NVR (NVR) 10-K 14 Feb 18 2017 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Feb. 12, 2018	Jun. 30, 2017
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	FY
Trading Symbol	NVR
Entity Registrant Name	NVR INC
Entity Central Index Key	906,163
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		3,683,093
Entity Public Float			$ 8,443,210

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
ASSETS
Cash and cash equivalents	$ 667,863	$ 396,619
Inventory:
Land under development	34,212	46,999
Contract land deposits, net	370,429	379,844
Total assets	2,989,279	2,643,943
LIABILITIES AND SHAREHOLDERS' EQUITY
Total liabilities	1,383,787	1,339,502
Commitments and contingencies
Shareholders' equity:
Common stock, $0.01 par value; 60,000,000 shares authorized; 20,555,330 shares issued as of both December 31, 2017 and December 31, 2016	206	206
Additional paid-in capital	1,644,197	1,515,828
Deferred compensation trust – 108,640 shares of NVR, Inc. common stock as of both December 31, 2017 and December 31, 2016	(17,383)	(17,375)
Deferred compensation liability	17,383	17,375
Retained earnings	6,231,940	5,695,376
Less treasury stock at cost – 16,864,324 and 16,862,327 shares as of December 31, 2017 and December 31, 2016, respectively	(6,270,851)	(5,906,969)
Total shareholders' equity	1,605,492	1,304,441
Total liabilities and shareholders' equity	2,989,279	2,643,943
Homebuilding:
ASSETS
Cash and cash equivalents	645,087	375,748
Restricted cash	19,438	17,561
Receivables	20,026	18,937
Inventory:
Lots and housing units, covered under sales agreements with customers	1,046,094	883,868
Unsold lots and housing units	148,620	145,065
Land under development	34,212	46,999
Building materials and other	17,273	16,168
Total Inventory	1,246,199	1,092,100
Contract land deposits, net	370,429	379,844
Property, plant and equipment, net	43,191	45,915
Reorganization value in excess of amounts allocable to identifiable assets, net	41,580	41,580
Deferred tax assets, net	111,953	170,652
Other assets	86,977	91,009
Total assets	2,584,880	2,233,346
LIABILITIES AND SHAREHOLDERS' EQUITY
Accounts payable	261,973	251,212
Accrued expenses and other liabilities	341,891	337,200
Customer deposits	150,033	122,236
Senior notes	597,066	596,455
Total liabilities	1,350,963	1,307,103
Mortgage Banking:
ASSETS
Cash and cash equivalents	21,707	19,657
Restricted cash	2,256	1,857
Mortgage loans held for sale, net	352,489	351,958
Inventory:
Property, plant and equipment, net	6,327	4,903
Reorganization value in excess of amounts allocable to identifiable assets, net	7,347	7,347
Other assets	14,273	24,875
Total assets	404,399	410,597
LIABILITIES AND SHAREHOLDERS' EQUITY
Accounts payable and other liabilities	32,824	32,399
Total liabilities	$ 32,824	$ 32,399

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Common stock, par value	$ 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	108,640	108,640
Treasury stock, shares	16,864,324	16,862,327

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Interest expense	$ (24,185)	$ (21,707)	$ (23,559)
Income before taxes	846,911	661,697	603,212
Income tax expense	(309,390)	(236,435)	(220,285)
Net income	$ 537,521	$ 425,262	$ 382,927
Basic earnings per share (USD per share)	$ 144	$ 110.53	$ 95.21
Diluted earnings per share (USD per share)	$ 126.77	$ 103.61	$ 89.99
Basic weighted average shares outstanding (in Shares)	3,733	3,847	4,022
Diluted weighted average shares outstanding (in Shares)	4,240	4,104	4,255
Homebuilding:
Revenues	$ 6,175,521	$ 5,709,223	$ 5,065,200
Other income	6,536	2,820	2,956
Cost of sales	(4,990,378)	(4,707,861)	(4,118,782)
Selling, general and administrative	(392,272)	(382,459)	(371,127)
Operating income	799,407	621,723	578,247
Interest expense	(23,037)	(20,621)	(22,918)
Income before taxes	776,370	601,102	555,329
Mortgage Banking:
Mortgage banking fees	130,319	113,321	93,808
Interest income	7,850	7,569	6,485
Other income	2,048	1,652	1,113
General and administrative	(68,528)	(60,861)	(52,882)
Interest expense	(1,148)	(1,086)	(641)
Income before taxes	$ 70,541	$ 60,595	$ 47,883

Consolidated Statements of Shar

Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Treasury Stock	Deferred Compensation Trust	Deferred Compensation Liability
Beginning Balance at Dec. 31, 2014	$ 1,124,255	$ 206	$ 1,325,495	$ 4,887,187	$ (5,088,633)	$ (17,333)	$ 17,333
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	382,927			382,927
Purchase of common stock for treasury	(431,367)				(431,367)
Equity-based compensation	54,091		54,091
Tax benefit from equity benefit plan activity	23,311		23,311
Proceeds from stock options exercised	85,948		85,948
Treasury stock issued upon option exercise and restricted share vesting			(41,050)		41,050
Ending Balance at Dec. 31, 2015	1,239,165	206	1,447,795	5,270,114	(5,478,950)	(17,333)	17,333
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	425,262			425,262
Deferred compensation activity						(42)	42
Purchase of common stock for treasury	(455,351)				(455,351)
