NVR (NVR) 10-Q31 Oct 182018 Q3 Quarterly reportFinancial data

Company Profile

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
Document and Entity Information - shares	Sep. 30, 2018	Oct. 26, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q3
Trading Symbol	NVR
Entity Registrant Name	NVR INC
Entity Central Index Key	906,163
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		3,614,947
Entity Emerging Growth Company	false
Entity Small Business	false

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Inventory:
Land under development	$ 36,064
Contract land deposits, net	374,350	$ 370,429
Total assets	3,089,823	2,989,279
LIABILITIES AND SHAREHOLDERS' EQUITY
Total liabilities	1,407,507	1,383,787
Commitments and contingencies
Shareholders' equity:
Common stock, $0.01 par value; 60,000,000 shares authorized; 20,555,330 shares issued as of both September 30, 2018 and December 31, 2017	206	206
Additional paid-in capital	1,762,323	1,644,197
Deferred compensation trust – 107,336 and 108,640 shares of NVR, Inc. common stock as of September 30, 2018 and December 31, 2017, respectively	(16,928)	(17,383)
Deferred compensation liability	16,928	17,383
Retained earnings	6,799,175	6,231,940
Less treasury stock at cost – 16,960,261 and 16,864,324 shares as of September 30, 2018 and December 31, 2017, respectively	(6,879,388)	(6,270,851)
Total shareholders' equity	1,682,316	1,605,492
Total liabilities and shareholders' equity	3,089,823	2,989,279
Home Building [Member]
ASSETS
Cash and cash equivalents	598,789	645,087
Restricted cash	19,194	19,438
Receivables	26,363	20,026
Inventory:
Lots and housing units, covered under sales agreements with customers	1,263,588	1,046,094
Unsold lots and housing units	102,794	148,620
Land under development	36,064	34,212
Building materials and other	18,624	17,273
Total Inventory	1,421,070	1,246,199
Contract land deposits, net	374,350	370,429
Property, plant and equipment, net	42,399	43,191
Reorganization value in excess of amounts allocable to identifiable assets, net	41,580	41,580
Other assets	192,869	198,930
Total assets	2,716,614	2,584,880
LIABILITIES AND SHAREHOLDERS' EQUITY
Accounts payable	283,762	261,973
Accrued expenses and other liabilities	322,560	341,891
Customer deposits	167,676	150,033
Senior notes	597,527	597,066
Total liabilities	1,371,525	1,350,963
Mortgage Banking [Member]
ASSETS
Cash and cash equivalents	11,081	21,707
Restricted cash	3,151	2,256
Mortgage loans held for sale, net	322,944	352,489
Inventory:
Property, plant and equipment, net	6,763	6,327
Reorganization value in excess of amounts allocable to identifiable assets, net	7,347	7,347
Other assets	21,923	14,273
Total assets	373,209	404,399
LIABILITIES AND SHAREHOLDERS' EQUITY
Accounts payable and other liabilities	35,982	32,824
Total liabilities	$ 35,982	$ 32,824

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Sep. 30, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Common stock, par value (USD per share)	$ 0.01	$ 0.01
Common stock, shares authorized	60,000,000	60,000,000
Common stock, shares issued	20,555,330	20,555,330
Deferred compensation trust, shares	107,904	108,640
Treasury stock, shares	16,926,815	16,864,324

Condensed Consolidated Statemen

Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenues	$ 1,852,407	$ 1,667,920	$ 5,169,126	$ 4,489,504
Interest expense	(6,197)	(6,120)	(18,808)	(17,870)
Income before taxes	249,710	244,464	682,294	585,593
Income tax expense	(53,894)	(82,362)	(117,255)	(172,691)
Net income	$ 195,816	$ 162,102	$ 565,039	$ 412,902
Basic earnings per share (USD per share)	$ 54.21	$ 43.26	$ 155.22	$ 110.60
Diluted earnings per share (USD per share)	$ 48.28	$ 38.02	$ 136.53	$ 98.33
Basic weighted average shares outstanding (in shares)	3,612	3,747	3,640	3,733
Diluted weighted average shares outstanding (in shares)	4,056	4,263	4,139	4,199
Home Building [Member]
Revenues	$ 1,809,345	$ 1,633,726	$ 5,049,901	$ 4,394,027
Other income	2,840	1,715	6,981	4,264
Cost of Goods and Services Sold	1,472,649	1,307,971	4,101,392	3,552,071
Selling, general and administrative	(109,372)	(95,606)	(321,436)	(294,610)
Operating income	230,164	231,864	634,054	551,610
Interest expense	(5,968)	(5,821)	(18,022)	(17,040)
Income before taxes	224,196	226,043	616,032	534,570
Mortgage Banking [Member]
Revenues	43,062	34,194	119,225	95,477
Interest income	3,362	1,953	8,370	5,168
Other income	659	583	1,824	1,398
General and administrative	(21,340)	(18,010)	(62,371)	(50,190)
Interest expense	(229)	(299)	(786)	(830)
Income before taxes	$ 25,514	$ 18,421	$ 66,262	$ 51,023

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities:
Net income	$ 565,039	$ 412,902
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	15,053	17,087
Equity-based compensation expense	51,690	32,678
Contract land deposit and other impairments, net	9,311	3,396
Gain on sale of loans, net	(92,609)	(73,372)
Mortgage loans closed	(3,472,345)	(2,860,903)
Mortgage loans sold and principal payments on mortgage loans held for sale	3,588,082	3,033,239
Distribution of earnings from unconsolidated joint ventures	3,863	3,536
Net change in assets and liabilities:
Increase in inventory	(174,871)	(284,459)
(Increase) decrease in contract land deposits	(6,587)	11,306
(Increase) decrease in receivables	(7,028)	36
Increase in accounts payable and accrued expenses	1,201	15,109
Increase in customer deposits	17,643	40,049
Other, net	(6,627)	(14,958)
Net cash provided by operating activities	491,815	335,646
Cash flows from investing activities:
Investments in and advances to unconsolidated joint ventures	(284)	(455)
Distribution of capital from unconsolidated joint ventures	7,873	7,665
Purchase of property, plant and equipment	(14,818)	(15,670)
Proceeds from the sale of property, plant and equipment	742	664
Net cash used in investing activities	(6,487)	(7,796)
Cash flows from financing activities:
Purchase of treasury stock	(657,369)	(230,199)
Payments to Noncontrolling Interests	234	0
Proceeds from the exercise of stock options	115,268	130,245
Net cash used in financing activities	(542,335)	(99,954)
Net (decrease) increase in cash, restricted cash, and cash equivalents	(57,007)	227,896
Cash, restricted cash, and cash equivalents, beginning of the period	689,557	416,037
Cash, restricted cash, and cash equivalents, end of the period	632,550	643,933
Supplemental disclosures of cash flow information:
Interest paid during the period, net of interest capitalized	24,066	23,112
Income taxes paid during the period, net of refunds	$ 125,762	$ 169,949

Basis of Presentation

Basis of Presentation	9 Months Ended
Basis of Presentation	Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited, condensed consolidated financial statements include the accounts of NVR, Inc. (“NVR” or the “Company”) and its subsidiaries and certain other entities in which the Company is deemed to be the primary beneficiary (see Notes 2 and 3 to the accompanying condensed consolidated financial statements). Intercompany accounts and transactions have been eliminated in consolidation. The statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. Because the accompanying condensed consolidated financial statements do not include all of the information and footnotes required by GAAP, they should be read in conjunction with the financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017 . In the opinion of management, all adjustments (consisting only of normal recurring accruals except as otherwise noted herein) considered necessary for a fair presentation have been included. Operating results for the three and nine months ended September 30, 2018 are not necessarily indicative of the results that may be expected for the year ending December 31, 2018 . The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates. Certain prior period amounts in the condensed consolidated statements of cash flows have been reclassified to conform to current period presentation. These reclassifications did not impact total cash from operating, investing or financing activities in the statement of cash flows. For the three and nine months ended September 30, 2018 and 2017 , comprehensive income equaled net income; therefore, a separate statement of comprehensive income is not included in the accompanying condensed consolidated financial statements. Recently Adopted Accounting Pronouncements Revenue from Contracts with Customers On January 1, 2018, the Company adopted Accounting Standards Update 2014-09, Revenue from Contracts with Customers (Topic 606) , using the modified retrospective method applied to those contracts which were not completed as of January 1, 2018. Revenue Recognition Consistent with the Company’s previous revenue recognition practice, homebuilding revenue is recognized on the settlement date at the contract sales price, when control is transferred to our customers. Mortgage banking revenue recognition will continue to be governed by Accounting Standards Codification ("ASC") Topic 815 - Derivatives and Hedging and ASC Topic 825 - Financial Instruments, and is not subject to Topic 606. See Note 10 for disclosure of revenue by reporting segment. The Company’s contract liabilities, consisting of deposits received from customers (“Handmoney”) on homes not settled, were $167,676 and $172,033 as of September 30, 2018 and June 30, 2018, respectively. During the third quarter of 2018, the Company recognized in revenue approximately $91,000 of the Handmoney held as of June 30, 2018. For the nine month period ended September 30, 2018, the Company recognized substantially all of the $150,033 in Handmoney held as of December 31, 2017. The Company’s prepaid sales compensation totaled approximately $21,500 and $19,500 , as of September 30, 2018 and December 31, 2017 , respectively. These amounts are included in homebuilding “Other assets” on the accompanying condensed consolidated balance sheets. Deferred Revenue Topic 606 no longer requires sellers of real estate to consider the initial and continuing involvement criteria in ASC 360-20, but instead only conclude on the collectibility of the transaction price. On January 1, 2018, the Company recorded a cumulative-effect adjustment, net of tax, of $2,196 to recognize deferred profit on home settlements for which the Company had previously determined that there was significant continuing involvement and believed to be fully collectible. Practical Expedients and Exemption At contract inception, the performance obligation to complete and settle the home with a customer has an expected duration of less than one year. As a result, the Company does not disclose the value of unsatisfied performance obligations for contracts. No other adjustments were made as a result of the adoption of Topic 606. Other recently adopted accounting pronouncements The Company adopted ASU 2016-15, Classification of Certain Cash Receipts and Cash Payments, effective January 1, 2018. In connection with the adoption of ASU 2016-15, the Company made the election to classify distributions received from unconsolidated joint ventures using the cumulative earnings approach. This election was applied retrospectively, which reclassified a portion of distributions received from the Company's unconsolidated joint ventures between operating and investing activities on the prior year condensed consolidated statement of cash flows. The adoption of this standard did not have a material effect on the Company's condensed consolidated statements of cash flows and related disclosures. The Company adopted ASU 2016-18, Statement of Cash Flows (Topic 230), Restricted Cash, effective January 1, 2018. The amendments in the standard require that the statement of cash flows explain the change during the period in the total of cash, cash equivalents and restricted cash or restricted cash equivalents. As a result, the Company's beginning-of-period and end-of-period cash balances presented in the condensed consolidated statements of cash flows were retrospectively adjusted to include restricted cash with cash and cash equivalents. The Company's cash and cash equivalents include short-term investments with original maturities of three months or less. Homebuilding restricted cash was attributable to customer deposits for certain home sales. Mortgage banking restricted cash included amounts collected from customers for loans in process and closed mortgage loans held for sale. The beginning-of-period and end-of-period cash, restricted cash, and cash equivalent balances presented on the accompanying condensed consolidated statements of cash flows include cash related to a consolidated joint venture, which is included in homebuilding "Other assets" on the Company's condensed consolidated balance sheets. The cash related to this consolidated joint venture as of September 30, 2018 and December 31, 2017 was $335 and $1,069 , respectively, and as of September 30, 2017 and December 31, 2016 was $1,177 and $1,214 , respectively. The adoption of this standard did not have a material effect on the Company's condensed consolidated statements of cash flows and related disclosures. The Company also adopted ASU 2017-09, Compensation – Stock Compensation (Topic 718), Scope of Modification Accounting, effective January 1, 2018. The amendments in the standard clarify when changes in a share-based payment award must be accounted for as a modification, and will allow entities to make certain changes to share-based payment awards without accounting for them as modifications. Under the new guidance, entities will only apply modification accounting if there are substantive changes made to share-based payment awards. If a change made to a share-based payment award does not affect the fair value, vesting conditions and classification as either an equity or liability instrument, modification accounting will not need to be applied. The adoption of this standard did not have any effect on the Company's condensed consolidated financial statements and related disclosures.

