contracts With Cus

Revenue From Contracts With Customers	6 Months Ended
	Jun. 30, 2020
Revenue from Contract with Customer [Abstract]
Revenue From Contracts With Customers	13. REVENUE FROM CONTRACTS WITH CUSTOMERS Trex Residential Products Trex Residential principally generates revenue from the manufacture and sale of its high-performance, low-maintenance, eco-friendly Trex Commercial Products Trex Commercial generates revenue from the manufacture and sale of its modular and architectural railing and staging systems. All of its revenues are from fixed-price contracts with customers. Trex Commercial contracts have a single performance obligation as the promise to transfer the individual goods or services is not separately identifiable from other promises in the contract and is, therefore, not distinct. The transaction price allocated to remaining performance obligations on contracts with an original duration greater than one year was $63.7 million as of June 30, 2020. The Company will recognize this revenue as contracts are completed, which is expected to occur within the next 24 months. For the three months and six months ended June 30, 2020 and 2019, net sales were disaggregated in the following tables by (1) market, (2) timing of revenue recognition, and (3) type of contract. The tables also include a reconciliation of the respective disaggregated net sales with the Company’s reportable segments (in thousands). Three Months Ended June 30, 2020 Reportable Segment Trex Trex Residential Commercial Total Timing of Revenue Recognition and Type of Contract Products transferred at a point in time and variable consideration contracts $ 208,877 $ — $ 208,877 Products transferred over time and fixed price contracts — 11,771 11,771 $ 208,777 $ 11,771 $ 220,648 Six Months Ended June 30, 2020 Reportable Segment Trex Trex Residential Commercial Total Timing of Revenue Recognition and Type of Contract Products transferred at a point in time and variable consideration contracts $ 395,751 $ — $ 395,751 Products transferred over time and fixed price contracts — 25,292 25,292 $ 395,751 $ 25,292 $ 421,043 Three Months Ended June 30, 2019 Reportable Segment Trex Trex Residential Commercial Total Timing of Revenue Recognition and Type of Contract Products transferred at a point in time and variable consideration contracts $ 193,468 $ — $ 193,468 Products transferred over time and fixed price contracts — 12,985 12,985 $ 193,468 $ 12,985 $ 206,453 Six Months Ended June 30, 2019 Reportable Segment Trex Trex Residential Commercial Total Timing of Revenue Recognition and Type of Contract Products transferred at a point in time and variable consideration contracts $ 358,947 $ — $ 358,947 Products transferred over time and fixed price contracts — 27,077 27,077 $ 358,947 $ 27,077 $ 386,024

Stock-Based Compensation

Stock-Based Compensation	6 Months Ended
	Jun. 30, 2020
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation	14. STOCK-BASED COMPENSATION The Company has one stock-based compensation plan, the 2014 Stock Incentive Plan (Plan), approved by the Company’s stockholders in April 2014. The Plan amended and restated in its entirety the Trex Company, Inc. 2005 Stock Incentive Plan. The Plan was subsequently amended and restated by the Company’s Board of Directors in May 2014 and May 2018. The Plan is administered by the Compensation Committee of the Company’s Board of Directors. Stock-based compensation is granted to officers, directors and certain key employees in accordance with the provisions of the Plan. The Plan provides for grants of stock options, restricted stock, restricted stock units, stock appreciation rights (SARs), and unrestricted stock. The total aggregate number of shares of the Company’s common stock that may be issued under the Plan is 12,840,000 and as of June 30, 2020, the total number of shares available for future issuance is 5,642,795. The following table summarizes the Company’s stock-based compensation grants for the six months ended June 30, 2020: Stock Awards Granted Weighted-Average Per Share Time-based restricted stock units 21,689 $ 99.95 Performance-based restricted stock units (a) 38,842 $ 78.64 Stock appreciation rights 21,643 $ 100.30 (a) Includes 26,652 of target performance-based restricted stock unit awards granted during the six months ended June 30, 2020, and adjustments of (2,562 ) The fair value of each SAR is estimated on the date of grant using a . Six Months Ended June 30, 2020 Six Months Ended June 30, 2019 Weighted-average fair value of grants $ 35.37 $ 29.56 Dividend yield 0 % 0 % Average risk-free interest rate 1.3 % 2.5 % Expected term (years) 5 5 Expected volatility 38.2 % 39.1 % The Company recognizes stock-based compensation expense ratably over the period from the grant date to the earlier of: (1) the vesting date of the award, or (2) the date the grantee is eligible to retire without forfeiting the award. For performance-based restricted stock and performance-based restricted stock units, expense is recognized ratably over the performance and vesting period of each tranche based on management’s judgment of the ultimate award that is likely to be paid out based on the achievement of the predetermined performance measures. For the employee stock purchase plan, compensation expense is recognized related to the discount on purchases. Stock-based compensation expense in included in “Selling, general and administrative expenses” in the Condensed Consolidated Statements of Comprehensive Income. The following table summarizes the Company’s stock-based compensation expense (in thousands): Three Months Ended Six Months Ended 2020 2019 2020 2019 Stock appreciation rights $ 96 $ 203 $ 450 $ 498 Time-based restricted stock and restricted stock units 671 1,306 1,928 2,455 Performance-based restricted stock and restricted stock units 562 569 1,695 1,883 Employee stock purchase plan 200 47 230 82 Total stock-based compensation $ 1,529 $ 2,125 $ 4,303 $ 4,918 Total unrecognized compensation cost related to unvested awards as of June 30, 2020 was $6.8 million. The cost of these unvested awards is being recognized over the requisite vesting period of each award.