Equity-based compensation	43,598		43,598
Tax benefit from equity benefit plan activity	13,661		13,661
Proceeds from stock options exercised	38,106		38,106
Treasury stock issued upon option exercise and restricted share vesting			(27,332)		27,332
Ending Balance at Dec. 31, 2016	1,304,441	206	1,515,828	5,695,376	(5,906,969)	(17,375)	17,375
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative-effect adjustment from adoption of ASU 2016-09, net of tax	609		1,566	(957)
Net income	537,521			537,521
Deferred compensation activity						(8)	8
Purchase of common stock for treasury	(422,166)				(422,166)
Equity-based compensation	44,562		44,562
Tax benefit from equity benefit plan activity	0
Proceeds from stock options exercised	140,525		140,525
Treasury stock issued upon option exercise and restricted share vesting			(58,284)		58,284
Ending Balance at Dec. 31, 2017	$ 1,605,492	$ 206	$ 1,644,197	$ 6,231,940	$ (6,270,851)	$ (17,383)	$ 17,383

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities:
Net income	$ 537,521	$ 425,262	$ 382,927
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	22,667	22,269	21,534
Equity-based compensation expense	44,562	43,598	54,091
Contract land deposit impairments (recoveries), net	1,238	(4,269)	(11,058)
Gain on sale of loans, net	(99,132)	(85,535)	(67,891)
Deferred tax expense (benefit)	61,290	(10,024)	1,902
Mortgage loans closed	(4,077,372)	(3,660,269)	(3,111,413)
Mortgage loans sold and principal payments on mortgage loans held for sale	4,182,220	3,710,250	3,059,889
Distribution of earnings from unconsolidated joint ventures	5,614	9,094	15,511
Net change in assets and liabilities:
Increase in inventory	(154,099)	(85,194)	(134,803)
Decrease (increase) in contract land deposits	8,177	(32,280)	(37,561)
Increase in receivables	(502)	(9,083)	(1,527)
Increase in accounts payable and accrued expenses	10,789	58,532	55,404
Increase in customer deposits	27,797	11,271	4,210
Other, net	(1,866)	4,504	(4,513)
Net cash provided by operating activities	568,904	398,126	226,702
Cash flows from investing activities:
Investments in and advances to unconsolidated joint ventures	(3,800)	(653)	(1,917)
Distribution of capital from unconsolidated joint ventures	7,203	12,594	18,489
Purchase of property, plant and equipment	(20,269)	(22,369)	(18,277)
Proceeds from the sale of property, plant and equipment	847	1,000	683
Net cash used in investing activities	(16,019)	(9,428)	(1,022)
Cash flows from financing activities:
Purchase of treasury stock	(422,166)	(455,351)	(431,367)
Repayments under non-recourse debt related to consolidated variable interest entity	0	0	(64)
Distributions to partner in consolidated variable interest entity	0	(150)	(300)
Proceeds from the exercise of stock options	140,525	38,106	85,948
Net cash used in financing activities	(281,641)	(417,395)	(345,783)
Net increase (decrease) in cash and cash equivalents	271,244	(28,697)	(120,103)
Cash and cash equivalents, beginning of the year	396,619	425,316	545,419
Cash and cash equivalents, end of the year	667,863	396,619	425,316
Supplemental disclosures of cash flow information:
Interest paid during the year, net of interest capitalized	23,251	20,922	24,546
Income taxes paid during the year, net of refunds	$ 260,232	$ 218,984	$ 194,670

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Principles of Consolidation The accompanying consolidated financial statements include the accounts of NVR, Inc. and its subsidiaries (“NVR” or the “Company”) and certain other entities in which the Company is deemed to be the primary beneficiary (see Notes 3 and 4 herein for additional information). All significant intercompany transactions have been eliminated in consolidation. Use of Estimates in the Preparation of Financial Statements The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America (“GAAP”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting periods. Management continually evaluates the estimates used to prepare the consolidated financial statements and updates those estimates as necessary. In general, the Company’s estimates are based on historical experience, on information from third party professionals, and other various assumptions that are believed to be reasonable under the facts and circumstances. Actual results could differ materially from those estimates made by management. Cash and Cash Equivalents 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. At December 31, 2017 and 2016 , $1,069 and $1,214 , respectively, of cash related to a consolidated variable interest entity is included in homebuilding “Other assets ” on the accompanying consolidated balance sheet. Homebuilding Inventory The carrying value of inventory is stated at the lower of cost or market value. Cost of lots and completed and uncompleted housing units represent the accumulated actual cost of the units. Field construction supervisors’ salaries and related direct overhead expenses