Variable Interest Entities ("VI

Variable Interest Entities ("VIEs")	9 Months Ended
Variable Interest Entities ("VIEs")	Sep. 30, 2018
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure [Abstract]
Variable Interest Entities	Variable Interest Entities ("VIEs") Fixed Price Finished Lot Purchase Agreements (“Lot Purchase Agreements”) NVR generally does not engage in the land development business. Instead, the Company typically acquires finished building lots at market prices from various development entities under Lot Purchase Agreements. The Lot Purchase Agreements require deposits that may be forfeited if NVR fails to perform under the Lot Purchase Agreements. The deposits required under the Lot Purchase Agreements are in the form of cash or letters of credit in varying amounts, and typically range up to 10% of the aggregate purchase price of the finished lots. NVR believes this lot acquisition strategy reduces the financial requirements and risks associated with direct land ownership and land development. NVR may, at its option, choose for any reason and at any time not to perform under these Lot Purchase Agreements by delivering notice of its intent not to acquire the finished lots under contract. NVR’s sole legal obligation and economic loss for failure to perform under these Lot Purchase Agreements is limited to the amount of the deposit pursuant to the liquidated damage provisions contained within the Lot Purchase Agreements. None of the creditors of any of the development entities with which NVR enters Lot Purchase Agreements have recourse to the general credit of NVR. NVR generally does not have any specific performance obligations to purchase a certain number or any of the lots, nor does NVR guarantee completion of the development by the developer or guarantee any of the developers’ financial or other liabilities. NVR is not involved in the design or creation of the development entities from which the Company purchases lots under Lot Purchase Agreements. The developer’s equity holders have the power to direct 100% of the operating activities of the development entity. NVR has no voting rights in any of the development entities. The sole purpose of the development entity’s activities is to generate positive cash flow returns for the equity holders. Further, NVR does not share in any of the profit or loss generated by the project’s development. The profits and losses are passed directly to the developer’s equity holders. The deposit placed by NVR pursuant to the Lot Purchase Agreement is deemed to be a variable interest in the respective development entities. Those development entities are deemed to be VIEs. Therefore, the development entities with which NVR enters into Lot Purchase Agreements, including the joint venture limited liability corporations discussed below, are evaluated for possible consolidation by NVR. An enterprise must consolidate a VIE when that enterprise has a controlling financial interest in the VIE. An enterprise is deemed to have a controlling financial interest if it has (i) the power to direct the activities of a VIE that most significantly impact the entity’s economic performance, and (ii) the obligation to absorb losses of the VIE that could be significant to the VIE or the rights to receive benefits from the VIE that could be significant to the VIE. NVR believes the activities that most significantly impact a development entity’s economic performance are the operating activities of the entity. The development entity’s equity investors bear the full risk during the development process. Unless and until a development entity completes finished building lots through the development process, the entity does not earn any revenues. The operating development activities are managed solely by the development entity’s equity investors. The development entities with which NVR contracts to buy finished lots typically select the respective projects, obtain the necessary zoning approvals, obtain the financing required with no support or guarantees from NVR, select who will purchase the finished lots and at what price, and manage the completion of the infrastructure improvements, all for the purpose of generating a cash flow return to the development entity’s equity holders and all independent of NVR. The Company possesses no more than limited protective legal rights through the Lot Purchase Agreement in the specific finished lots that it is purchasing, and NVR possesses no participative rights in the development entities. Accordingly, NVR does not have the power to direct the activities of a developer that most significantly impact the developer’s economic performance. For this reason, NVR has concluded that it is not the primary beneficiary of the development entities with which the Company enters into Lot Purchase Agreements, and therefore, NVR does not consolidate any of these VIEs. As of September 30, 2018 , NVR controlled approximately 92,350 lots under Lot Purchase Agreements with third parties through deposits in cash and letters of credit totaling approximately $398,800 and $3,800 , respectively. As noted above, NVR’s sole legal obligation and economic loss for failure to perform under these Lot Purchase Agreements is limited to the amount of the deposit pursuant to the liquidated damage provisions contained in the Lot Purchase Agreements. In addition, NVR has certain properties under contract with land owners that are expected to yield approximately 7,800 lots, which are not included in the number of total lots controlled. Some of these properties may require rezoning or other approvals to achieve the expected yield. These properties are controlled with deposits in cash and letters of credit totaling approximately $3,500 and $100 , respectively, as of September 30, 2018 , of which approximately $1,300 is refundable if certain contractual conditions are not met. NVR generally expects to assign the raw land contracts to a land developer and simultaneously enter into a Lot Purchase Agreement with the assignee if the project is determined to be feasible. NVR’s total risk of loss related to contract land deposits as of September 30, 2018 and December 31, 2017 was as follows: September 30, 2018 December 31, 2017 Contract land deposits $ 402,318 $ 400,428 Loss reserve on contract land deposits (27,968 ) (29,999 ) Contract land deposits, net 374,350 370,429 Contingent obligations in the form of letters of credit 3,870 1,996 Specific performance obligations (1) 1,505 1,505 Total risk of loss $ 379,725 $ 373,930 (1) As of both September 30, 2018 and December 31, 2017 , the Company was committed to purchase 10 finished lots under specific performance obligations.

Joint Ventures

Joint Ventures	9 Months Ended
Joint Ventures	Sep. 30, 2018
Equity Method Investments and Joint Ventures [Abstract]
Joint Ventures	Joint Ventures On a limited basis, NVR obtains finished lots using joint venture limited liability corporations (“JVs”). The JVs are typically structured such that NVR is a non-controlling member and is at risk only for the amount the Company has invested, or has committed to invest, in addition to any deposits placed under Lot Purchase Agreements with the joint venture. NVR is not a borrower, guarantor or obligor on any debt of the JVs, as applicable. The Company enters into Lot Purchase Agreements to purchase lots from these JVs, and as a result has a variable interest in these JVs. During the third quarter of 2018, the Company recognized a $7,400 impairment charge (including approximately $760 of capitalized interest) related to one of these JVs. The charge was recorded to homebuilding "Cost of sales" on the accompanying condensed consolidated statements of income. None of the other JVs had any indicators of impairment as of September 30, 2018. At September 30, 2018 , the Company had an aggregate investment totaling approximately $31,750 in six JVs that are expected to produce approximately 6,900 finished lots, of which approximately 3,550 lots were controlled by the Company and the remaining approximately 3,350 lots were either under contract with unrelated parties or not currently under contract. In addition, NVR had additional funding commitments totaling approximately $5,000 in the aggregate to three of the JVs at September 30, 2018 . The Company has determined that it is not the primary beneficiary of five of the JVs because either NVR and the other JV partner share power or the other JV partner has the controlling financial interest. The aggregate investment in unconsolidated JVs was approximately $31,750 and $49,000 at September 30, 2018 and December 31, 2017 , respectively, and is reported in the “Other assets” line item on the accompanying condensed consolidated balance sheets. For the remaining JV, NVR has concluded that it is the primary beneficiary because the Company has the controlling financial interest in the JV. The condensed balance sheets as of September 30, 2018 and December 31, 2017 of the consolidated JV were as follows: September 30, 2018 December 31, 2017 Assets: Cash $ 335 $ 1,069 Other assets — 37 Total assets $ 335 $ 1,106 Liabilities and equity: Accrued expenses $ 290 $ 487 Equity 45 619 Total liabilities and equity $ 335 $ 1,106 The Company recognizes income from the JVs as a reduction to the lot cost of the lots purchased from the respective JVs when the homes are settled, based on the expected total profitability and the total number of lots expected to be produced by the respective JVs. With the Company's adoption of ASU 2016-15 effective January 1, 2018, the Company made the election to classify distributions received from unconsolidated JVs using the cumulative earnings approach. As a result, distributions received up to the amount of cumulative earnings recognized by the Company are reported as distributions of earnings and those in excess of that amount are reported as a distribution of capital. These distributions are classified within the accompanying condensed consolidated statements of cash flows as cash flows from operating activities and investing activities, respectively. See Note 1 for additional discussion regarding the Company's adoption of ASU 2016-15.

Land Under Development

Land Under Development	9 Months Ended
Land Under Development	Sep. 30, 2018
Real Estate [Abstract]
Land Under Development	Land Under Development On a limited basis, NVR directly acquires raw land parcels already zoned for its intended use to develop into finished lots. Land under development includes the land acquisition costs, direct improvement costs, capitalized interest where applicable, and real estate taxes. As of September 30, 2018 , NVR directly owned a total of three separate raw land parcels with a carrying value of $36,064 that are expected to produce approximately 500 finished lots. The Company also has additional funding commitments of approximately $7,900 under a joint development agreement related to one parcel, a portion of which the Company expects will be offset by development credits of approximately $4,700 . None of the raw parcels had any indicators of impairment as of September 30, 2018 .

Capitalized Interest

Capitalized Interest	9 Months Ended
Capitalized Interest	Sep. 30, 2018
Capitalized Interest Costs, Including Allowance for Funds Used During Construction [Abstract]
Capitalized Interest	Capitalized Interest The Company capitalizes interest costs to land under development during the active development of finished lots. In addition, the Company capitalizes interest costs to its joint venture investments while the investments are considered qualified assets pursuant to ASC Topic 835-20 - Interest . Capitalized interest is transferred to sold or unsold inventory as the development of finished lots is completed, then charged to cost of sales upon the Company’s settlement of homes and the respective lots. Interest incurred in excess of the interest capitalizable based on the level of qualified assets is expensed in the period incurred. The following table reflects the changes in the Company's capitalized interest during the three and nine months ended September 30, 2018 and 2017 : Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 Interest capitalized, beginning of period $ 5,388 $ 5,952 $ 5,583 $ 5,106 Interest incurred 6,517 6,615 19,737 19,754 Interest charged to interest expense (6,197 ) (6,120 ) (18,808 ) (17,870 ) Interest charged to cost of sales (1,136 ) (778 ) (1,940 ) (1,321 ) Interest capitalized, end of period $ 4,572 $ 5,669 $ 4,572 $ 5,669

Earnings per Share

Earnings per Share	9 Months Ended
Earnings per Share	Sep. 30, 2018
Earnings Per Share [Abstract]
Earnings per Share	Earnings per Share The following weighted average shares and share equivalents were used to calculate basic and diluted earnings per share for the three and nine months ended September 30, 2018 and 2017 : Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 Weighted average number of shares outstanding used to calculate basic EPS 3,612 3,747 3,640 3,733 Dilutive securities: Stock options and restricted share units 444 516 499 466 Weighted average number of shares and share equivalents outstanding used to calculate diluted EPS 4,056 4,263 4,139 4,199 The following non-qualified stock options ("Options") and restricted share units (RSUs") issued under equity incentive plans were outstanding during the three and nine months ended September 30, 2018 and 2017 , but were not included in the computation of diluted earnings per share because the effect would have been anti-dilutive. Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 Anti-dilutive securities 371 8 353 17