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2020
Income Tax Disclosure [Abstract]
Income Taxes	15. INCOME TAXES The Company’s effective tax rate for the six months ended June 30, 2020 and 2019 was 24.8% and 22.7%, respectively, which resulted in expense of $29.5 million and $19.7 million, respectively. The in de non-deductible During the six months ended June 30, 2020 and 2019, the Company realized $1.1 million and $2.6 million, respectively, of excess tax benefits from stock-based awards and recorded a corresponding benefit to income tax expense. The Company analyzes its deferred tax assets each reporting period, considering all available positive and negative evidence in determining the expected realization of those deferred tax assets. As of June 30, 2020, the Company maintains a valuation allowance of $3.0 million against deferred tax assets primarily related to state tax credits it estimates will expire before they are realized. In response to COVID-19, The Company operates in multiple tax jurisdictions and, in the normal course of business, its tax returns are subject to examination by various taxing authorities. Such examinations may result in future assessments by these taxing authorities, and the Company accrues a liability when it believes that it is more likely than not that benefits of tax positions will not be realized. The Company believes that adequate provisions have been made for all tax returns subject to examination. As of June 30, 2020, for certain tax jurisdictions tax years 2016 through 2019 remain subject to examination. The Company’s returns filed with the state of Michigan for the tax years 2016 through 2018 are currently under examination. No material adjustments are expected as a result of the audit. Sales made to foreign distributors are not taxable in any foreign jurisdiction as the Company does not have a taxable presence in any foreign jurisdiction.

Segment Information

Segment Information	6 Months Ended
	Jun. 30, 2020
Segment Reporting [Abstract]
Segment Information	16. SEGMENT INFORMATION The Company operates in two reportable segments: • Trex Residential manufactures wood-alternative decking and residential railing and related products marketed under the brand name Trex ® • Trex Commercial designs, engineers, and markets modular and architectural railing and staging systems for the commercial and multi-family market, including sports stadiums and performing arts venues. Trex Commercial products are marketed to architects, specifiers, contractors, and others doing business within the commercial and multi-family market. The Company’s reportable segments have been determined in accordance with its internal management structure, which is organized based on residential and commercial sales activities. The Company evaluates performance of each segment primarily based on net sales and earnings before interest, income taxes, depreciation and amortization (EBITDA). The Company uses net sales to assess performance and allocate resources as this measure represents the amount of business the segment engaged in during a given period of time, is an indicator of market growth and acceptance of segment products, and represents the segment’s customers’ spending habits along with the amount of product the segment sells relative to its competitors. The Company uses EBITDA to assess performance and allocate resources because it believes that EBITDA facilitates performance comparison between the segments by eliminating interest, income taxes, and depreciation and amortization charges to income. The below segment data for the three and six months ended June 30, 2020 and 2019 includes data for Trex Residential and Trex Commercial (in thousands): Segment Data: Three Months Ended June 30, 2020 Three Months Ended June 30, 2019 Trex Residential Trex Total Trex Trex Total Net sales $ 208,877 $ 11,771 $ 220,648 $ 193,468 $ 12,985 $ 206,453 Net income $ 45,912 $ 1,306 $ 47,218 $ 35,223 $ 487 $ 35,710 EBITDA $ 65,495 $ 1,964 $ 67,459 $ 50,353 $ 785 $ 51,138 Depreciation and amortization $ 3,865 $ 198 $ 4,063 $ 3,258 $ 141 $ 3,399 Income tax expense $ 15,789 $ 460 $ 16,249 $ 11,866 $ 164 $ 12,030 Capital expenditures $ 39,610 $ 270 $ 39,880 $ 10,124 $ 290 $ 10,414 Total assets $ 577,684 $ 93,306 $ 670,990 $ 447,725 $ 88,473 $ 536,198 Reconciliation of Net Income to EBITDA: Three Months Ended June 30, 2020 Three Months Ended June 30, 2019 Trex Residential Trex Total Trex Trex Total Net income $ 45,912 $ 1,306 $ 47,218 $ 35,223 $ 487 $ 35,710 Interest (income) expense , net (71 ) — (71 ) 6 (7 ) (1 ) Income tax expense 15,789 460 16,249 11,866 164 12,030 Depreciation and amortization 3,865 198 4,063 3,258 141 3,399 EBITDA $ 65,495 $ 1,964 $ 67,459 $ 50,353 $ 785 $ 51,138 Segment Data: Six Months Ended June 30, 2020 Six Months Ended June 30, 2019 Trex Residential Trex Total Trex Trex Total Net sales $ 395,751 $ 25,292 $ 421,043 $ 358,947 $ 27,077 $ 386,024 Net income $ 86,932 $ 2,688 $ 89,620 $ 66,478 $ 787 $ 67,265 EBITDA $ 122,445 $ 4,001 $ 126,446 $ 92,419 $ 1,312 $ 93,731 Depreciation and amortization $ 7,529 $ 386 $ 7,915 $ 6,525 $ 268 $ 6,793 Income tax expense $ 28,577 $ 927 $ 29,504 $ 19,466 $ 264 $ 19,730 Capital expenditures $ 62,026 $ 587 $ 62,613 $ 17,818 $ 1,243 $ 19,061 Total assets $ 577,684 $ 93,306 $ 670,990 $ 447,725 $ 88,473 $ 536,198 Reconciliation of Net Income to EBITDA: Six Months Ended June 30, 2020 Six Months Ended June 30, 2019 Trex Residential Trex Total Trex Trex Total Net income $ 86,932 $ 2,688 $ 89,620 $ 66,478 $ 787 $ 67,265 Interest income, net (593 ) — (593 ) (50 ) (7 ) (57 ) Income tax expense 28,577 927 29,504 19,466 264 19,730 Depreciation and amortization 7,529 386 7,915 6,525 268 6,793 EBITDA $ 122,445 $ 4,001 $ 126,446 $ 92,419 $ 1,312 $ 93,731