are included in inventory costs. Interest costs are not capitalized into inventory, with the exception of land under development and joint venture investments, as applicable (see below). Upon settlement, the cost of the unit is expensed on a specific identification basis. Cost of building materials is determined on a first-in, first-out basis. Sold inventory is evaluated for impairment based on the contractual sales price compared to the total estimated cost to construct. Unsold inventory is evaluated for impairment by analyzing recent comparable sales prices within the applicable community compared to the costs incurred to date plus the expected costs to complete. Any calculated impairments are recorded immediately. Contract Land Deposits The Company purchases finished lots under fixed price lot purchase agreements (“Lot Purchase Agreements”) that require deposits that may be forfeited if NVR fails to perform under the contract. The deposits are in the form of cash or letters of credit in varying amounts and represent a percentage of the aggregate purchase price of the finished lots. NVR maintains an allowance for losses on contract land deposits that reflects the Company’s judgment of the present loss exposure in the existing contract land deposit portfolio at the end of the reporting period. To analyze contract land deposit impairments, NVR utilizes guidance from Accounting Standards Codification (“ASC”) 450, Contingencies , and conducts a loss contingency analysis each quarter. In addition to considering market and economic conditions, NVR assesses contract land deposit impairments on a community-by-community basis pursuant to the purchase contract terms, analyzing, as applicable, current sales absorption levels, recent sales’ direct profit, the dollar differential between the contractual purchase price and the current market price for lots, a developer’s financial stability, a developer’s financial ability or willingness to reduce lot prices to current market prices, and the contract’s default status by either the Company or the developer along with an analysis of the expected outcome of any such default. NVR’s analysis is focused on whether the Company can sell houses at an acceptable margin and sales pace in a particular community in the current market with which the Company is faced. Because the Company does not own the finished lots on which the Company has placed a contract land deposit, if the above analysis leads to a determination that the Company cannot sell homes at an acceptable margin and sales pace at the current contractual lot price, the Company then determines whether it will elect to default under the contract, forfeit the deposit and terminate the contract, or whether the Company will attempt to restructure the lot purchase contract, which may require it to forfeit the deposit to obtain contract concessions from a developer. The Company also assesses whether impairment is present due to collectability issues resulting from a developer’s non-performance because of financial or other conditions. For the year ended December 31, 2017 , the Company incurred net pre-tax charges of $1,238 related to the impairment of contract land deposits. For the years ended December 31, 2016 and 2015 , the Company recognized net pre-tax recoveries of $4,269 and $11,058 , respectively, of contract land deposits previously determined to be unrecoverable. The contract land deposit assets on the accompanying consolidated balance sheets are shown net of the allowance for losses of $29,999 and $31,306 at December 31, 2017 and 2016 , respectively. Land Under Development On a limited basis, NVR directly acquires raw parcels of land 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. Land under development, including the land under development held by the Company’s unconsolidated joint ventures and the related joint venture investments, is reviewed for potential write-downs when impairment indicators are present. In addition to considering market and economic conditions, the Company assesses land under development impairments on a community-by-community basis, analyzing, as applicable, current sales absorption levels, recent sales’ direct profit, and the dollar differential between the projected fully-developed cost of the lots and the current market price for lots. If indicators of impairment are present for a community, NVR performs an analysis to determine if the undiscounted cash flows estimated to be generated by those assets are less than their carrying amounts, and if so, impairment charges are required to be recorded if the fair value of such assets is less than their carrying amounts. For those assets deemed to be impaired, the impairment to be recognized is measured as the amount by which the carrying amount of the assets exceeds the fair value of the assets. The Company’s determination of fair value is primarily based on discounting the estimated future cash flows