Equity-Based Compensation

Equity-Based Compensation	9 Months Ended
Equity-Based Compensation	Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Equity-Based Compensation	Equity-Based Compensation The Company’s shareholders approved the NVR, Inc. 2018 Equity Incentive Plan (the "2018 Plan") at the Company’s Annual Meeting of Shareholders held on May 2, 2018. The 2018 Plan authorizes the Company to issue up to an aggregate of 275 shares of the Company’s common stock in the form of Options and RSUs to key management employees, including executive officers and members of our Board of Directors ("Directors"). Of the 275 aggregate shares available to issue, all may be granted in the form of Options and up to 40 may be granted in the form of RSUs. During the second quarter of 2018, the Company issued 332 Options and 16 RSUs under the NVR, Inc. 2010 Equity Incentive Plan (the "2010 Plan"), the NVR, Inc. 2014 Equity Incentive Plan (the "2014 Plan"), and the 2018 Plan as follows: 2010 Plan 2014 Plan 2018 Plan Options Granted Options - service-only (1) 4 90 72 Options - performance-based (2) — 94 72 Total Options Granted 4 184 144 RSUs Granted RSUs - service-only (3) 8 — — RSUs - performance-based (4) 8 — — Total RSUs Granted 16 — — (1) Of the 166 service-only Options granted, 34 will vest over two years in 50% increments on December 31, 2020 and 2021; the remaining 132 Options will vest over four years in 25% increments on December 31, 2020, 2021, 2022, and 2023. Vesting for the Options is contingent solely upon continued employment or continued service as a Director. (2) Of the 166 performance-based Options granted, 34 will vest over two years in 50% increments on December 31, 2020 and 2021; the remaining 132 performance-based Options will vest over four years in 25% increments on December 31, 2020, 2021, 2022, and 2023. Vesting for the performance-based Options is contingent upon both continued employment or continued service as a Director and the Company's return on capital performance during 2018 through 2020. (3) The service-only RSUs granted will vest over two years in 50% increments on December 31, 2022 and 2023. Vesting for the RSUs is contingent solely upon continued employment. (4) The performance-based RSUs granted will vest over two years in 50% increments on December 31, 2022 and 2023. Vesting for the performance-based RSUs is contingent upon both continued employment and the Company's return on capital performance during 2018 through 2020. In addition to the above equity grant, the Company also issued a total of 9 Options under the 2010 Plan and 2014 Plan during the nine months ended September 30, 2018. The Options granted will predominantly vest annually over four years in 25% increments beginning on December 31, 2020. Vesting for 50% of the Options granted is contingent upon both continued employment and the Company's return on capital performance during 2018 through 2020, while vesting for the other 50% of the Options granted is contingent solely upon continued employment. All Options were granted at an exercise price equal to the closing price of the Company’s common stock on the day prior to the date of grant, and expire ten years from the date of grant. The following table provides additional information relative to NVR's equity-based compensation plans for the nine months ended September 30, 2018: Options Shares Weighted Average Per Share Exercise Price Outstanding at December 31, 2017 916 $ 1,119.92 Granted 341 3,022.95 Exercised (121 ) 952.18 Forfeited (30 ) 1,283.48 Outstanding at September 30, 2018 1,106 $ 1,719.97 Exercisable at September 30, 2018 341 $ 959.64 RSUs Outstanding at December 31, 2017 10 Granted 16 Vested (5 ) Forfeited — Outstanding at September 30, 2018 21 Vested, but not issued at September 30, 2018 — To estimate the grant date fair value of its Options, the Company uses the Black-Scholes option-pricing model (the “Pricing Model”). The Pricing Model estimates the per share fair value of an option on its date of grant based on the following factors: the option’s exercise price, the price of the underlying stock on the date of grant, the estimated dividend yield, a risk-free interest rate, the estimated option term, and the expected volatility. For the risk-free interest rate, the Company uses U.S. Treasury STRIPS which mature at approximately the same time as the option’s expected holding term. For expected volatility, NVR has concluded that its historical volatility over the option’s expected holding term provides the most reasonable basis for this estimate. The fair value of the Options granted during 2018 was estimated on the grant date using the Pricing Model, based on the following assumptions: 2018 Estimated option life (years) 5.06 Risk-free interest rate (range) 2.19% - 2.99% Expected volatility (range) 16.57% - 20.00% Expected dividend rate —% Weighted average grant date fair value per share of Options granted $689.09 The weighted-average grant date fair value per share of $3,019.04 for the RSUs granted during 2018 was the closing price of the Company's common stock on the day immediately preceding the grant date. Compensation cost for Options and RSUs is recognized on a straight-line basis over the requisite service period for the entire award (from the date of grant through the period of the last separately vesting portion of the grant). For the recognition of equity-based compensation, the Options and RSUs that are subject to a performance condition are treated as a separate award from the “service-only” Options and RSUs, and compensation expense for Options and RSUs subject to a performance condition is recognized when it becomes probable that the stated performance target will be achieved. The Company currently believes that it is probable that the performance condition will be satisfied at the target level and is recognizing compensation expense related to such Options and RSUs accordingly. Compensation cost is recognized within the income statement in the same expense line as the cash compensation paid to the respective employees. The Company recognizes forfeitures of equity-based awards as a reduction to compensation costs in the period in which they occur. Total equity-based compensation expense recognized during the three and nine months ended September 30, 2018 was $23,586 and $51,690 , respectively. During the three and nine months ended September 30, 2017, total equity-based compensation expense recognized was $11,211 and $32,678 , respectively. As of September 30, 2018, the total unrecognized compensation cost for all outstanding Options and RSUs was approximately $322,900 . The unrecognized compensation cost will be recognized over each grant’s applicable vesting period, with the latest vesting date being December 31, 2023. Unrecognized compensation costs may change depending on the satisfaction of the performance-based metric, discussed above. The weighted-average period over which the unrecognized compensation will be recorded is equal to approximately 2.7 years.

Shareholders' Equity

Shareholders' Equity	9 Months Ended
Shareholders' Equity	Sep. 30, 2018
Equity [Abstract]
Shareholders' Equity	Shareholders’ Equity A summary of changes in shareholders’ equity is presented below: Common Stock Additional Paid-In Capital Retained Earnings Treasury Stock Deferred Compensation Trust Deferred Compensation Liability Total Balance, December 31, 2017 $ 206 $ 1,644,197 $ 6,231,940 $ (6,270,851 ) $ (17,383 ) $ 17,383 $ 1,605,492 Cumulative-effect adjustment from adoption of ASU 2014-09, net of tax — — 2,196 — — — 2,196 Net income — — 565,039 — — — 565,039 Deferred compensation activity, net — — — — 455 (455 ) — Purchase of common stock for treasury — — — (657,369 ) — — (657,369 ) Equity-based compensation — 51,690 — — — — 51,690 Proceeds from Options exercised — 115,268 — — — — 115,268 Treasury stock issued upon option exercise and restricted share vesting — (48,832 ) — 48,832 — — — Balance, September 30, 2018 $ 206 $ 1,762,323 $ 6,799,175 $ (6,879,388 ) $ (16,928 ) $ 16,928 $ 1,682,316 The Company repurchased approximately 222 shares of its common stock during the nine months ended September 30, 2018 . The Company settles Option exercises and vesting of RSUs by issuing shares of treasury stock. Approximately 126 shares were issued from the treasury account during the nine months ended September 30, 2018 in settlement of Option exercises and vesting of RSUs. Shares are relieved from the treasury account based on the weighted average cost basis of treasury shares acquired.

Product Warranties

Product Warranties	9 Months Ended
Product Warranties	Sep. 30, 2018
Product Warranties Disclosures [Abstract]
Product Warranties	Product Warranties The Company establishes warranty and product liability reserves (“Warranty Reserve”) to provide for estimated future expenses as a result of construction and product defects, product recalls and litigation incidental to NVR’s homebuilding business. Liability estimates are determined based on management’s judgment, considering such factors as historical experience, the estimated current cost of corrective action, manufacturers’ and subcontractors’ participation in sharing the cost of corrective action, consultations with third party experts such as engineers, and discussions with the Company’s general counsel and outside counsel retained to handle specific product liability cases. The following table reflects the changes in the Company’s Warranty Reserve during the three and nine months ended September 30, 2018 and 2017 : Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 Warranty reserve, beginning of period $ 99,702 $ 95,394 $ 94,513 $ 93,895 Provision 15,900 12,940 43,644 35,107 Payments (15,771 ) (11,677 ) (38,326 ) (32,345 ) Warranty reserve, end of period $ 99,831 $ 96,657 $ 99,831 $ 96,657

Segment Disclosures

Segment Disclosures	9 Months Ended
Segment Disclosures	Sep. 30, 2018
Segment Reporting [Abstract]
Segment Disclosures	Segment Disclosures The following disclosure includes four homebuilding reportable segments that aggregate geographically the Company’s homebuilding operating segments, and the mortgage banking operations presented as one reportable segment. The homebuilding reportable segments are comprised of operating divisions in the following geographic areas: Mid Atlantic: Maryland, Virginia, West Virginia, Delaware and Washington, D.C. North East: New Jersey and Eastern Pennsylvania Mid East: New York, Ohio, Western Pennsylvania, Indiana and Illinois South East: North Carolina, South Carolina, Florida and Tennessee Homebuilding profit before tax includes all revenues and income generated from the sale of homes, less the cost of homes sold, selling, general and administrative expenses and a corporate capital allocation charge. The corporate capital allocation charge is eliminated in consolidation and is based on the segment’s average net assets employed. The corporate capital allocation charged to the operating segment allows the Chief Operating Decision Maker (“CODM”) to determine whether the operating segment’s results are providing the desired rate of return after covering the Company’s cost of capital. Certain assets are not allocated to the operating segments as those assets are neither included in the operating segment’s corporate capital allocation charge, nor in the CODM’s evaluation of the operating segment’s performance. The Company records charges on contract land deposits when it is determined that it is probable that recovery of the deposit is impaired. For segment reporting purposes, impairments on contract land deposits are generally charged to the operating segment upon the termination of a Lot Purchase Agreement with the developer, or the restructuring of a Lot Purchase Agreement resulting in the forfeiture of the deposit. Mortgage banking profit before tax consists of revenues generated from mortgage financing, title insurance and closing services, less the costs of such services and general and administrative costs. Mortgage banking operations are not charged a corporate capital allocation charge. In addition to the corporate capital allocation and contract land deposit impairments discussed above, the other reconciling items between segment profit and consolidated profit before tax include unallocated corporate overhead (including all management incentive compensation), equity-based compensation expense, consolidation adjustments and external corporate interest expense. NVR’s overhead functions, such as accounting, treasury and human resources, are centrally performed and the costs are not allocated to the Company’s operating segments. Consolidation adjustments consist of such items necessary to convert the reportable segments’ results, which are predominantly maintained on a cash basis, to a full accrual basis for external financial statement presentation purposes, and are not allocated to the Company’s operating segments. External corporate interest expense primarily consists of interest charges on the Company’s 3.95% Senior Notes due 2022 (the “Senior Notes”) and is not charged to the operating segments because the charges are included in the corporate capital allocation discussed above. The f ollowing tables present segment revenues, profit and assets with reconciliations to the amounts reported for the consolidated enterprise, where applicable: Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 Revenues: Homebuilding Mid Atlantic $ 991,077 $ 927,551 $ 2,807,251 $ 2,521,967 Homebuilding North East 152,858 141,033 423,190 374,804 Homebuilding Mid East 391,933 338,900 1,045,458 895,168 Homebuilding South East 273,477 226,242 774,002 602,088 Mortgage Banking 43,062 34,194 119,225 95,477 Total consolidated revenues $ 1,852,407 $ 1,667,920 $ 5,169,126 $ 4,489,504 Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 Income before taxes: Homebuilding Mid Atlantic $ 115,180 $ 109,417 $ 318,447 $ 274,527 Homebuilding North East 18,560 18,762 51,041 41,980 Homebuilding Mid East 51,744 44,990 121,129 103,135 Homebuilding South East 31,426 26,849 83,867 64,330 Mortgage Banking 27,183 19,336 69,418 53,293 Total segment profit before taxes 244,093 219,354 643,902 537,265 Reconciling items: Contract land deposit reserve adjustment (1) (689 ) 1,910 2,031 (882 ) Equity-based compensation expense (2) (23,586 ) (11,211 ) (51,690 ) (32,678 ) Corporate capital allocation (3) 55,438 51,904 160,091 147,737 Unallocated corporate overhead (20,424 ) (18,768 ) (74,211 ) (69,362 ) Consolidation adjustments and other 831 7,087 20,142 20,513 Corporate interest expense (5,953 ) (5,812 ) (17,971 ) (17,000 ) Reconciling items sub-total 5,617 25,110 38,392 48,328 Consolidated income before taxes $ 249,710 $ 244,464 $ 682,294 $ 585,593 (1) This item represents changes to the contract land deposit impairment reserve, which are not allocated to the reportable segments. (2) The increase in equity-based compensation expense in the three and nine month periods ended September 30, 2018 was primarily attributable to the issuance of Options and RSUs in the second quarter of 2018. See Note 7 for additional discussion of equity-based compensation. (3) This item represents the elimination of the corporate capital allocation charge included in the respective homebuilding reportable segments. The corporate capital allocation charge is based on the segment’s monthly average asset balance, and was as follows for the periods presented: Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 Corporate capital allocation charge: Homebuilding Mid Atlantic $ 31,733 $ 32,025 $ 93,682 $ 92,154 Homebuilding North East 4,565 4,244 13,325 12,191 Homebuilding Mid East 9,541 7,747 26,571 22,024 Homebuilding South East 9,599 7,888 26,513 21,368 Total $ 55,438 $ 51,904 $ 160,091 $ 147,737 September 30, 2018 December 31, 2017 Assets: Homebuilding Mid Atlantic $ 1,098,095 $ 1,079,225 Homebuilding North East 160,541 143,008 Homebuilding Mid East 324,253 263,019 Homebuilding South East 340,686 277,705 Mortgage Banking 365,862 397,052 Total segment assets 2,289,437 2,160,009 Reconciling items: Cash and cash equivalents 598,789 645,087 Deferred taxes 115,824 111,953 Intangible assets and goodwill 50,028 50,144 Contract land deposit reserve (27,968 ) (29,999 ) Consolidation adjustments and other 63,713 52,085 Reconciling items sub-total 800,386 829,270 Consolidated assets $ 3,089,823 $ 2,989,279