Seasonality

Seasonality	6 Months Ended
	Jun. 30, 2020
Text Block [Abstract]
Seasonality	17. SEASONALITY The operating results for Trex Residential have historically varied from quarter to quarter. Seasonal, erratic or prolonged adverse weather conditions in certain geographic regions reduce the level of home improvement and construction activity and can shift demand for its products to a later period. As part of its normal business practice and consistent with industry practice, Trex Residential has historically offered incentive programs to its distributors and dealers to build inventory levels before the start of the prime deck-building season in order to ensure adequate availability of its product to meet anticipated seasonal consumer demand. The seasonal effects are often offset by the positive effect of the incentive programs. The operating results for Trex Commercial have not historically varied from quarter to quarter as a result of seasonality. However, they are driven by the timing of individual projects, which may vary each quarterly period.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2020
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	18. COMMITMENTS AND CONTINGENCIES Product Warranty The Company warrants that its decking and residential railing products will be free from material defects in workmanship and materials for warranty periods ranging from 10 years to 25 years, depending on the product and its use. If there is a breach of such warranties, the Company has an obligation either to replace the defective product or refund the purchase price. The Company continues to receive and settle claims for products manufactured at its Nevada facility prior to 2007 that exhibit surface flaking and maintains a warranty reserve to provide for the settlement of these claims. Estimating the warranty reserve for surface flaking claims requires management to estimate (1) the number of claims to be settled with payment and (2) the average cost to settle each claim. To estimate the number of claims to be settled with payment, the Company utilizes actuarial techniques to quantify both the expected number of claims to be received and the percentage of those claims that will ultimately require payment (collectively, elements). Estimates for these elements are quantified using a range of assumptions derived from claim count history and the identification of factors influencing the claim counts. The cost per claim varies due to a number of factors, including the size of affected decks, the availability and type of replacement material used, the cost of production of replacement material and the method of claim settlement. The Company monitors surface flaking claims activity each quarter for indications that its estimates require revision. Typically, a majority of surface flaking claims received in a year are received during the summer outdoor season, which spans the second and third quarters. It has been the Company’s practice to utilize the actuarial techniques discussed above during the third quarter, after a significant portion of all claims has been received for the fiscal year and variances to annual claims expectations are more meaningful. The number of incoming claims received in the six months ended June 30, 2020, was higher than the number of claims received in the six months ended June 30, 2019 and exceeded the Company’s expectations for the current year. Average settlement cost per claim experienced in the six months ended June 30, 2020, was considerably higher than that experienced in the six months ended June 30, 2019, due to an increase in larger claims settled and changes in the mix of settlement methods that occurred in the second half of 2019, but was consistent with the Company’s expectations for the current year and, and lower than that experienced for the full year ended December 31, 2019. The Company believes its reserve at June 30, 2020 is sufficient to cover future surface flaking obligations and no adjustments were required in the current period. The Company’s analysis is based on currently known facts and a number of assumptions, as discussed above, and current expectations. Projecting future events such as the number of claims to be received, the number of claims that will require payment and the average cost of claims could cause actual warranty liabilities to be higher or lower than those projected, which could materially affect the Company’s consolidated financial condition, results of operations or cash flows. The Company estimates that the annual number of claims received will continue to decline over time and that the average cost per claim will increase slightly, primarily due to inflation. If the level of claims received or average cost per claim differs materially from expectations, it could result in additional increases or decreases to the warranty reserve and a decrease or increase in earnings and cash flows in future periods. The Company estimates that a 10% change in the expected number of remaining claims to be settled with payment or the expected cost to settle claims may result in approximately a $1.7 million change in the surface flaking warranty reserve. The following is a reconciliation of the Company’s residential product warranty reserve (in thousands): Six Months Ended June 30, 2020 Surface Other Total Beginning balance, January 1 $ 19,024 $ 6,470 $ 25,494 Provisions and changes in estimates — 946 946 Settlements made during the period (1,700 ) (611 ) (2,311 ) Ending balance, June 30 $ 17,324 $ 6,805 $ 24,129 Six Months Ended June 30, 2019 Surface Other Total Beginning balance, January 1 $ 23,951 $ 6,803 $ 30,754 Provisions and changes in estimates — 1,312 1,312 Settlements made during the period (2,064 ) (666 ) (2,730 ) Ending balance, June 30 $ 21,887 $ 7,449 $ 29,336 Legal Matters The Company has lawsuits, as well as other claims, pending against it which are ordinary routine litigation and claims incidental to the business. Management has evaluated the merits of these lawsuits and claims, and believes that their ultimate resolution will not have a material effect on the Company’s consolidated financial condition, results of operations, liquidity or competitive position.

Summary of Significant Accounti

Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2020
Accounting Policies [Abstract]
Stock-Based Compensation	The Company has one stock-based compensation plan, the 2014 Stock Incentive Plan (Plan), approved by the Company’s stockholders in April 2014. The Plan amended and restated in its entirety the Trex Company, Inc. 2005 Stock Incentive Plan. The Plan was subsequently amended and restated by the Company’s Board of Directors in May 2014 and May 2018. The Plan is administered by the Compensation Committee of the Company’s Board of Directors. Stock-based compensation is granted to officers, directors and certain key employees in accordance with the provisions of the Plan. The Plan provides for grants of stock options, restricted stock, restricted stock units, stock appreciation rights (SARs), and unrestricted stock. The total aggregate number of shares of the Company’s common stock that may be issued under the Plan is 12,840,000 and as of June 30, 2020, the total number of shares available for future issuance is 5,642,795.

Inventories (Tables)

Inventories (Tables)	6 Months Ended
	Jun. 30, 2020
Inventory Disclosure [Abstract]
Summary of Inventories	Inventories valued at LIFO (last-in, first-out), June 30, December 31, Finished goods $ 31,764 $ 42,281 Raw materials 35,584 31,686 Total FIFO (first-in, first-out) 67,348 73,967 Reserve to adjust inventories to LIFO value (19,062 ) (19,062 ) Total LIFO inventories $ 48,286 $ 54,905 7

Prepaid Expenses and Other As_2

Prepaid Expenses and Other Assets (Tables)	6 Months Ended
	Jun. 30, 2020
Text Block [Abstract]
Summary of Prepaid Expenses and Other Assets	Prepaid expenses and other assets consist of the following (in thousands): June 30, 2020 December 31, Revenues in excess of billings $ 7,999 $ 8,282 Prepaid expenses 8,762 6,664 Contract retainage 2,097 1,832 Income tax receivable 53 2,675 Other 605 350 Total prepaid expenses and other assets $ 19,516 $ 19,803