at a rate commensurate with the inherent risks associated with the assets and related estimated cash flow streams. NVR does not believe that any of the land under development is impaired as of December 31, 2017. Property, Plant, and Equipment Property, plant, and equipment are carried at cost less accumulated depreciation and amortization. Depreciation is based on the estimated useful lives of the assets using the straight-line method. Model home furniture and fixtures are generally depreciated over a two -year period, office facilities and other equipment are depreciated over a period of three to ten years and production facilities are depreciated over periods of five to forty years. Intangible Assets On December 31, 2012, the Company acquired substantially all of the assets of Heartland Homes, Inc., which resulted in the Company recording finite-lived intangible assets and goodwill. The Company completed its annual assessment for impairment of goodwill and management determined that there was no impairment. As of December 31, 2017 and 2016 , finite-lived intangible assets, net of accumulated amortization, totaled $776 and $2,158 , respectively. The remaining finite-lived intangible assets will be amortized on a straight-line basis over 5 years. As of both December 31, 2017 and 2016 , the goodwill value was $441 . Finite-lived intangible assets and goodwill are included in homebuilding "Other assets" in the accompanying consolidated balance sheets. Warranty/Product Liability Reserves The Company establishes warranty and product liability reserves 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 likely 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. Mortgage Loans Held for Sale, Derivatives and Hedging Activities NVR originates several different loan products to its customers to finance the purchase of a home through its wholly-owned mortgage subsidiary, NVR Mortgage Finance, Inc. (“NVRM”). NVRM sells all of the loans it originates into the secondary market on a servicing released basis, typically within 30 days from origination. All of the loans that NVRM originates are underwritten to the standards and specifications of the ultimate investor. Those underwriting standards are typically equal to or more stringent than the underwriting standards required by Fannie Mae (“FNMA”), Freddie Mac ("FHLMC"), the Department of Veterans Affairs (“VA”) and the Federal Housing Administration (“FHA”). Insofar as NVRM underwrites its originated loans to those standards, NVRM bears no increased concentration of credit risk from the issuance of loans, except in certain limited instances where early payment default occurs. NVRM employs a quality control department to ensure that its underwriting controls are effectively operating, and further assesses the underwriting function as part of its assessment of internal controls over financial reporting. NVRM maintains a reserve for losses on mortgage loans originated that reflects NVR’s judgment of the present loss exposure in the loans that NVRM has originated and sold. The reserve is calculated based on an analysis of historical experience and exposure (see Note 15 herein for further information). Mortgage loans held for sale are carried at the lower of cost or fair value, net of deferred origination costs, until sold. In the normal course of business, NVRM enters into contractual commitments to extend credit to buyers of single-family homes 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 sale 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 December 31, 2017 , there were contractual commitments to extend credit to borrowers aggregating $490,184 , and open forward delivery sale contracts aggregating $705,405 , which hedge both the rate lock loan commitments and closed loans held for sale (see Note 14 herein for a description of the Company’s fair value accounting). Earnings per Share The following weighted average shares and share equivalents were used to calculate basic and diluted earnings per share for the years ended December 31, 2017 , 2016 and 2015 : Year Ended December 31, 2017 2016 2015 Weighted average number of shares outstanding used to calculate basic EPS 3,733 3,847 4,022 Dilutive securities: Stock options and restricted share units 507 257 233 Weighted average number of shares and share equivalents outstanding used to calculate diluted EPS 4,240 4,104 4,255 The assumed proceeds used in the treasury method for calculating NVR’s diluted earnings per share includes the amount the employee must pay upon exercise and the amount of compensation cost attributed to future services not yet recognized. The following stock options issued under equity incentive plans were outstanding during the years ended December 31, 2017 , 2016 and 2015 , but were not included in the computation of diluted earnings per share because the effect would have been anti-dilutive. Year Ended December 31, 2017 2016 2015 Anti-dilutive