Fair Value

Fair Value	9 Months Ended
Fair Value	Sep. 30, 2018
Fair Value Disclosures [Abstract]
Fair Value	Fair Value GAAP assigns a fair value hierarchy to the inputs used to measure fair value. Level 1 inputs are quoted prices in active markets for identical assets and liabilities. Level 2 inputs are inputs other than quoted market prices that are observable for the asset or liability, either directly or indirectly. Level 3 inputs are unobservable inputs. Financial Instruments The estimated fair values of NVR’s Senior Notes as of September 30, 2018 and December 31, 2017 were $624,000 and $630,000 , respectively. The estimated fair value is based on recent market prices of similar transactions, which is classified as Level 2 within the fair value hierarchy. The carrying values at September 30, 2018 and December 31, 2017 were $597,527 and $597,066 , respectively. Except as otherwise noted below, NVR believes that insignificant differences exist between the carrying value and the fair value of its financial instruments, which consist primarily of cash equivalents, due to their short term nature. Derivative Instruments and Mortgage Loans Held for Sale In the normal course of business, NVR’s wholly-owned mortgage subsidiary, NVR Mortgage Finance, Inc. (“NVRM”), enters into contractual commitments to extend credit to NVR’s homebuyers with fixed expiration dates. The commitments become effective when the borrowers "lock-in" a specified interest rate within time frames established by NVRM. All mortgagors are evaluated for credit worthiness prior to the extension of the commitment. Market risk arises if interest rates move adversely between the time of the "lock-in" of rates by the borrower and the sale date of the loan to a broker/dealer. To mitigate the effect of the interest rate risk inherent in providing rate lock commitments to borrowers, NVRM enters into optional or mandatory delivery forward sale contracts to sell whole loans and mortgage-backed securities to broker/dealers. The forward sales contracts lock in an interest rate and price for the sale of loans similar to the specific rate lock commitments. NVRM does not engage in speculative or trading derivative activities. Both the rate lock commitments to borrowers and the forward sale contracts to broker/dealers are undesignated derivatives and, accordingly, are marked to fair value through earnings. At September 30, 2018 , there were contractual commitments to extend credit to borrowers aggregating $864,355 and open forward delivery contracts aggregating $1,120,810 , which hedge both the rate lock loan commitments and closed loans held for sale. The fair value of NVRM’s rate lock commitments to borrowers and the related input levels include, as applicable: i) the assumed gain/loss of the expected resultant loan sale (Level 2); ii) the effects of interest rate movements between the date of the rate lock and the balance sheet date (Level 2); and iii) the value of the servicing rights associated with the loan (Level 2). The assumed gain/loss considers the excess servicing to be received or buydown fees to be paid upon securitization of the loan. The excess servicing and buydown fees are calculated pursuant to contractual terms with investors. To calculate the effects of interest rate movements, NVRM utilizes applicable published mortgage-backed security prices, and multiplies the price movement between the rate lock date and the balance sheet date by the notional loan commitment amount. NVRM sells all of its loans on a servicing released basis, and receives a servicing released premium upon sale. Thus, the value of the servicing rights is included in the fair value measurement and is based upon contractual terms with investors and varies depending on the loan type. NVRM assumes a fallout rate when measuring the fair value of rate lock commitments. Fallout is defined as locked loan commitments for which NVRM does not close a mortgage loan and is based on historical experience. The fair value of NVRM’s forward sales contracts to broker/dealers solely considers the market price movement of the same type of security between the trade date and the balance sheet date (Level 2). The market price changes are multiplied by the notional amount of the forward sales contracts to measure the fair value. Mortgage loans held for sale are recorded at fair value when closed, and thereafter are carried at the lower of cost or fair value, net of deferred origination costs, until sold. Fair value is measured using Level 2 inputs. The fair value of loans held for sale of $322,944 included on the accompanying condensed consolidated balance sheet has been increased by $3,127 from the aggregate principal balance of $319,817 . As of December 31, 2017 , the fair value of loans held for sale of $352,489 were increased by $1,931 from the aggregate principal balance of $350,558 . The fair value measurement of NVRM's undesignated derivative instruments was as follows: September 30, 2018 December 31, 2017 Rate lock commitments: Gross assets $ 12,195 $ 5,400 Gross liabilities 3,165 1,832 Net rate lock commitments $ 9,030 $ 3,568 Forward sales contracts: Gross assets $ 1,949 $ 992 Gross liabilities 669 667 Net forward sales contracts $ 1,280 $ 325 As of both September 30, 2018 and December 31, 2017 , the net rate lock commitments and the net forward sales contracts are reported in mortgage banking "Other assets" on the accompanying condensed consolidated balance sheets. The fair value measurement adjustment as of September 30, 2018 was as follows: Notional or Principal Amount Assumed Gain/(Loss) From Loan Sale Interest Rate Movement Effect Servicing Rights Value Security Price Change Total Fair Value Measurement Gain/(Loss) Rate lock commitments $ 864,355 $ 1,486 $ (2,376 ) $ 9,920 $ — $ 9,030 Forward sales contracts $ 1,120,810 — — — 1,280 1,280 Mortgages held for sale $ 319,817 667 (1,934 ) 4,394 — 3,127 Total fair value measurement $ 2,153 $ (4,310 ) $ 14,314 $ 1,280 $ 13,437 The total fair value measurement adjustment as of December 31, 2017 was $5,824 . For the three months ended September 30, 2018 , NVRM recorded a fair value adjustment to expense of $1,986 . For the nine months ended September 30, 2018 , NVRM recorded a fair value adjustment to income of $7,613 . For the three and nine months ended September 30, 2017 , NVRM recorded a fair value adjustment to income of $1,572 and $2,931 , respectively. Unrealized gains/losses from the change in the fair value measurements are included in earnings as a component of mortgage banking fees in the accompanying condensed consolidated statements of income. The fair value measurement will be impacted in the future by the change in the value of the servicing rights, interest rate movements, security price fluctuations, and the volume and product mix of NVRM’s closed loans and locked loan commitments.

Debt

Debt	9 Months Ended
Debt	Sep. 30, 2018
Debt Disclosure [Abstract]
Debt	Debt Senior Notes As of September 30, 2018 , the Company had Senior Notes outstanding with a principal balance of $600,000 . The Senior Notes mature on September 15, 2022 and bear interest at 3.95% , payable semi-annually in arrears on March 15 and September 15 . The Senior Notes were issued at a discount to yield 3.97% and have been reflected net of the unamortized discount and unamortized debt issuance costs in the accompanying condensed consolidated balance sheet. Credit Agreement NVR has an unsecured Credit Agreement (the “Credit Agreement”), which provides for aggregate revolving loan commitments of $200,000 (the “Facility”). Under the Credit Agreement, the Company may request increases of up to $300,000 to the Facility in the form of revolving loan commitments or term loans to the extent that new or existing lenders agree to provide additional revolving loan or term loan commitments. The Credit Agreement provides for a $100,000 sublimit for the issuance of letters of credit, of which approximately $9,600 was outstanding at September 30, 2018 , and a $25,000 sublimit for a swing line commitment. The Credit Agreement termination date is July 15, 2021 . There was no debt outstanding under the Facility at September 30, 2018 . Repurchase Agreement NVRM provides for its mortgage origination and other operating activities using cash generated from its operations, borrowings from its parent company, NVR, as well as a revolving mortgage repurchase agreement (the “Repurchase Agreement”), which is non-recourse to NVR. The Repurchase Agreement provides for loan purchases up to $150,000 , subject to certain sub-limits. Amounts outstanding under the Repurchase Agreement are collateralized by the Company’s mortgage loans held for sale. On July 25, 2018, NVRM entered into the Tenth Amendment (the "Amendment") to its Repurchase Agreement. The Amendment removed the $50,000 incremental commitment that was available under the prior Repurchase Agreement. All other terms and conditions under the Repurchase Agreement remained materially consistent. The Repurchase Agreement expires on July 24, 2019 . At September 30, 2018 , there were no borrowing base limitations reducing the amount available under the Repurchase Agreement. There was no debt outstanding under the Repurchase Agreement at September 30, 2018 .

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
Commitments and Contingencies	Sep. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies The Company and its subsidiaries are involved in various litigation arising in the ordinary course of business. In the opinion of management, and based on advice of legal counsel, this litigation is not expected to have a material adverse effect on the financial position, results of operations or cash flows of the Company. Legal costs incurred in connection with outstanding litigation are expensed as incurred.

Income Taxes

Income Taxes	9 Months Ended
Income Taxes	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company’s effective tax rate for the three and nine months ended September 30, 2018 was 21.6% and 17.2% , respectively. For the three and nine months ended September 30, 2017 , the Company's effective tax rate was 33.7% and 29.5% , respectively. The reduction in the effective tax rate was primarily due to the following items: • The enactment of the Tax Cuts and Jobs Act in December 2017, which lowered the Company's federal statutory tax rate from 35% to 21%, and • The retroactive reinstatement of certain expired energy tax credits under the Bipartisan Budget Act of 2018, which resulted in the Company recognizing a tax benefit of approximately $6,200 in the first quarter of 2018 related to homes settled in 2017. Additionally, the effective tax rate for the three and nine months ended September 30, 2018 and 2017 was favorably impacted by the recognition of an income tax benefit related to excess tax benefits from stock option exercises. This income tax benefit was $12,585 and $58,607 for the three and nine months ended September 30, 2018 , respectively, and was $8,357 and $44,720 for the three and nine months ended September 30, 2017 , respectively.