Accrued Expenses and Other Li_2

Accrued Expenses and Other Liabilities (Tables)	6 Months Ended
	Jun. 30, 2020
Payables and Accruals [Abstract]
Summary of Accrued Expenses and Other Liabilities	Accrued expenses and other liabilities consist of the following (in thousands): June 30, December 31, Sales and marketing $ 26,319 $ 28,402 Income taxes 19,069 — Compensation and benefits 13,082 13,475 Operating lease liabilities 7,306 7,079 Manufacturing costs 2,677 2,564 Customer deposits 4,097 2,905 Billings in excess of revenues 1,423 816 Other 4,483 3,024 Total accrued expenses and other liabilities $ 78,456 $ 58,265 8

Debt (Tables)

Debt (Tables)	6 Months Ended
	Jun. 30, 2020
Debt Disclosure [Abstract]
Schedule of Debt	The Applicable Rate for Revolving B Commitments means the following percentages per annum, based upon the Consolidated Debt to Consolidated EBITDA Ratio as set forth in the most recent Compliance Certificate received by BOA as the Administrative Agent and as set forth in the New Credit Agreement: Pricing Tier Consolidated Debt to Eurodollar Rate Base Rate Loans Revolving B 1 > 2.50:1.00 2.75 % 1.75 % 0.60 % 2 < 2.50:1.00 2.50 % 1.50 % 0.55 % 3 < 2.00:1.00 but 2.25 % 1.25 % 0.50 % 4 < 1.50:1.00 1.80 % 0.80 % 0.45 %

Leases (Tables)

Leases (Tables)	6 Months Ended
	Jun. 30, 2020
Leases [Abstract]
Supplemental Cash Flow information and Supplemental balance sheet information related to operating leases to operating leases	The following table includes supplemental cash flow information for the six months ended June 30, 2020 and June 30, 2019 and supplemental balance sheet information at June 30, 2020 and December 31, 2019 related to operating leases (in thousands): Six Months Ended Supplemental cash flow information June 30, June 30, Cash paid for amounts included in the measurement of operating lease liabilities $ 4,258 $ 4,242 Operating ROU assets obtained in exchange for lease liabilities $ 290 $ 388 Supplemental balance sheet information June 30, 2020 December 31, Operating lease ROU assets $ 36,926 $ 40,049 Operating lease liabilities: Accrued expenses and other current liabilities $ 7,306 $ 7,079 Operating lease liabilities 30,776 34,242 Total operating lease liabilities $ 38,082 $ 41,321
Maturities of operating lease liabilities	The following table summarizes maturities of operating lease liabilities at June 30, 2020 (in thousands): Maturities of operating lease liabilities 2020 $ 4,284 2021 8,398 2022 6,530 2023 6,138 2024 6,158 Thereafter 11,079 Total lease payments 42,587 Less imputed interest (4,505 ) Total operating liabilities $ 38,082

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	6 Months Ended
	Jun. 30, 2020
Equity [Abstract]
Computation of Basic and Diluted Earnings Per Share	The following table sets forth the computation of basic and diluted earnings per share (in thousands, except share and per share data): Three Months Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 Numerator: Net income available to common shareholders $ 47,218 $ 35,710 $ 89,620 $ 67,265 Denominator: Basic weighted average shares outstanding 57,866,967 58,486,192 57,998,247 58,514,676 Effect of dilutive securities: Stock appreciation rights and options 89,871 129,839 90,297 141,958 Restricted stock 74,156 71,509 88,813 101,567 Diluted weighted average shares outstanding 58,030,994 58,687,540 58,177,357 58,758,201 Basic earnings per share $ 0.82 $ 0.61 $ 1.55 $ 1.15 Diluted earnings per share $ 0.81 $ 0.61 $ 1.54 $ 1.14
Antidilutive Securities Excluded from Computation of Earnings Per Share	The computation of diluted earnings per share excludes the following potentially dilutive securities because the effect would be anti-dilutive: Three Months Ended Six Months Ended 2020 2019 2020 2019 Stock appreciation rights 19,792 24,536 14,464 18,675

Revenue From Contracts With C_2

Revenue From Contracts With Customers (Tables)	6 Months Ended
	Jun. 30, 2020
Revenue from Contract with Customer [Abstract]
Summary of Disaggregated Net Sales	The tables also include a reconciliation of the respective disaggregated net sales with the Company’s reportable segments (in thousands). Three Months Ended June 30, 2020 Reportable Segment Trex Trex Residential Commercial Total Timing of Revenue Recognition and Type of Contract Products transferred at a point in time and variable consideration contracts $ 208,877 $ — $ 208,877 Products transferred over time and fixed price contracts — 11,771 11,771 $ 208,777 $ 11,771 $ 220,648 Six Months Ended June 30, 2020 Reportable Segment Trex Trex Residential Commercial Total Timing of Revenue Recognition and Type of Contract Products transferred at a point in time and variable consideration contracts $ 395,751 $ — $ 395,751 Products transferred over time and fixed price contracts — 25,292 25,292 $ 395,751 $ 25,292 $ 421,043 Three Months Ended June 30, 2019 Reportable Segment Trex Trex Residential Commercial Total Timing of Revenue Recognition and Type of Contract Products transferred at a point in time and variable consideration contracts $ 193,468 $ — $ 193,468 Products transferred over time and fixed price contracts — 12,985 12,985 $ 193,468 $ 12,985 $ 206,453 Six Months Ended June 30, 2019 Reportable Segment Trex Trex Residential Commercial Total Timing of Revenue Recognition and Type of Contract Products transferred at a point in time and variable consideration contracts $ 358,947 $ — $ 358,947 Products transferred over time and fixed price contracts — 27,077 27,077 $ 358,947 $ 27,077 $ 386,024