securities 15 87 50 Revenues – Homebuilding Operations NVR builds single-family detached homes, townhomes and condominium buildings, which generally are constructed on a pre-sold basis for the ultimate customer. Revenues are recognized at the time the unit is settled and title passes to the customer, adequate cash payment has been received and there is no continuing involvement. In situations where the buyer’s financing is originated by NVRM and the buyer has not made an adequate initial or continuing investment as prescribed by GAAP, the profit on such settlement is deferred until the sale of the related loan to a third-party investor has been completed. Mortgage Banking Fees Mortgage banking fees include income earned by NVRM for originating mortgage loans, servicing mortgage loans held on an interim basis, title fees, gains and losses on the sale of mortgage loans and mortgage servicing and other activities incidental to mortgage banking. Mortgage banking fees are generally recognized after the loan has been sold to an unaffiliated, third party investor. Income Taxes Income taxes are accounted for under the asset and liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax basis. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on the deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. See Note 11 herein for discussion of the impact on the Company's deferred tax asset resulting from the enactment of the Tax Cuts and Jobs Act in December 2017. ASC 740-10, Income Taxes , provides that a tax benefit from an uncertain tax position may be recognized when it is more-likely-than-not (defined as a likelihood of more than 50%) that the position will be sustained upon examination, including resolution of any related appeals or litigation processes, based on the technical merits. If a tax position does not meet the more-likely-than-not recognition threshold, despite the Company’s belief that its filing position is supportable, the benefit of that tax position is not recognized in the statements of income. The Company recognizes interest related to unrecognized tax benefits as a component of income tax expense. Based on its historical experience in dealing with various taxing authorities, the Company has found that it is the administrative practice of the taxing authorities to not seek penalties from the Company for the tax positions it has taken on its returns, related to its unrecognized tax benefits. Therefore, the Company does not accrue penalties for the positions in which it has an unrecognized tax benefit. However, if such penalties were to be accrued, they would be recorded as a component of income tax expense. The Company recognizes unrecognized tax benefits in the period that the uncertainty is eliminated by either affirmative agreement of the uncertain tax position by the applicable taxing authority, by expiration of the applicable statute of limitation, or by determination in accordance with certain states’ administrative practices that the uncertain tax position has been effectively settled (see Note 11 herein for further information). Financial Instruments Except as otherwise noted herein, NVR believes that insignificant differences exist between the carrying value and the fair value of its financial instruments (see Note 14 herein for further information). Equity-Based Compensation The Company accounts for its equity-based compensation in accordance with ASC 718, Compensation – Stock Compensation. ASC 718 requires an entity to recognize an expense within its income statement for all share-based payment arrangements, which includes employee stock option and restricted share unit plans. The expense is based on the grant-date fair value of the stock options and restricted share units granted, and is recognized ratably over the requisite service period. Recognition of compensation expense for the stock options which are subject to a performance condition are treated as a separate award from the “service-only” stock options, and expense is recognized when it becomes probable that the stated performance target will be achieved. The Company calculates the fair value of its non-publicly traded, employee stock options using the Black-Scholes option-pricing model. The grant date fair value of the restricted share units is the closing price of the Company’s common stock on the day immediately preceding the date of grant. The Company’s equity-based compensation programs are accounted for as equity-classified awards (see Note 12 herein for further discussion of equity-based compensation plans). Comprehensive Income For the years ended December 31, 2017 , 2016 and 2015 , comprehensive income equaled net income; therefore, a separate statement of comprehensive income is not included in the accompanying consolidated financial statements. Reclassifications Certain prior period amounts have been reclassified to conform to the current year's presentation. Recent Accounting