Recent Accounting Pronouncement

Recent Accounting Pronouncements	9 Months Ended
Recent Accounting Pronouncements	Sep. 30, 2018
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Recent Accounting Pronouncements	Recent Accounting Pronouncements In February 2016, the Financial Accounting Standards Board (the "FASB") issued ASU 2016-02, Leases (Topic 842) , which requires lessees to recognize most leases on-balance sheet with a liability equal to the present value of lease payments over the lease term and a right-of-use asset for the right to use the underlying asset over the lease term. Lessees will recognize expenses on their income statements in a manner similar to current GAAP. The standard also requires additional disclosures of key information about leasing arrangements. The standard is effective for the Company as of January 1, 2019. Based on its current portfolio of leases, the Company believes that adoption of this standard will result in the recognition of less than $100,000 of right-of-use assets and corresponding liabilities on its balance sheet, predominately related to real estate leases. Additionally, in July 2018 the FASB issued ASU 2018-11, Leases (Topic 842): Targeted Improvements , which provides companies with relief from the costs of implementing certain aspects of the new lease standard. The ASU amends Topic 842 so that entities may elect not to restate their comparative periods during transition. Previously, the new lease standard required that an entity apply the new rules beginning with the earliest comparative period of financial statements presented (the "modified retrospective" approach). The Company will elect to use the transition relief provided under Topic 842 when the standard becomes effective for the Company on January 1, 2019. In June 2016, the FASB issued ASU 2016-13, Financial Instruments – Credit Losses (Topic 326) , which significantly changes the way impairment of financial assets is recognized. The standard will require immediate recognition of estimated credit losses expected to occur over the remaining life of many financial assets, which will generally result in earlier recognition of allowances for credit losses on loans and other financial instruments. The standard’s provisions will be applied as a cumulative-effect adjustment to beginning retained earnings as of the effective date. The standard is effective for the Company as of January 1, 2020. Early adoption is permitted for annual and interim periods beginning January 1, 2019. The Company does not believe that the adoption of this standard will have a material effect on its consolidated financial statements and related disclosures. In January 2017, the FASB issued ASU 2017-04, Intangibles – Goodwill and Other (Topic 350), Simplifying the Test for Goodwill Impairment . The standard’s objective is to simplify the subsequent measurement of goodwill by eliminating the second step from the goodwill impairment test. Under the amendments in the standard, an entity would perform its annual, or interim, goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. If the carrying amount of a reporting unit exceeds its fair value, an impairment charge would then be recognized, not to exceed the amount of goodwill allocated to that reporting unit. The standard is effective for the Company on January 1, 2020, and early adoption is permitted. The Company does not believe that the adoption of this standard will have a material effect on its consolidated financial statements and related disclosures.

Basis of Presentation (Policies

Basis of Presentation (Policies)	9 Months Ended
Basis of Presentation (Policies)	Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
New Accounting Pronouncements	Recently Adopted Accounting Pronouncements Revenue from Contracts with Customers On January 1, 2018, the Company adopted Accounting Standards Update 2014-09, Revenue from Contracts with Customers (Topic 606) , using the modified retrospective method applied to those contracts which were not completed as of January 1, 2018. Revenue Recognition Consistent with the Company’s previous revenue recognition practice, homebuilding revenue is recognized on the settlement date at the contract sales price, when control is transferred to our customers. Mortgage banking revenue recognition will continue to be governed by Accounting Standards Codification ("ASC") Topic 815 - Derivatives and Hedging and ASC Topic 825 - Financial Instruments, and is not subject to Topic 606. See Note 10 for disclosure of revenue by reporting segment. The Company’s contract liabilities, consisting of deposits received from customers (“Handmoney”) on homes not settled, were $167,676 and $172,033 as of September 30, 2018 and June 30, 2018, respectively. During the third quarter of 2018, the Company recognized in revenue approximately $91,000 of the Handmoney held as of June 30, 2018. For the nine month period ended September 30, 2018, the Company recognized substantially all of the $150,033 in Handmoney held as of December 31, 2017. The Company’s prepaid sales compensation totaled approximately $21,500 and $19,500 , as of September 30, 2018 and December 31, 2017 , respectively. These amounts are included in homebuilding “Other assets” on the accompanying condensed consolidated balance sheets. Deferred Revenue Topic 606 no longer requires sellers of real estate to consider the initial and continuing involvement criteria in ASC 360-20, but instead only conclude on the collectibility of the transaction price. On January 1, 2018, the Company recorded a cumulative-effect adjustment, net of tax, of $2,196 to recognize deferred profit on home settlements for which the Company had previously determined that there was significant continuing involvement and believed to be fully collectible. Practical Expedients and Exemption At contract inception, the performance obligation to complete and settle the home with a customer has an expected duration of less than one year. As a result, the Company does not disclose the value of unsatisfied performance obligations for contracts. No other adjustments were made as a result of the adoption of Topic 606. Other recently adopted accounting pronouncements The Company adopted ASU 2016-15, Classification of Certain Cash Receipts and Cash Payments, effective January 1, 2018. In connection with the adoption of ASU 2016-15, the Company made the election to classify distributions received from unconsolidated joint ventures using the cumulative earnings approach. This election was applied retrospectively, which reclassified a portion of distributions received from the Company's unconsolidated joint ventures between operating and investing activities on the prior year condensed consolidated statement of cash flows. The adoption of this standard did not have a material effect on the Company's condensed consolidated statements of cash flows and related disclosures. The Company adopted ASU 2016-18, Statement of Cash Flows (Topic 230), Restricted Cash, effective January 1, 2018. The amendments in the standard require that the statement of cash flows explain the change during the period in the total of cash, cash equivalents and restricted cash or restricted cash equivalents. As a result, the Company's beginning-of-period and end-of-period cash balances presented in the condensed consolidated statements of cash flows were retrospectively adjusted to include restricted cash with cash and cash equivalents. The Company's cash and cash equivalents include short-term investments with original maturities of three months or less. Homebuilding restricted cash was attributable to customer deposits for certain home sales. Mortgage banking restricted cash included amounts collected from customers for loans in process and closed mortgage loans held for sale. The beginning-of-period and end-of-period cash, restricted cash, and cash equivalent balances presented on the accompanying condensed consolidated statements of cash flows include cash related to a consolidated joint venture, which is included in homebuilding "Other assets" on the Company's condensed consolidated balance sheets. The cash related to this consolidated joint venture as of September 30, 2018 and December 31, 2017 was $335 and $1,069 , respectively, and as of September 30, 2017 and December 31, 2016 was $1,177 and $1,214 , respectively. The adoption of this standard did not have a material effect on the Company's condensed consolidated statements of cash flows and related disclosures. The Company also adopted ASU 2017-09, Compensation – Stock Compensation (Topic 718), Scope of Modification Accounting, effective January 1, 2018. The amendments in the standard clarify when changes in a share-based payment award must be accounted for as a modification, and will allow entities to make certain changes to share-based payment awards without accounting for them as modifications. Under the new guidance, entities will only apply modification accounting if there are substantive changes made to share-based payment awards. If a change made to a share-based payment award does not affect the fair value, vesting conditions and classification as either an equity or liability instrument, modification accounting will not need to be applied. The adoption of this standard did not have any effect on the Company's condensed consolidated financial statements and related disclosures. Recent Accounting Pronouncements In February 2016, the Financial Accounting Standards Board (the "FASB") issued ASU 2016-02, Leases (Topic 842) , which requires lessees to recognize most leases on-balance sheet with a liability equal to the present value of lease payments over the lease term and a right-of-use asset for the right to use the underlying asset over the lease term. Lessees will recognize expenses on their income statements in a manner similar to current GAAP. The standard also requires additional disclosures of key information about leasing arrangements. The standard is effective for the Company as of January 1, 2019. Based on its current portfolio of leases, the Company believes that adoption of this standard will result in the recognition of less than $100,000 of right-of-use assets and corresponding liabilities on its balance sheet, predominately related to real estate leases. Additionally, in July 2018 the FASB issued ASU 2018-11, Leases (Topic 842): Targeted Improvements , which provides companies with relief from the costs of implementing certain aspects of the new lease standard. The ASU amends Topic 842 so that entities may elect not to restate their comparative periods during transition. Previously, the new lease standard required that an entity apply the new rules beginning with the earliest comparative period of financial statements presented (the "modified retrospective" approach). The Company will elect to use the transition relief provided under Topic 842 when the standard becomes effective for the Company on January 1, 2019. In June 2016, the FASB issued ASU 2016-13, Financial Instruments – Credit Losses (Topic 326) , which significantly changes the way impairment of financial assets is recognized. The standard will require immediate recognition of estimated credit losses expected to occur over the remaining life of many financial assets, which will generally result in earlier recognition of allowances for credit losses on loans and other financial instruments. The standard’s provisions will be applied as a cumulative-effect adjustment to beginning retained earnings as of the effective date. The standard is effective for the Company as of January 1, 2020. Early adoption is permitted for annual and interim periods beginning January 1, 2019. The Company does not believe that the adoption of this standard will have a material effect on its consolidated financial statements and related disclosures. In January 2017, the FASB issued ASU 2017-04, Intangibles – Goodwill and Other (Topic 350), Simplifying the Test for Goodwill Impairment . The standard’s objective is to simplify the subsequent measurement of goodwill by eliminating the second step from the goodwill impairment test. Under the amendments in the standard, an entity would perform its annual, or interim, goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. If the carrying amount of a reporting unit exceeds its fair value, an impairment charge would then be recognized, not to exceed the amount of goodwill allocated to that reporting unit. The standard is effective for the Company on January 1, 2020, and early adoption is permitted. The Company does not believe that the adoption of this standard will have a material effect on its consolidated financial statements and related disclosures.

Variable Interest Entities ("_2

Variable Interest Entities ("VIEs") (Tables)	9 Months Ended
Variable Interest Entities ("VIEs") (Tables)	Sep. 30, 2018
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure [Abstract]
Total Risk of Loss Related to Contract Land Deposits	NVR’s total risk of loss related to contract land deposits as of September 30, 2018 and December 31, 2017 was as follows: September 30, 2018 December 31, 2017 Contract land deposits $ 402,318 $ 400,428 Loss reserve on contract land deposits (27,968 ) (29,999 ) Contract land deposits, net 374,350 370,429 Contingent obligations in the form of letters of credit 3,870 1,996 Specific performance obligations (1) 1,505 1,505 Total risk of loss $ 379,725 $ 373,930 (1) As of both September 30, 2018 and December 31, 2017 , the Company was committed to purchase 10 finished lots under specific performance obligations.