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	6 Months Ended
	Jun. 30, 2020
Summary of Stock-Based Compensation Grants	The following table summarizes the Company’s stock-based compensation grants for the six months ended June 30, 2020: Stock Awards Granted Weighted-Average Per Share Time-based restricted stock units 21,689 $ 99.95 Performance-based restricted stock units (a) 38,842 $ 78.64 Stock appreciation rights 21,643 $ 100.30 (a) Includes 26,652 of target performance-based restricted stock unit awards granted during the six months ended June 30, 2020, and adjustments of (2,562 )
Summary of Assumptions Used to Estimate Fair Value of Each SAR	For SARs issued in the six months ended June 30, 2020 and 2019 the data and assumptions shown in the following table were used: Six Months Ended June 30, 2020 Six Months Ended June 30, 2019 Weighted-average fair value of grants $ 35.37 $ 29.56 Dividend yield 0 % 0 % Average risk-free interest rate 1.3 % 2.5 % Expected term (years) 5 5 Expected volatility 38.2 % 39.1 %
Summary of Stock-Based Compensation Expense	The following table summarizes the Company’s stock-based compensation expense (in thousands): Three Months Ended Six Months Ended 2020 2019 2020 2019 Stock appreciation rights $ 96 $ 203 $ 450 $ 498 Time-based restricted stock and restricted stock units 671 1,306 1,928 2,455 Performance-based restricted stock and restricted stock units 562 569 1,695 1,883 Employee stock purchase plan 200 47 230 82 Total stock-based compensation $ 1,529 $ 2,125 $ 4,303 $ 4,918

Segment Information (Tables)

Segment Information (Tables)	6 Months Ended
	Jun. 30, 2020
Segment Reporting [Abstract]
Details of Segment Information	The below segment data for the three and six months ended June 30, 2020 and 2019 includes data for Trex Residential and Trex Commercial (in thousands): Segment Data: Three Months Ended June 30, 2020 Three Months Ended June 30, 2019 Trex Residential Trex Total Trex Trex Total Net sales $ 208,877 $ 11,771 $ 220,648 $ 193,468 $ 12,985 $ 206,453 Net income $ 45,912 $ 1,306 $ 47,218 $ 35,223 $ 487 $ 35,710 EBITDA $ 65,495 $ 1,964 $ 67,459 $ 50,353 $ 785 $ 51,138 Depreciation and amortization $ 3,865 $ 198 $ 4,063 $ 3,258 $ 141 $ 3,399 Income tax expense $ 15,789 $ 460 $ 16,249 $ 11,866 $ 164 $ 12,030 Capital expenditures $ 39,610 $ 270 $ 39,880 $ 10,124 $ 290 $ 10,414 Total assets $ 577,684 $ 93,306 $ 670,990 $ 447,725 $ 88,473 $ 536,198 Segment Data: Six Months Ended June 30, 2020 Six Months Ended June 30, 2019 Trex Residential Trex Total Trex Trex Total Net sales $ 395,751 $ 25,292 $ 421,043 $ 358,947 $ 27,077 $ 386,024 Net income $ 86,932 $ 2,688 $ 89,620 $ 66,478 $ 787 $ 67,265 EBITDA $ 122,445 $ 4,001 $ 126,446 $ 92,419 $ 1,312 $ 93,731 Depreciation and amortization $ 7,529 $ 386 $ 7,915 $ 6,525 $ 268 $ 6,793 Income tax expense $ 28,577 $ 927 $ 29,504 $ 19,466 $ 264 $ 19,730 Capital expenditures $ 62,026 $ 587 $ 62,613 $ 17,818 $ 1,243 $ 19,061 Total assets $ 577,684 $ 93,306 $ 670,990 $ 447,725 $ 88,473 $ 536,198
Schedule of Reconciliation of Net Income to EBITDA	Reconciliation of Net Income to EBITDA: Three Months Ended June 30, 2020 Three Months Ended June 30, 2019 Trex Residential Trex Total Trex Trex Total Net income $ 45,912 $ 1,306 $ 47,218 $ 35,223 $ 487 $ 35,710 Interest (income) expense , net (71 ) — (71 ) 6 (7 ) (1 ) Income tax expense 15,789 460 16,249 11,866 164 12,030 Depreciation and amortization 3,865 198 4,063 3,258 141 3,399 EBITDA $ 65,495 $ 1,964 $ 67,459 $ 50,353 $ 785 $ 51,138 15 Reconciliation of Net Income to EBITDA: Six Months Ended June 30, 2020 Six Months Ended June 30, 2019 Trex Residential Trex Total Trex Trex Total Net income $ 86,932 $ 2,688 $ 89,620 $ 66,478 $ 787 $ 67,265 Interest income, net (593 ) — (593 ) (50 ) (7 ) (57 ) Income tax expense 28,577 927 29,504 19,466 264 19,730 Depreciation and amortization 7,529 386 7,915 6,525 268 6,793 EBITDA $ 122,445 $ 4,001 $ 126,446 $ 92,419 $ 1,312 $ 93,731

Commitments and Contingencies (

Commitments and Contingencies (Tables)	6 Months Ended
	Jun. 30, 2020
Commitments and Contingencies Disclosure [Abstract]
Summary of Reconciliation of Company's Residential Product Warranty Reserve	The following is a reconciliation of the Company’s residential product warranty reserve (in thousands): Six Months Ended June 30, 2020 Surface Other Total Beginning balance, January 1 $ 19,024 $ 6,470 $ 25,494 Provisions and changes in estimates — 946 946 Settlements made during the period (1,700 ) (611 ) (2,311 ) Ending balance, June 30 $ 17,324 $ 6,805 $ 24,129 Six Months Ended June 30, 2019 Surface Other Total Beginning balance, January 1 $ 23,951 $ 6,803 $ 30,754 Provisions and changes in estimates — 1,312 1,312 Settlements made during the period (2,064 ) (666 ) (2,730 ) Ending balance, June 30 $ 21,887 $ 7,449 $ 29,336

Business and Organization - Add

Business and Organization - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2020Segment
Accounting Policies [Abstract]
Number of reportable segments	2

Inventories - Summary of Invent

Inventories - Summary of Inventories (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Inventory Disclosure [Abstract]
Finished goods	$ 31,764	$ 42,281
Raw materials	35,584	31,686
Total FIFO inventories	67,348	73,967
Reserve to adjust inventories to LIFO value	(19,062)	(19,062)
Total LIFO inventories	$ 48,286	$ 54,905