Pronouncements Recently Adopted Accounting Pronouncements T he Company adopted Accounting Standards Update (“ASU”) 2016-09, Compensation – Stock Compensation: Improvements to Employee Share-Based Payment Accounting, effective January 1, 2017. In connection with the adoption of ASU 2016-09, the Company: • Recorded the excess tax benefit from stock option exercises as a reduction to income tax expense prospectively beginning January 1, 2017. In 2016 and 2015, the excess tax benefit was recorded to additional paid-in capital within shareholders’ equity. The excess tax benefit recognized during 2017, 2016 and 2015 was $58,681 , $13,661 and $23,311 , respectively. • Presented the aforementioned excess tax benefit recognized as an operating activity on the statement of cash flows and retrospectively adjusted the prior year Statement of Cash Flows accordingly. In the prior years, the excess tax benefit was recognized as a cash inflow from financing activities and a corresponding cash outflow from operating activities. The retrospective adjustment to the prior year Statement of Cash Flows resulted in increases of $13,661 and $23,311 to net cash provided by operating activities in 2016 and 2015, respectively, and increases of $13,661 and $23,311 to net cash used in financing activities in 2016 and 2015, respectively. • Made the election to recognize forfeitures of equity-based awards in the period in which they occur. This election was applied using the modified retrospective transition method, which resulted in the Company recording a cumulative-effect adjustment, net of tax, to reduce beginning retained earnings as of January 1, 2017 by $957 . In prior years, the Company estimated forfeitures based on its historical forfeiture rate. No other adjustments were made as a result of the adoption of ASU 2016-09. The Company also adopted ASU 2015-11, Inventory – Simplifying the Measurement of Inventory effective January 1, 2017. The standard requires inventory to be measured at the lower of cost or net realizable value. Under prior GAAP, impaired inventory was written down to net realizable value less a normal profit margin. Under the new standard, impaired inventory is written down to the net realizable value. ASU 2015-11 was adopted prospectively and did not have a material effect on the Company’s consolidated financial statements. Recently Issued Accounting Pronouncements In May 2014, FASB issued ASU 2014-09, Revenue from Contracts with Customers , which requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. The standard is effective for the Company as of January 1, 2018 and replaces most existing revenue recognition guidance in GAAP. The Company will adopt the standard using the cumulative effect transition method. The Company has determined that the adoption of this standard will not have a material effect on its consolidated financial statements and related disclosures. In February 2016, 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. The Company believes that the adoption of this standard will have a material effect on both assets and liabilities presented on the balance sheet, and is further evaluating the impact of its adoption. In June 2016, 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 is currently evaluating the effect that the standard will have on its consolidated financial statements and related disclosures. In August 2016, FASB issued ASU 2016-15, Classification of Certain Cash Receipts and Cash Payments . The objective of the standard is to address the diversity in practice of how certain cash receipts and payments are presented on the statement of cash flows. The standard requires that the guidance be applied retrospectively in the first interim and annual periods in which an entity adopts the guidance. The standard is effective for the Company as of January 1, 2018. The Company expects the standard to affect the presentation of distributions from joint ventures on its consolidated statements of cash flows. In November 2016, FASB issued ASU 2016-18, Statement of Cash Flows (Topic 230), Restricted Cash . 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, restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total cash amounts shown on the statement of cash flows. The standard is effective for the Company as of January 1, 2018. The Company does not believe that the adoption of this standard will have a material effect on its consolidated statements of cash flows and related disclosures. In January 2017, 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. In May 2017, FASB issued ASU 2017-09, Compensation – Stock Compensation (Topic 718), Scope of Modification Accounting. 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 standard is effective for the Company on January 1, 2018. The Company does not believe that the adoption of this standard will have a material effect on its consolidated financial statements and related disclosures.