Joint Ventures (Tables)

Joint Ventures (Tables)	9 Months Ended
Joint Ventures (Tables)	Sep. 30, 2018
Consolidated Joint Venture [Member]
Schedule of Equity Method Investments [Line Items]
Condensed Balance Sheets	The condensed balance sheets as of September 30, 2018 and December 31, 2017 of the consolidated JV were as follows: September 30, 2018 December 31, 2017 Assets: Cash $ 335 $ 1,069 Other assets — 37 Total assets $ 335 $ 1,106 Liabilities and equity: Accrued expenses $ 290 $ 487 Equity 45 619 Total liabilities and equity $ 335 $ 1,106

Capitalized Interest (Tables)

Capitalized Interest (Tables)	9 Months Ended
Capitalized Interest (Tables)	Sep. 30, 2018
Capitalized Interest Costs, Including Allowance for Funds Used During Construction [Abstract]
Summary of Interest Costs Incurred, Capitalized, Expensed and Charged to Cost of Sales	The following table reflects the changes in the Company's capitalized interest during the three and nine months ended September 30, 2018 and 2017 : Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 Interest capitalized, beginning of period $ 5,388 $ 5,952 $ 5,583 $ 5,106 Interest incurred 6,517 6,615 19,737 19,754 Interest charged to interest expense (6,197 ) (6,120 ) (18,808 ) (17,870 ) Interest charged to cost of sales (1,136 ) (778 ) (1,940 ) (1,321 ) Interest capitalized, end of period $ 4,572 $ 5,669 $ 4,572 $ 5,669

Earnings per Share (Tables)

Earnings per Share (Tables)	9 Months Ended
Earnings per Share (Tables)	Sep. 30, 2018
Earnings Per Share [Abstract]
Weighted Average Shares and Share Equivalents Used to Calculate Basic and Diluted Earnings Per Share	The following weighted average shares and share equivalents were used to calculate basic and diluted earnings per share for the three and nine months ended September 30, 2018 and 2017 : Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 Weighted average number of shares outstanding used to calculate basic EPS 3,612 3,747 3,640 3,733 Dilutive securities: Stock options and restricted share units 444 516 499 466 Weighted average number of shares and share equivalents outstanding used to calculate diluted EPS 4,056 4,263 4,139 4,199
Summary of Antidilutive Securities Excluded from Computation of Earnings Per Share	The following non-qualified stock options ("Options") and restricted share units (RSUs") issued under equity incentive plans were outstanding during the three and nine months ended September 30, 2018 and 2017 , but were not included in the computation of diluted earnings per share because the effect would have been anti-dilutive. Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 Anti-dilutive securities 371 8 353 17

Equity-Based Compensation (Tabl

Equity-Based Compensation (Tables)	9 Months Ended
Equity-Based Compensation (Tables)	Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Summary of Equity-Based Compensation Plans with Grants Outstanding	During the second quarter of 2018, the Company issued 332 Options and 16 RSUs under the NVR, Inc. 2010 Equity Incentive Plan (the "2010 Plan"), the NVR, Inc. 2014 Equity Incentive Plan (the "2014 Plan"), and the 2018 Plan as follows: 2010 Plan 2014 Plan 2018 Plan Options Granted Options - service-only (1) 4 90 72 Options - performance-based (2) — 94 72 Total Options Granted 4 184 144 RSUs Granted RSUs - service-only (3) 8 — — RSUs - performance-based (4) 8 — — Total RSUs Granted 16 — — (1) Of the 166 service-only Options granted, 34 will vest over two years in 50% increments on December 31, 2020 and 2021; the remaining 132 Options will vest over four years in 25% increments on December 31, 2020, 2021, 2022, and 2023. Vesting for the Options is contingent solely upon continued employment or continued service as a Director. (2) Of the 166 performance-based Options granted, 34 will vest over two years in 50% increments on December 31, 2020 and 2021; the remaining 132 performance-based Options will vest over four years in 25% increments on December 31, 2020, 2021, 2022, and 2023. Vesting for the performance-based Options is contingent upon both continued employment or continued service as a Director and the Company's return on capital performance during 2018 through 2020. (3) The service-only RSUs granted will vest over two years in 50% increments on December 31, 2022 and 2023. Vesting for the RSUs is contingent solely upon continued employment. (4) The performance-based RSUs granted will vest over two years in 50% increments on December 31, 2022 and 2023. Vesting for the performance-based RSUs is contingent upon both continued employment and the Company's return on capital performance during 2018 through 2020.
Equity-Based Compensations Plans	The following table provides additional information relative to NVR's equity-based compensation plans for the nine months ended September 30, 2018: Options Shares Weighted Average Per Share Exercise Price Outstanding at December 31, 2017 916 $ 1,119.92 Granted 341 3,022.95 Exercised (121 ) 952.18 Forfeited (30 ) 1,283.48 Outstanding at September 30, 2018 1,106 $ 1,719.97 Exercisable at September 30, 2018 341 $ 959.64 RSUs Outstanding at December 31, 2017 10 Granted 16 Vested (5 ) Forfeited — Outstanding at September 30, 2018 21 Vested, but not issued at September 30, 2018 —
Black-Scholes Option-Pricing Model Assumptions	The fair value of the Options granted during 2018 was estimated on the grant date using the Pricing Model, based on the following assumptions: 2018 Estimated option life (years) 5.06 Risk-free interest rate (range) 2.19% - 2.99% Expected volatility (range) 16.57% - 20.00% Expected dividend rate —% Weighted average grant date fair value per share of Options granted $689.09

Shareholders' Equity (Tables)

Shareholders' Equity (Tables)	9 Months Ended
Shareholders' Equity (Tables)	Sep. 30, 2018
Equity [Abstract]
Summary of Changes in Shareholders' Equity	A summary of changes in shareholders’ equity is presented below: Common Stock Additional Paid-In Capital Retained Earnings Treasury Stock Deferred Compensation Trust Deferred Compensation Liability Total Balance, December 31, 2017 $ 206 $ 1,644,197 $ 6,231,940 $ (6,270,851 ) $ (17,383 ) $ 17,383 $ 1,605,492 Cumulative-effect adjustment from adoption of ASU 2014-09, net of tax — — 2,196 — — — 2,196 Net income — — 565,039 — — — 565,039 Deferred compensation activity, net — — — — 455 (455 ) — Purchase of common stock for treasury — — — (657,369 ) — — (657,369 ) Equity-based compensation — 51,690 — — — — 51,690 Proceeds from Options exercised — 115,268 — — — — 115,268 Treasury stock issued upon option exercise and restricted share vesting — (48,832 ) — 48,832 — — — Balance, September 30, 2018 $ 206 $ 1,762,323 $ 6,799,175 $ (6,879,388 ) $ (16,928 ) $ 16,928 $ 1,682,316

Product Warranties (Tables)

Product Warranties (Tables)	9 Months Ended
Product Warranties (Tables)	Sep. 30, 2018
Product Warranties Disclosures [Abstract]
Summary of Changes in Product Warranties Reserve	The following table reflects the changes in the Company’s Warranty Reserve during the three and nine months ended September 30, 2018 and 2017 : Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 Warranty reserve, beginning of period $ 99,702 $ 95,394 $ 94,513 $ 93,895 Provision 15,900 12,940 43,644 35,107 Payments (15,771 ) (11,677 ) (38,326 ) (32,345 ) Warranty reserve, end of period $ 99,831 $ 96,657 $ 99,831 $ 96,657

Segment Disclosures (Tables)

Segment Disclosures (Tables)	9 Months Ended
Segment Disclosures (Tables)	Sep. 30, 2018
Segment Reporting [Abstract]
Revenues	The f ollowing tables present segment revenues, profit and assets with reconciliations to the amounts reported for the consolidated enterprise, where applicable: Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 Revenues: Homebuilding Mid Atlantic $ 991,077 $ 927,551 $ 2,807,251 $ 2,521,967 Homebuilding North East 152,858 141,033 423,190 374,804 Homebuilding Mid East 391,933 338,900 1,045,458 895,168 Homebuilding South East 273,477 226,242 774,002 602,088 Mortgage Banking 43,062 34,194 119,225 95,477 Total consolidated revenues $ 1,852,407 $ 1,667,920 $ 5,169,126 $ 4,489,504
Profit before Taxes	Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 Income before taxes: Homebuilding Mid Atlantic $ 115,180 $ 109,417 $ 318,447 $ 274,527 Homebuilding North East 18,560 18,762 51,041 41,980 Homebuilding Mid East 51,744 44,990 121,129 103,135 Homebuilding South East 31,426 26,849 83,867 64,330 Mortgage Banking 27,183 19,336 69,418 53,293 Total segment profit before taxes 244,093 219,354 643,902 537,265 Reconciling items: Contract land deposit reserve adjustment (1) (689 ) 1,910 2,031 (882 ) Equity-based compensation expense (2) (23,586 ) (11,211 ) (51,690 ) (32,678 ) Corporate capital allocation (3) 55,438 51,904 160,091 147,737 Unallocated corporate overhead (20,424 ) (18,768 ) (74,211 ) (69,362 ) Consolidation adjustments and other 831 7,087 20,142 20,513 Corporate interest expense (5,953 ) (5,812 ) (17,971 ) (17,000 ) Reconciling items sub-total 5,617 25,110 38,392 48,328 Consolidated income before taxes $ 249,710 $ 244,464 $ 682,294 $ 585,593 (1) This item represents changes to the contract land deposit impairment reserve, which are not allocated to the reportable segments. (2) The increase in equity-based compensation expense in the three and nine month periods ended September 30, 2018 was primarily attributable to the issuance of Options and RSUs in the second quarter of 2018. See Note 7 for additional discussion of equity-based compensation. (3) This item represents the elimination of the corporate capital allocation charge included in the respective homebuilding reportable segments. The corporate capital allocation charge is based on the segment’s monthly average asset balance, and was as follows for the periods presented: Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 Corporate capital allocation charge: Homebuilding Mid Atlantic $ 31,733 $ 32,025 $ 93,682 $ 92,154 Homebuilding North East 4,565 4,244 13,325 12,191 Homebuilding Mid East 9,541 7,747 26,571 22,024 Homebuilding South East 9,599 7,888 26,513 21,368 Total $ 55,438 $ 51,904 $ 160,091 $ 147,737
Assets	September 30, 2018 December 31, 2017 Assets: Homebuilding Mid Atlantic $ 1,098,095 $ 1,079,225 Homebuilding North East 160,541 143,008 Homebuilding Mid East 324,253 263,019 Homebuilding South East 340,686 277,705 Mortgage Banking 365,862 397,052 Total segment assets 2,289,437 2,160,009 Reconciling items: Cash and cash equivalents 598,789 645,087 Deferred taxes 115,824 111,953 Intangible assets and goodwill 50,028 50,144 Contract land deposit reserve (27,968 ) (29,999 ) Consolidation adjustments and other 63,713 52,085 Reconciling items sub-total 800,386 829,270 Consolidated assets $ 3,089,823 $ 2,989,279

Fair Value (Tables)

Fair Value (Tables)	9 Months Ended
Fair Value (Tables)	Sep. 30, 2018
Fair Value Disclosures [Abstract]
Undesignated Derivative Instruments	The fair value measurement of NVRM's undesignated derivative instruments was as follows: September 30, 2018 December 31, 2017 Rate lock commitments: Gross assets $ 12,195 $ 5,400 Gross liabilities 3,165 1,832 Net rate lock commitments $ 9,030 $ 3,568 Forward sales contracts: Gross assets $ 1,949 $ 992 Gross liabilities 669 667 Net forward sales contracts $ 1,280 $ 325
Fair Value Measurement	The fair value measurement adjustment as of September 30, 2018 was as follows: Notional or Principal Amount Assumed Gain/(Loss) From Loan Sale Interest Rate Movement Effect Servicing Rights Value Security Price Change Total Fair Value Measurement Gain/(Loss) Rate lock commitments $ 864,355 $ 1,486 $ (2,376 ) $ 9,920 $ — $ 9,030 Forward sales contracts $ 1,120,810 — — — 1,280 1,280 Mortgages held for sale $ 319,817 667 (1,934 ) 4,394 — 3,127 Total fair value measurement $ 2,153 $ (4,310 ) $ 14,314 $ 1,280 $ 13,437

Basis of Presentation - Additio

Basis of Presentation - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Contract liability, revenue recognized	$ 91,000
Cumulative-effect adjustment from adoption of ASU 2014-09, net of tax			$ 2,196
Retained Earnings [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative-effect adjustment from adoption of ASU 2014-09, net of tax			2,196
Other Assets [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Contract cost	21,500		19,500
Home Building [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Customer deposits	167,676	$ 172,033	150,033
Restricted cash and cash equivalents	19,194		19,438
Consolidated Joint Venture [Member] \| Home Building [Member] \| Other Assets [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Restricted cash and cash equivalents	$ 335		$ 1,069	$ 1,177	$ 1,214