Inventories - Additional Inform

Inventories - Additional Information (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Inventory Disclosure [Abstract]
LIFO inventory liquidations	$ 0
Raw materials	$ 1,400	$ 1,200

Prepaid Expenses and Other As_3

Prepaid Expenses and Other Assets - Summary of Prepaid Expenses and Other Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Prepaid Expense and Other Assets [Abstract]
Revenues in excess of billings	$ 7,999	$ 8,282
Prepaid expenses	8,762	6,664
Contract retainage	2,097	1,832
Income tax receivable	53	2,675
Other	605	350
Total prepaid expenses and other assets	$ 19,516	$ 19,803

Goodwill and Other Intangible_2

Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Goodwill [Line Items]
Amortization of intangible asset	$ 0.2	$ 0.2
Intangible Assets	6.3		$ 6.3
Accumulated Amortization	0.9		0.7
Commercial [Member]
Goodwill [Line Items]
Goodwill			$ 54.3
Residential [Member]
Goodwill [Line Items]
Goodwill	$ 14.2
Domain Names [Member]
Goodwill [Line Items]
Amortization period	15 years

Accrued Expenses and Other Li_3

Accrued Expenses and Other Liabilities - Summary of Accrued Expenses and Other Liabilities (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Payables and Accruals [Abstract]
Sales and marketing	$ 26,319	$ 28,402
Income taxes	19,069
Compensation and benefits	13,082	13,475
Operating lease liabilities	7,306	7,079
Manufacturing costs	2,677	2,564
Customer deposits	4,097	2,905
Billings in excess of revenues	1,423	816
Other	4,483	3,024
Total accrued expenses and other liabilities	$ 78,456	$ 58,265

Debt - Schedule Of Debt (Detail

Debt - Schedule Of Debt (Detail)	6 Months Ended
	Jun. 30, 2020
Pricing Tier One [Member]
Line of Credit Facility [Line Items]
Consolidated Debt to Consolidated EBITDA Ratio	> 2.50:1.00
Revolving B Commitment Fee	0.60%
Pricing Tier Two [Member]
Line of Credit Facility [Line Items]
Consolidated Debt to Consolidated EBITDA Ratio	< 2.50:1.00 but > 2.00:1.00
Revolving B Commitment Fee	0.55%
Pricing Tier Three [Member]
Line of Credit Facility [Line Items]
Consolidated Debt to Consolidated EBITDA Ratio	< 2.50:1.00 but > 2.00:1.00
Revolving B Commitment Fee	0.50%
Pricing Tier Four [Member]
Line of Credit Facility [Line Items]
Consolidated Debt to Consolidated EBITDA Ratio	< 1.50:1.00
Revolving B Commitment Fee	0.45%
London Interbank Offered Rate (LIBOR) [Member] | Pricing Tier One [Member]
Line of Credit Facility [Line Items]
Eurodollar Rate Loans / LIBOR Index	2.75%
London Interbank Offered Rate (LIBOR) [Member] | Pricing Tier Two [Member]
Line of Credit Facility [Line Items]
Eurodollar Rate Loans / LIBOR Index	2.50%
London Interbank Offered Rate (LIBOR) [Member] | Pricing Tier Three [Member]
Line of Credit Facility [Line Items]
Eurodollar Rate Loans / LIBOR Index	2.25%
London Interbank Offered Rate (LIBOR) [Member] | Pricing Tier Four [Member]
Line of Credit Facility [Line Items]
Eurodollar Rate Loans / LIBOR Index	1.80%
Base Rate [Member] | Pricing Tier One [Member]
Line of Credit Facility [Line Items]
Base Rate Loans	1.75%
Base Rate [Member] | Pricing Tier Two [Member]
Line of Credit Facility [Line Items]
Base Rate Loans	1.50%
Base Rate [Member] | Pricing Tier Three [Member]
Line of Credit Facility [Line Items]
Base Rate Loans	1.25%
Base Rate [Member] | Pricing Tier Four [Member]
Line of Credit Facility [Line Items]
Base Rate Loans	0.80%

Debt - Additional Information (

Debt - Additional Information (Detail) - USD ($)	May 26, 2020	Jun. 30, 2020	Dec. 31, 2020
Line of Credit Facility [Line Items]
Outstanding borrowing capacity		$ 0
Remaining available borrowing capacity		$ 350,000,000	$ 300,000,000
Federal Funds Rate [Member]
Line of Credit Facility [Line Items]
Interest rate	0.50%
Eurodollar Rate Loans [Member]
Line of Credit Facility [Line Items]
Interest rate	1.00%
Fourth Amended And Restated Credit Agreement [Member]
Line of Credit Facility [Line Items]
Termination date of the Credit Agreement		Nov. 5, 2024
Revolver Loans Portion Effective January 1 through June 30 [Member] | Fourth Amended And Restated Credit Agreement [Member]
Line of Credit Facility [Line Items]
Revolving loans in a collective maximum principal amount		$ 250,000,000
Revolver Loans Portion Effective July 1 through December 31 [Member] | Fourth Amended And Restated Credit Agreement [Member]
Line of Credit Facility [Line Items]
Revolving loans in a collective maximum principal amount		$ 200,000,000
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Additional Borrowing Capacity	$ 100,000,000
Revolving Credit Facility [Member] | BOA [Member]
Line of Credit Facility [Line Items]
Lender Percentage	47.50%
Revolving Credit Facility [Member] | Well Fargo [Member]
Line of Credit Facility [Line Items]
Lender Percentage	28.00%
Revolving Credit Facility [Member] | Regions [Member]
Line of Credit Facility [Line Items]
Lender Percentage	24.50%

Leases - Additional Information

Leases - Additional Information (Detail) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Weighted average discount rate	3.64%		3.66%
Operating lease cost	$ 4.3	$ 4.2
Weighted average remaining lease term	6 years		6 years 6 months
Minimum [Member]
Operating Lease terms	1 year
Maximum [Member]
Operating Lease terms	8 years