Segment Information, Nature of

Segment Information, Nature of Operations, and Certain Concentrations	12 Months Ended
	Dec. 31, 2017
Segment Reporting [Abstract]
Segment Information, Nature of Operations, and Certain Concentrations	Segment Information, Nature of Operations, and Certain Concentrations NVR’s homebuilding operations primarily construct and sell single-family detached homes, townhomes and condominium buildings under three trade names: Ryan Homes, NVHomes and Heartland Homes. The Ryan Homes product is marketed primarily to first-time and first-time move-up buyers. Ryan Homes operates in twenty-nine metropolitan areas located in Maryland, Virginia, Washington, D.C., West Virginia, Pennsylvania, New York, North Carolina, South Carolina, Florida, Ohio, New Jersey, Delaware, Indiana, Illinois and Tennessee. The NVHomes and Heartland Homes products are marketed primarily to move-up and luxury buyers. NVHomes operates in Delaware and the Washington, D.C., Baltimore, MD, Philadelphia, PA and Raleigh, NC metropolitan areas. Heartland Homes operates in the Pittsburgh, PA metropolitan area. NVR derived approximately 30% and 11% of its 2017 homebuilding revenues from the Washington, D.C. and Baltimore, MD metropolitan areas, respectively. NVR’s mortgage banking segment is a regional mortgage banking operation. Substantially all of the mortgage banking segment’s loan closing activity is for NVR’s homebuilding customers. NVR’s mortgage banking business generates revenues primarily from origination fees, gains on sales of loans, and title fees. A substantial portion of the Company’s mortgage operations is conducted in the Washington, D.C. and Baltimore, MD metropolitan areas. The following disclosure includes four homebuilding reportable segments that aggregate geographically the Company’s homebuilding operating segments, and the mortgage banking operations presented as a single 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. In addition, certain assets including goodwill and intangible assets, and consolidation adjustments as discussed further below, 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 charged to the operating segment upon the determination to terminate a Lot Purchase Agreement with the developer, or to restructure 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. Following are tables presenting segment revenues, profit before taxes, assets, interest income, interest expense, depreciation and amortization and expenditures for property and equipment, with reconciliations to the amounts reported for the consolidated enterprise, where applicable: Year Ended December 31, 2017 2016 2015 Revenues: Homebuilding Mid Atlantic $ 3,543,687 $ 3,319,776 $ 3,022,789 Homebuilding North East 517,141 462,385 432,145 Homebuilding Mid East 1,250,165 1,192,472 1,014,920 Homebuilding South East 864,528 734,590 595,346 Mortgage Banking 130,319 113,321 93,808 Consolidated revenues $ 6,305,840 $ 5,822,544 $ 5,159,008 Year Ended December 31, 2017 2016 2015 Profit before taxes: Homebuilding Mid Atlantic $ 398,494 $ 301,173 $ 322,829 Homebuilding North East 60,218 21,947 37,914 Homebuilding Mid East 149,639 121,166 86,336 Homebuilding South East 95,826 71,098 57,384 Mortgage Banking 73,959 63,711 51,236 Total segment profit 778,136 579,095 555,699 Reconciling items: Contract land deposit reserve adjustment (1) 1,307 10,933 13,805 Equity-based compensation expense (44,562 ) (43,598 ) (54,091 ) Corporate capital allocation (2) 198,384 189,992 171,170 Unallocated corporate overhead (89,514 ) (89,376 ) (83,124 ) Consolidation adjustments and other 26,143 35,204 22,622 Corporate interest expense (22,983 ) (20,553 ) (22,869 ) Reconciling items sub-total 68,775 82,602 47,513 Consolidated profit before taxes $ 846,911 $ 661,697 $ 603,212 As of December 31, 2017 2016 Assets: Homebuilding Mid Atlantic $ 1,079,225 $ 1,054,779 Homebuilding North East 143,008 126,720 Homebuilding Mid East 263,019 222,736 Homebuilding South East 277,705 214,225 Mortgage Banking 397,052 403,250 Total segment assets 2,160,009 2,021,710 Reconciling items: Cash and cash equivalents 645,087 375,748 Deferred taxes 111,953 170,652 Intangible assets and goodwill 50,144 51,526 Contract land deposit reserve (29,999 ) (31,306 ) Consolidation adjustments and other 52,085 55,613 Reconciling items sub-total 829,270 622,233 Consolidated assets $ 2,989,279 $ 2,643,943 Year Ended December 31, 2017 2016 2015 Interest income: Mortgage Banking $ 7,850 $ 7,569 $ 6,485 Total segment interest income 7,850 7,569 6,485 Other unallocated interest income 4,554 1,111 1,211 Consolidated interest income $ 12,404 $ 8,680 $ 7,696 Year Ended December 31, 2017 2016 2015 Interest expense: Homebuilding Mid Atlantic $ 123,075 $ 119,808 $ 107,748 Homebuilding North East 16,117 18,141 16,991 Homebuilding Mid East 29,663 28,307 27,263 Homebuilding South East 29,583 23,804 19,217 Mortgage Banking 1,148 1,086 641 Total segment interest expense 199,586 191,146 171,860 Corporate capital allocation (2) (198,384 ) (189,992 ) (171,170 ) Senior Notes and other interest 22,983 20,553 22,869 Consolidated interest expense $ 24,185 $ 21,707 $ 23,559 Year