Variable Interest Entities ("_3

Variable Interest Entities ("VIEs") - Additional Information (Detail) $ in Thousands	Sep. 30, 2018USD ($)lot	Dec. 31, 2017USD ($)
Variable Interest Entity [Line Items]
Contract land deposits in cash	$ 402,318	$ 400,428
Variable Interest Entities [Member]
Variable Interest Entity [Line Items]
Maximum range of deposits required under the purchase agreements	10.00%
Power of developers equity holders to direct operating activities of development entity	100.00%
Lots controlled by NVR \| lot	92,350
Contract land deposits in cash under lot purchase Agreements	$ 398,800
Letters of credit related to lots	$ 3,800
Contract on Raw Ground with Landowners [Member]
Variable Interest Entity [Line Items]
Lots controlled by NVR \| lot	7,800
Contract land deposits in cash	$ 3,500
Letters of credit related to land contract	100
Refundable deposits and letters of credit	$ 1,300

Variable Interest Entities ("_4

Variable Interest Entities ("VIEs") - Total Risk of Loss Related to Contract Land Deposits (Detail) $ in Thousands	Sep. 30, 2018USD ($)lot	Dec. 31, 2017USD ($)lot
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure [Abstract]
Contract land deposits	$ 402,318	$ 400,428
Loss reserve on contract land deposits	(27,968)	(29,999)
Contract land deposits, net	374,350	370,429
Contingent obligations in the form of letters of credit	3,870	1,996
Specific performance obligations	1,505	1,505
Total risk of loss	$ 379,725	$ 373,930
Finished lots committed to purchase under specific performance obligations \| lot	10	10

Joint Ventures - Additional Inf

Joint Ventures - Additional Information (Detail) $ in Thousands	3 Months Ended
	Sep. 30, 2018USD ($)joint_venturelot	Dec. 31, 2017USD ($)
Joint Ventures [Line Items]
Aggregate investment	$ 31,750
Number of joint ventures \| joint_venture	6
Expected production of finished lots \| lot	6,900
Total lots controlled by company under the joint venture \| lot	3,550
Total lots either under contract with unrelated parties or not under the current contract \| lot	3,350
Additional funding commitments in the aggregate	$ 5,000
Number of joint ventures with additional funding commitment \| joint_venture	3
Number of joint ventures NVR is not primary beneficiary \| joint_venture	5
Other Assets [Member]
Joint Ventures [Line Items]
Aggregate investment	$ 31,750	$ 49,000
Cost of Sales [Member]
Joint Ventures [Line Items]
Equity Method Investment, Other than Temporary Impairment	7,400
EquityMethodInvestmentOtherThanTemporaryImpairmentCapitalizedInterestPortion	$ 760

Joint Ventures - Condensed Bala

Joint Ventures - Condensed Balance Sheets (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Liabilities and equity:
Equity	$ 1,682,316	$ 1,605,492
Total liabilities and shareholders' equity	3,089,823	2,989,279
Consolidated Joint Venture [Member]
Assets:
Cash	335	1,069
Other assets	0	37
Assets related to consolidated variable interest entity	335	1,106
Liabilities and equity:
Accrued expenses	290	487
Equity	45	619
Total liabilities and shareholders' equity	$ 335	$ 1,106

Land Under Development - Additi

Land Under Development - Additional Information (Detail) $ in Thousands	Sep. 30, 2018USD ($)parcellot
Real Estate [Abstract]
Number of raw parcels of land owned \| parcel	3
Carrying value of raw parcels of land	$ 36,064
Number of finished lots expected to be developed from raw parcels of land \| lot	500
Aggregate additional funding commitments related to raw land property under joint development	$ 7,900
Expected development credits that will offset the aggregate additional funding commitments related to raw land property development	$ 4,700

Capitalized Interest - Summary

Capitalized Interest - Summary of Interest Costs Incurred, Capitalized, Expensed and Charged to Cost of Sales (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Capitalized Interest Costs, Including Allowance for Funds Used During Construction [Roll Forward]
Interest capitalized, beginning of period	$ 5,388	$ 5,952	$ 5,583	$ 5,106
Interest incurred	6,517	6,615	19,737	19,754
Interest expense	(6,197)	(6,120)	(18,808)	(17,870)
Interest charged to cost of sales	(1,136)	(778)	(1,940)	(1,321)
Interest capitalized, end of period	$ 4,572	$ 5,669	$ 4,572	$ 5,669

Earnings Per Share - Weighted A

Earnings Per Share - Weighted Average Shares and Share Equivalents Used to Calculate Basic and Diluted Earnings Per Share (Detail) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Weighted average number of shares outstanding used to calculate basic EPS (in shares)	3,612	3,747	3,640	3,733
Dilutive securities:
Stock options and restricted share units (in shares)	444	516	499	466
Weighted average number of shares and share equivalents outstanding used to calculate diluted EPS (in shares)	4,056	4,263	4,139	4,199

Earnings Per Share - Summary of

Earnings Per Share - Summary of Antidilutive Securities Excluded from Computation of Earnings Per Share (Detail) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Anti-dilutive securities (in shares)	371	8	353	17

Equity-Based Compensation (Deta

Equity-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	May 02, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares authorized	60,000,000			60,000,000			60,000,000
Expiration period				10 years
Compensation cost	$ 23,586		$ 11,211	$ 51,690	$ 32,678
Compensation cost not yet recognized	$ 322,900			$ 322,900
Compensation cost not yet recognized, period				2 years 8 months 12 days
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted		166,000		341,000
Employee Stock Option [Member] \| Vesting over 2 Years [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted		34,000
Vesting period		2 years
Vesting percentage		50.00%
Employee Stock Option [Member] \| Vesting over 4 Years [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted		132,000
Vesting period		4 years
Vesting percentage		25.00%
Employee Performance Based Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted		166,000
Employee Performance Based Stock Option [Member] \| Vesting over 2 Years [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted		34,000
Vesting period		2 years
Vesting percentage		50.00%
Employee Performance Based Stock Option [Member] \| Vesting over 4 Years [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted		132,000
Vesting period		4 years
Vesting percentage		25.00%
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, value per share				$ 3,019.04
Restricted Stock Units (RSUs) [Member] \| Vesting over 2 Years [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		2 years
Vesting percentage		50.00%
Performance Based Restricted Stock Unit [Member] \| Vesting over 2 Years [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		2 years
Vesting percentage		50.00%
Two Thousand Eighteen, Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares authorized						275,000
Shares granted		144,000
Two Thousand Eighteen, Equity Plan [Member] \| Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted		72,000
Two Thousand Eighteen, Equity Plan [Member] \| Employee Performance Based Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted		72,000
Two Thousand Eighteen, Equity Plan [Member] \| Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares authorized						40,000
Two Thousand Ten, Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted		4,000
Two Thousand Ten, Equity Plan [Member] \| Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued		332,000
Shares granted		4,000
Two Thousand Ten, Equity Plan [Member] \| Employee Performance Based Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted		0
Two Thousand Ten, Equity Plan [Member] \| Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued		16,000
Two Thousand Fourteen, Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted		184,000
Two Thousand Fourteen, Equity Plan [Member] \| Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted		90,000		9,000
Two Thousand Fourteen, Equity Plan [Member] \| Employee Stock Option [Member] \| Vesting over 4 Years [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				4 years
Vesting percentage				25.00%
Two Thousand Fourteen, Equity Plan [Member] \| Employee Stock Option [Member] \| Continued Employment and Return Of Capital Performance [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage				50.00%
Two Thousand Fourteen, Equity Plan [Member] \| Employee Stock Option [Member] \| Continued Employment [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage				50.00%
Two Thousand Fourteen, Equity Plan [Member] \| Employee Performance Based Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted		94,000

Equity-Based Compensation Grant

Equity-Based Compensation Grant Options and RSU's (Details) - shares shares in Thousands	3 Months Ended	9 Months Ended
	Jun. 30, 2018	Sep. 30, 2018
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	166	341
Employee Performance Based Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	166
Two Thousand Ten, Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	4
Shares granted	16
Two Thousand Ten, Equity Plan [Member] \| Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	4
Two Thousand Ten, Equity Plan [Member] \| Employee Performance Based Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	0
Two Thousand Ten, Equity Plan [Member] \| Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	8	16
Two Thousand Ten, Equity Plan [Member] \| Performance Based Restricted Stock Unit [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	8
Two Thousand Fourteen, Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	184
Shares granted	0
Two Thousand Fourteen, Equity Plan [Member] \| Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	90	9
Two Thousand Fourteen, Equity Plan [Member] \| Employee Performance Based Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	94
Two Thousand Fourteen, Equity Plan [Member] \| Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	0
Two Thousand Fourteen, Equity Plan [Member] \| Performance Based Restricted Stock Unit [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	0
Two Thousand Eighteen, Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	144
Shares granted	0
Two Thousand Eighteen, Equity Plan [Member] \| Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	72
Two Thousand Eighteen, Equity Plan [Member] \| Employee Performance Based Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	72
Two Thousand Eighteen, Equity Plan [Member] \| Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	0
Two Thousand Eighteen, Equity Plan [Member] \| Performance Based Restricted Stock Unit [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	0

Equity-Based Compensation Compe

Equity-Based Compensation Compensation Plans (Details) - $ / shares shares in Thousands	3 Months Ended	9 Months Ended
	Jun. 30, 2018	Sep. 30, 2018
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at beginning of period (Shares)		916
Shares granted	166	341
Exercised (Shares)		(121)
Forfeited (Shares)		(30)
Outstanding at end of period (Shares)		1,106
Exercisable at end of period (Shares)		341
Outstanding at beginning of period (Weighted Average Exercise Price) $ / shares		$ 1,119.92
Granted (Weighted Average Exercise Price) $ / shares		3,022.95
Exercised (Weighted Average Exercise Price) $ / shares		952.18
Forfeited (Weighted Average Exercise Price) $ / shares		1,283.48
Outstanding at end of period (Weighted Average Exercise Price) $ / shares		1,719.97
Exercisable at end of period (Weighted Average Exercise Price) $ / shares		$ 959.64
Two Thousand Ten, Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	4
Shares granted	16
Two Thousand Ten, Equity Plan [Member] \| Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	4
Two Thousand Ten, Equity Plan [Member] \| Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at beginning of period (Shares)		10
Shares granted	8	16
Vested (Shares)		(5)
Forfeited (Shares)		0
Outstanding at end of period (Shares)		21
Vested, but not issued at end of period (Shares)		0

Equity-Based Compensation Black

Equity-Based Compensation Black-Scholes Option-Pricing Model Assumptions (Details)	9 Months Ended
	Sep. 30, 2018$ / shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Expected option life	5 years 22 days
Risk free interest rate, minimum	2.19%
Risk free interest rate, maximum	2.99%
Expected volatility rate, minimum	16.57%
Expected volatility rate, maximum	20.00%
Expected dividend rate	0.00%
Weighted average grant date fair value per share of Options granted	$ 689.09

Shareholders' Equity - Summary

Shareholders' Equity - Summary of Changes in Shareholders' Equity (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			$ 1,605,492
Cumulative-effect adjustment from adoption of ASU 2014-09, net of tax					$ 2,196
Net income	$ 195,816	$ 162,102	565,039	$ 412,902
Purchase of common stock for treasury			(657,369)
Equity-based compensation			51,690
Proceeds from Options exercised			115,268
Ending Balance	1,682,316		1,682,316
Common Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			206
Ending Balance	206		206
Additional Paid-In-Capital [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			1,644,197
Equity-based compensation			51,690
Proceeds from Options exercised			115,268
Treasury stock issued upon option exercise and restricted share vesting			(48,832)
Ending Balance	1,762,323		1,762,323
Retained Earnings [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			6,231,940
Cumulative-effect adjustment from adoption of ASU 2014-09, net of tax					$ 2,196
Net income			565,039
Ending Balance	6,799,175		6,799,175
Treasury Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			(6,270,851)
Purchase of common stock for treasury			(657,369)
Treasury stock issued upon option exercise and restricted share vesting			48,832
Ending Balance	(6,879,388)		(6,879,388)
Deferred Compensation Trust [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			(17,383)
Deferred compensation activity, net			455
Ending Balance	(16,928)		(16,928)
Deferred Compensation Liability [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			17,383
Deferred compensation activity, net			(455)
Ending Balance	$ 16,928		$ 16,928