Leases - Supplemental Cash flow

Leases - Supplemental Cash flow Information to operating leases (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Supplemental cash flow information
Cash paid for amounts included in the measurement of operating lease liabilities	$ 4,258	$ 4,242
Operating ROU assets obtained in exchange for lease liabilities	290	$ 388
Supplemental balance sheet information
Operating lease ROU assets	36,926		$ 40,049
Operating lease liabilities:
Accrued expenses and other current liabilities	7,306		7,079
Operating lease liabilities	30,776		34,242
Total operating lease liabilities	$ 38,082		$ 41,321

Leases - Maturities of Operatin

Leases - Maturities of Operating Lease Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Operating Lease Liabilities, Payments Due [Abstract]
2020	$ 4,284
2021	8,398
2022	6,530
2023	6,138
2024	6,158
Thereafter	11,079
Total lease payments	42,587
Less imputed interest	(4,505)
Total operating liabilities	$ 38,082	$ 41,321

Stockholders' Equity - Addition

Stockholders' Equity - Additional Information (Detail) - $ / shares	Jul. 29, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2019	Jun. 30, 2020	Apr. 29, 2020	Feb. 19, 2020
Equity, Class of Treasury Stock [Line Items]
Common stock, shares authorized					180,000,000	180,000,000	180,000,000	120,000,000
Common stock, par value	$ 0.01				$ 0.01	$ 0.01
Common Stock [Member]
Equity, Class of Treasury Stock [Line Items]
Number of shares repurchased by the Company		442,009	125,151	124,989
Description of stock split	two-for-one stock split
Stock Repurchase Programs [Member]
Equity, Class of Treasury Stock [Line Items]
Common stock repurchase program, authorized shares						5,800,000
Number of shares repurchased by the Company					1,400,000

Stockholders' Equity - Computat

Stockholders' Equity - Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Numerator:
Net income available to common shareholders	$ 47,218	$ 42,402	$ 35,710	$ 31,555	$ 89,620	$ 67,265
Denominator:
Basic weighted average shares outstanding	57,866,967		58,486,192		57,998,247	58,514,676
Effect of dilutive securities:
Diluted weighted average shares outstanding	58,030,994		58,687,540		58,177,357	58,758,201
Basic earnings per share	$ 0.82		$ 0.61		$ 1.55	$ 1.15
Diluted earnings per share	$ 0.81		$ 0.61		$ 1.54	$ 1.14
Stock appreciation rights and options [Member]
Effect of dilutive securities:
Dilutive securities	89,871		129,839		90,297	141,958
Restricted stock [Member]
Effect of dilutive securities:
Dilutive securities	74,156		71,509		88,813	101,567

Stockholders' Equity - Antidilu

Stockholders' Equity - Antidilutive Securities Excluded from Computation of Earnings Per Share (Detail) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Stock appreciation rights [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from the computation of diluted earnings per share	19,792	24,536	14,464	18,675

Revenue From Contracts With C_3

Revenue From Contracts With Customers - Additional Information (Detail) $ in Millions	3 Months Ended
	Jun. 30, 2020USD ($)
Revenue from Contract with Customer [Abstract]
Revenue remaining performance obligation	$ 63.7
Revenue remaining performance obligation description	greater than one year

Revenue From Contracts With C_4

Revenue From Contracts With Customers - Summary of Disaggregated Net Sales (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Revenue from contract with customers	$ 220,648	$ 206,453	$ 421,043	$ 386,024
Products Transferred at a Point in Time and Variable Consideration Contracts [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customers	208,877	193,468	395,751	358,947
Products Transferred Over Time and Fixed Price Contracts [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customers	11,771	12,985	25,292	27,077
Residential [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customers	208,777	193,468	395,751	358,947
Residential [Member] | Products Transferred at a Point in Time and Variable Consideration Contracts [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customers	208,877	193,468	395,751	358,947
Residential [Member] | Products Transferred Over Time and Fixed Price Contracts [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customers	0		0
Commercial [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customers	11,771	12,985	25,292	27,077
Commercial [Member] | Products Transferred at a Point in Time and Variable Consideration Contracts [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customers	0		0
Commercial [Member] | Products Transferred Over Time and Fixed Price Contracts [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customers	$ 11,771	$ 12,985	$ 25,292	$ 27,077

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2020USD ($)shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to unvested awards | $	$ 6.8
2014 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total aggregate number of shares of common stock that may be issued	12,840,000
Number of common stock available for future issuance	5,642,795
Stock Appreciation Rights [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value assumptions method used	Black-Scholes option-pricing formula

Stock-Based Compensation - Summ

Stock-Based Compensation - Summary of Stock-Based Compensation Expenses (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 1,529	$ 2,125	$ 4,303	$ 4,918
Stock Appreciation Rights [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	96	203	450	498
Time-Based Restricted Stock and Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	671	1,306	1,928	2,455
Performance-Based Restricted Stock and Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	562	569	1,695	1,883
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 200	$ 47	$ 230	$ 82

Stock-Based Compensation - Su_2

Stock-Based Compensation - Summary of Assumptions Used to Estimate Fair Value of Each SAR (Detail) - Stock Appreciation Rights [Member] - $ / shares	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Share Based Compensation Arrangement by Share Based Payment Award Fair Value Assumptions and Methodology [Line Items]
Weighted-average fair value of grants	$ 35.37	$ 29.56
Dividend yield	0.00%	0.00%
Average risk-free interest rate	1.30%	2.50%
Expected term (years)	5 years	5 years
Expected volatility	38.20%	39.10%

Stock-Based Compensation - Su_3

Stock-Based Compensation - Summary of Stock-Based Compensation Grants (Detail)	6 Months Ended
	Jun. 30, 2020$ / sharesshares
Time Based Restricted Stock Units [Member]
Stock Awards Granted | shares	21,689
Weighted-Average Grant Price Per Share | $ / shares	$ 99.95
Performance Based Restricted Stock Units [Member]
Stock Awards Granted | shares	38,842	[1]
Weighted-Average Grant Price Per Share | $ / shares	$ 78.64	[1]
Stock Appreciation Rights [Member]
Stock Awards Granted | shares	21,643
Weighted-Average Grant Price Per Share | $ / shares	$ 100.30
[1]	Includes 26,652 of target performance-based restricted stock unit awards granted during the six months ended June 30, 2020, and adjustments of (2,562), 3,029 and 11,723 to grants due to the actual performance level achieved for restricted stock and restricted stock units awarded in 2019, 2018, and 2017, respectively.