Shareholders' Equity - Addition

Shareholders' Equity - Additional Information (Detail) shares in Thousands	9 Months Ended
	Sep. 30, 2018shares
Equity [Abstract]
Common stock repurchased (in shares)	222
Reissued shares during the period, shares (in shares)	126

Product Warranties Product Warr

Product Warranties Product Warranties - Schedule of Product Warranties Reserves (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Movement in Standard and Extended Product Warranty Accrual, Increase (Decrease) [Roll Forward]
Warranty reserve, beginning of period	$ 99,702	$ 95,394	$ 94,513	$ 93,895
Provision	15,900	12,940	43,644	35,107
Payments	(15,771)	(11,677)	(38,326)	(32,345)
Warranty reserve, end of period	$ 99,831	$ 96,657	$ 99,831	$ 96,657

Segment Disclosures - Additiona

Segment Disclosures - Additional Information (Detail)	9 Months Ended
Segment Disclosures - Additional Information (Detail)	Sep. 30, 2018segment
Senior Notes due 2022 [Member]
Segment Reporting Information [Line Items]
Senior notes interest rate	3.95%
Senior notes maturity	Sep. 15, 2022
Home Building [Member]
Segment Reporting Information [Line Items]
Number of reportable segments	4
Mortgage Banking [Member]
Segment Reporting Information [Line Items]
Number of reportable segments	1

Segment Disclosures - Revenues

Segment Disclosures - Revenues (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 1,852,407	$ 1,667,920	$ 5,169,126	$ 4,489,504
Home Building [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	1,809,345	1,633,726	5,049,901	4,394,027
Home Building [Member] \| Mid Atlantic [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	991,077	927,551	2,807,251	2,521,967
Home Building [Member] \| North East [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	152,858	141,033	423,190	374,804
Home Building [Member] \| Mid East [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	391,933	338,900	1,045,458	895,168
Home Building [Member] \| South East [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	273,477	226,242	774,002	602,088
Mortgage Banking [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 43,062	$ 34,194	$ 119,225	$ 95,477

Segment Disclosures - Income be

Segment Disclosures - Income before Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	$ 249,710	$ 244,464	$ 682,294	$ 585,593
Equity-based compensation expense (2)			(51,690)	(32,678)
Corporate interest expense	(6,197)	(6,120)	(18,808)	(17,870)
Home Building [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	224,196	226,043	616,032	534,570
Corporate interest expense	(5,968)	(5,821)	(18,022)	(17,040)
Mortgage Banking [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	25,514	18,421	66,262	51,023
Corporate interest expense	(229)	(299)	(786)	(830)
Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	244,093	219,354	643,902	537,265
Operating Segments [Member] \| Home Building [Member] \| Mid Atlantic [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	115,180	109,417	318,447	274,527
Operating Segments [Member] \| Home Building [Member] \| North East [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	18,560	18,762	51,041	41,980
Operating Segments [Member] \| Home Building [Member] \| Mid East [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	51,744	44,990	121,129	103,135
Operating Segments [Member] \| Home Building [Member] \| South East [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	31,426	26,849	83,867	64,330
Operating Segments [Member] \| Mortgage Banking [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	27,183	19,336	69,418	53,293
Corporate and Reconciling Items [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	5,617	25,110	38,392	48,328
Contract land deposit reserve adjustment	(689)	1,910	2,031	(882)
Equity-based compensation expense (2)	(23,586)	(11,211)	(51,690)	(32,678)
Corporate capital allocation	55,438	51,904	160,091	147,737
Unallocated corporate overhead	(20,424)	(18,768)	(74,211)	(69,362)
Consolidation adjustments and other	831	7,087	20,142	20,513
Corporate interest expense	(5,953)	(5,812)	(17,971)	(17,000)
Corporate and Reconciling Items [Member] \| Home Building [Member] \| Mid Atlantic [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Corporate capital allocation	31,733	32,025	93,682	92,154
Corporate and Reconciling Items [Member] \| Home Building [Member] \| North East [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Corporate capital allocation	4,565	4,244	13,325	12,191
Corporate and Reconciling Items [Member] \| Home Building [Member] \| Mid East [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Corporate capital allocation	9,541	7,747	26,571	22,024
Corporate and Reconciling Items [Member] \| Home Building [Member] \| South East [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Corporate capital allocation	$ 9,599	$ 7,888	$ 26,513	$ 21,368

Segment Disclosures - Corporate

Segment Disclosures - Corporate Capital Allocation Charge (Detail) - Corporate and Reconciling Items [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting, Other Significant Reconciling Item [Line Items]
Corporate capital allocation charge	$ 55,438	$ 51,904	$ 160,091	$ 147,737
Home Building [Member] \| Mid Atlantic [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Corporate capital allocation charge	31,733	32,025	93,682	92,154
Home Building [Member] \| North East [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Corporate capital allocation charge	4,565	4,244	13,325	12,191
Home Building [Member] \| Mid East [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Corporate capital allocation charge	9,541	7,747	26,571	22,024
Home Building [Member] \| South East [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Corporate capital allocation charge	$ 9,599	$ 7,888	$ 26,513	$ 21,368

Segment Disclosures - Assets (D

Segment Disclosures - Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 3,089,823	$ 2,989,279
Contract land deposit reserve	(27,968)	(29,999)
Home Building [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	2,716,614	2,584,880
Cash and cash equivalents	598,789	645,087
Mortgage Banking [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	373,209	404,399
Cash and cash equivalents	11,081	21,707
Operating Segments [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	2,289,437	2,160,009
Operating Segments [Member] \| Home Building [Member] \| Mid Atlantic [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	1,098,095	1,079,225
Operating Segments [Member] \| Home Building [Member] \| North East [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	160,541	143,008
Operating Segments [Member] \| Home Building [Member] \| Mid East [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	324,253	263,019
Operating Segments [Member] \| Home Building [Member] \| South East [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	340,686	277,705
Operating Segments [Member] \| Mortgage Banking [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	365,862	397,052
Corporate and Reconciling Items [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	800,386	829,270
Cash and cash equivalents	598,789	645,087
Deferred taxes	115,824	111,953
Intangible assets and goodwill	50,028	50,144
Contract land deposit reserve	(27,968)	(29,999)
Consolidation adjustments and other	$ 63,713	$ 52,085

Fair Value - Additional Informa

Fair Value - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fair value measurement gain/(loss)			$ 13,437		$ 5,824
Home Building [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior Notes carrying value	$ 597,527		597,527		597,066
Home Building [Member] \| Senior Notes due 2022 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior Notes carrying value	597,527		597,527		597,066
Home Building [Member] \| Level 2 [Member] \| Fair Value, Measurements, Recurring [Member] \| Senior Notes due 2022 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior Notes fair value	624,000		624,000		630,000
Mortgage Banking [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of mortgage loans held for sale	322,944		322,944		352,489
Mortgage Banking [Member] \| Level 2 [Member] \| Not Designated as Hedging Instrument [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value adjustment income (expense)	(1,986)	$ 1,572	7,613	$ 2,931
Mortgage Banking [Member] \| Level 2 [Member] \| Fair Value, Measurements, Recurring [Member] \| Rate Lock Commitments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notional or Principal Amount	864,355		864,355
Total fair value measurement gain/(loss)			9,030
Mortgage Banking [Member] \| Level 2 [Member] \| Fair Value, Measurements, Recurring [Member] \| Forward Sales Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notional or Principal Amount	1,120,810		1,120,810
Total fair value measurement gain/(loss)			1,280
Mortgage Banking [Member] \| Level 2 [Member] \| Fair Value, Measurements, Recurring [Member] \| Mortgages Held for Sale [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notional or Principal Amount	319,817		319,817		350,558
Fair value of mortgage loans held for sale	$ 322,944		322,944		352,489
Total fair value measurement gain/(loss)			$ 3,127		$ 1,931

Fair Value - Undesignated Deriv

Fair Value - Undesignated Derivative Instruments (Detail) - Other Assets [Member] - Mortgage Banking [Member] - Level 2 [Member] - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Rate Lock Commitments [Member]
Derivatives, Fair Value [Line Items]
Gross assets	$ 12,195	$ 5,400
Gross liabilities	3,165	1,832
Net rate lock commitments and forward sales contracts	9,030	3,568
Forward Sales Contracts [Member]
Derivatives, Fair Value [Line Items]
Gross assets	1,949	992
Gross liabilities	669	667
Net rate lock commitments and forward sales contracts	$ 1,280	$ 325

Fair Value - Fair Value Measure

Fair Value - Fair Value Measurement (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assumed Gain/(Loss) From Loan Sale	$ 2,153
Interest Rate Movement Effect	(4,310)
Servicing Rights Value	14,314
Security Price Change	1,280
Total Fair Value Measurement Gain/(Loss)	13,437	$ 5,824
Mortgage Banking [Member] \| Level 2 [Member] \| Fair Value, Measurements, Recurring [Member] \| Rate Lock Commitments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notional or Principal Amount	864,355
Assumed Gain/(Loss) From Loan Sale	1,486
Interest Rate Movement Effect	(2,376)
Servicing Rights Value	9,920
Total Fair Value Measurement Gain/(Loss)	9,030
Mortgage Banking [Member] \| Level 2 [Member] \| Fair Value, Measurements, Recurring [Member] \| Forward Sales Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notional or Principal Amount	1,120,810
Security Price Change	1,280
Total Fair Value Measurement Gain/(Loss)	1,280
Mortgage Banking [Member] \| Level 2 [Member] \| Fair Value, Measurements, Recurring [Member] \| Mortgages Held for Sale [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notional or Principal Amount	319,817	350,558
Assumed Gain/(Loss) From Loan Sale	667
Interest Rate Movement Effect	(1,934)
Servicing Rights Value	4,394
Total Fair Value Measurement Gain/(Loss)	$ 3,127	$ 1,931

Debt - Additional Information (

Debt - Additional Information (Detail)	9 Months Ended
Debt - Additional Information (Detail)	Sep. 30, 2018USD ($)
Senior Notes due 2022 [Member]
Debt Instrument [Line Items]
Senior notes principal amount	$ 600,000,000
Senior notes maturity date	Sep. 15, 2022
Senior notes interest rate	3.95%
Frequency of senior notes payment	semi-annually in arrears on March 15 and September 15
Senior notes effective interest rate	3.97%
Credit Agreement [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Maximum loan borrowing capacity	$ 200,000,000
Increase in commitment available	$ 300,000,000
Expiration date	Jul. 15, 2021
Debt outstanding	$ 0
Credit Agreement [Member] \| Revolving Credit Facility [Member] \| Sublimit for Issuance of Letters of Credit [Member]
Debt Instrument [Line Items]
Maximum loan borrowing capacity	100,000,000
Letters of credit outstanding	9,600,000
Credit Agreement [Member] \| Revolving Credit Facility [Member] \| Sublimit for Swing Line Commitment [Member]
Debt Instrument [Line Items]
Maximum loan borrowing capacity	25,000,000
Repurchase Agreement [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Maximum loan borrowing capacity	150,000,000
Increase in commitment available	$ 50,000,000
Expiration date	Jul. 24, 2019
Debt outstanding	$ 0
Borrowing base limitations	$ 0

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Tax [Line Items]
Effective tax rate	21.60%	33.70%	17.20%	29.50%
Income tax expense (benefit)	$ 53,894	$ 82,362	$ 117,255	$ 172,691
Excess tax benefit recognized	$ 12,585	$ 8,357	58,607	$ 44,720
Energy Tax Credit Carryforward
Income Tax [Line Items]
Income tax expense (benefit)			$ 6,200

Recent Accounting Pronounceme_2

Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands	Jan. 01, 2019	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative-effect adjustment		$ 2,196
Forecast \| Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative-effect adjustment	$ 100,000