Stock-Based Compensation - Su_4

Stock-Based Compensation - Summary of Stock-Based Compensation Grants (Parenthetical) (Detail) - shares	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Performance Based Restricted Stock Unit Target [Member]
Stock Awards Granted	26,652
Performance Based Restricted Stock Unit Adjustment [Member]
Stock Awards Granted		2,562	3,029	11,723

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Tax Contingency [Line Items]
Valuation allowance	$ 3,000		$ 3,000
Income tax expense (benefit)	$ 16,249	$ 12,030	$ 29,504	$ 19,730
Effective tax rate			24.80%	22.70%
Increase in effective tax rate due to decrease in domestic production activities deduction			2.10%
Excess tax benefits from stock based awards			$ 1,100	$ 2,600
Earliest Tax Year [Member] | Federal Tax Jurisdiction [Member]
Income Tax Contingency [Line Items]
Tax years subject to examination			2016
Latest Tax Year [Member] | Federal Tax Jurisdiction [Member]
Income Tax Contingency [Line Items]
Tax years subject to examination			2019

Segment Information - Additiona

Segment Information - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2020Segment
Segment Reporting Information [Line Items]
Number of reportable segment	2

Segment Information - Details o

Segment Information - Details of Segment Information (Detail) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Segment Reporting Information [Line Items]
Net sales	$ 220,648		$ 206,453		$ 421,043	$ 386,024
Net income	47,218	$ 42,402	35,710	$ 31,555	89,620	67,265
Depreciation and amortization					7,915	6,792
Income tax expense	16,249		12,030		29,504	19,730
Total Assets	670,990				670,990		$ 592,239
Residential [Member]
Segment Reporting Information [Line Items]
Net sales	208,777		193,468		395,751	358,947
Commercial [Member]
Segment Reporting Information [Line Items]
Net sales	11,771		12,985		25,292	27,077
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales	220,648		206,453		421,043	386,024
Net income	47,218		35,710		89,620	67,265
EBITDA	67,459		51,138		126,446	93,731
Depreciation and amortization	4,063		3,399		7,915	6,793
Income tax expense	16,249		12,030		29,504	19,730
Capital expenditures	39,880		10,414		62,613	19,061
Total Assets	670,990		536,198		670,990	536,198
Operating Segments [Member] | Residential [Member]
Segment Reporting Information [Line Items]
Net sales	208,877		193,468		395,751	358,947
Net income	45,912		35,223		86,932	66,478
EBITDA	65,495		50,353		122,445	92,419
Depreciation and amortization	3,865		3,258		7,529	6,525
Income tax expense	15,789		11,866		28,577	19,466
Capital expenditures	39,610		10,124		62,026	17,818
Total Assets	577,684		447,725		577,684	447,725
Operating Segments [Member] | Commercial [Member]
Segment Reporting Information [Line Items]
Net sales	11,771		12,985		25,292	27,077
Net income	1,306		487		2,688	787
EBITDA	1,964		785		4,001	1,312
Depreciation and amortization	198		141		386	268
Income tax expense	460		164		927	264
Capital expenditures	270		290		587	1,243
Total Assets	$ 93,306		$ 88,473		$ 93,306	$ 88,473

Segment Information - Schedule

Segment Information - Schedule of Reconciliation of Net Income to EBITDA (Detail) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting Information [Line Items]
Net income	$ 47,218	$ 42,402	$ 35,710	$ 31,555	$ 89,620	$ 67,265
Interest (income) expense, net	(71)		(1)		(593)	(57)
Income tax expense	16,249		12,030		29,504	19,730
Depreciation and Amortization					7,915	6,792
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net income	47,218		35,710		89,620	67,265
Interest (income) expense, net	(71)		(1)		(593)	(57)
Income tax expense	16,249		12,030		29,504	19,730
Depreciation and Amortization	4,063		3,399		7,915	6,793
EBITDA	67,459		51,138		126,446	93,731
Operating Segments [Member] | Residential [Member]
Segment Reporting Information [Line Items]
Net income	45,912		35,223		86,932	66,478
Interest (income) expense, net	(71)		6		(593)	(50)
Income tax expense	15,789		11,866		28,577	19,466
Depreciation and Amortization	3,865		3,258		7,529	6,525
EBITDA	65,495		50,353		122,445	92,419
Operating Segments [Member] | Commercial [Member]
Segment Reporting Information [Line Items]
Net income	1,306		487		2,688	787
Interest (income) expense, net			(7)			(7)
Income tax expense	460		164		927	264
Depreciation and Amortization	198		141		386	268
EBITDA	$ 1,964		$ 785		$ 4,001	$ 1,312

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2020USD ($)
Schedule Of Commitments And Contingencies [Line Items]
Change in warranty reserve for disclosure purposes only	$ 1.7
Minimum [Member]
Schedule Of Commitments And Contingencies [Line Items]
Warranty period	10 years
Maximum [Member]
Schedule Of Commitments And Contingencies [Line Items]
Warranty period	25 years
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%

Commitments and Contingencies_2

Commitments and Contingencies - Summary of Reconciliation of Company's Residential Product Warranty Reserve (Detail) - Surface Flaking Warranty Reserve [Member] - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Product Warranty Liability [Line Items]
Beginning balance	$ 25,494	$ 30,754
Provisions and changes in estimates	946	1,312
Settlements made during the period	(2,311)	(2,730)
Ending balance	24,129	29,336
Surface Flaking [Member]
Product Warranty Liability [Line Items]
Beginning balance	19,024	23,951
Settlements made during the period	(1,700)	(2,064)
Ending balance	17,324	21,887
Other Residential [Member]
Product Warranty Liability [Line Items]
Beginning balance	6,470	6,803
Provisions and changes in estimates	946	1,312
Settlements made during the period	(611)	(666)
Ending balance	$ 6,805	$ 7,449