Ended December 31, 2017 2016 2015 Depreciation and amortization: Homebuilding Mid Atlantic $ 8,095 $ 8,089 $ 7,876 Homebuilding North East 2,034 2,053 1,571 Homebuilding Mid East 3,590 3,748 4,003 Homebuilding South East 2,531 2,276 2,191 Mortgage Banking 1,297 1,117 1,136 Total segment depreciation and amortization 17,547 17,283 16,777 Unallocated corporate 5,120 4,986 4,757 Consolidated depreciation and amortization $ 22,667 $ 22,269 $ 21,534 Year Ended December 31, 2017 2016 2015 Expenditures for property and equipment: Homebuilding Mid Atlantic $ 9,257 $ 8,838 $ 8,287 Homebuilding North East 1,299 3,423 2,220 Homebuilding Mid East 3,117 4,027 3,774 Homebuilding South East 3,313 3,594 1,753 Mortgage Banking 2,723 726 265 Total segment expenditures for property and equipment 19,709 20,608 16,299 Unallocated corporate 560 1,761 1,978 Consolidated expenditures for property and equipment $ 20,269 $ 22,369 $ 18,277 (1) This item represents changes to the contract land deposit impairment reserve, which are not allocated to the reportable segments. (2) 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 years presented: Year Ended December 31, 2017 2016 2015 Corporate capital allocation charge: Homebuilding Mid Atlantic $ 123,028 $ 119,758 $ 107,705 Homebuilding North East 16,115 18,132 16,987 Homebuilding Mid East 29,663 28,303 27,263 Homebuilding South East 29,578 23,799 19,215 Total corporate capital allocation charge $ 198,384 $ 189,992 $ 171,170

Variable Interest Entities

Variable Interest Entities	12 Months Ended
	Dec. 31, 2017
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure [Abstract]
Variable Interest Entities	Variable Interest Entities 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. In other words, if NVR does not perform under a Lot Purchase Agreement, NVR loses only its deposit. 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 variable interest entities (“VIE”). 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. Unless and until a development entity completes finished building lots through the development process to be able to sell, the process of which the development entity’s equity investors bear the full risk, 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 December 31, 2017 , NVR controlled approximately 84,300 lots under Lot Purchase Agreements with third parties through deposits in cash and letters of credit totaling approximately $393,900 and $1,900 , 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 and, in very limited circumstances, specific performance obligations. In addition, NVR has certain properties under contract with land owners that are expected to yield approximately 10,700 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 $6,600 and $100 , respectively, as of December 31, 2017 , of which approximately $5,800 is refundable if NVR does not perform under the contract. 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 December 31, 2017 and 2016 was as follows: December 31, 2017 2016 Contract land deposits $ 400,428 $ 411,150 Loss reserve on contract land deposits (29,999 ) (31,306 ) Contract land deposits, net 370,429 379,844 Contingent obligations in the form of letters of credit 1,996 2,379 Contingent specific performance obligations (1) 1,505 1,505 Total risk of loss $ 373,930 $ 383,728 (1) As of both December 31, 2017 and 2016 , the Company was committed to purchase 10 finished lots under specific performance obligations.

Joint Ventures

Joint Ventures	12 Months Ended
	Dec. 31, 2017
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 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 a standard Lot Purchase Agreement to purchase lots from these JVs, and as a result has a variable interest in these JVs. At December 31, 2017 , the Company had an aggregate investment totaling approximately $45,500 in six JVs that are expected to produce approximately 7,300 finished lots, of which approximately 3,900 lots were controlled by the Company and the remaining approximately 3,400 lots were either under contract with unrelated parties or not currently under contract. In addition, NVR had additional funding commitments in the aggregate totaling $5,300 to three of the JVs at December 31, 2017 . The Company has determined that it is not the primary beneficiary of five of the JVs because NVR and the other JV partner either share power or the other JV partner has the controlling financial interest. The aggregate investment in unconsolidated JVs was approximately $45,200 and $49,000 at December 31, 2017 and 2016 , respectively, and is reported in the “Other assets” line item on the accompanying 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 of the consolidated JV at December 31, 2017 and 2016 were as follows: December 31, 2017 2016 Assets: Cash $ 1,069 $ 1,214 Other assets 37 37 Total assets $ 1,106 $ 1,251 Liabilities and equity: Accrued expenses 487 550 Equity 619 701 Total liabilities and equity $ 1,106 $ 1,251 At December 31, 2016 , the Company had an aggregate investment totaling approximately $49,400 in six JVs that were expected to produce approximately 7,400 finished lots, of which approximately 4,200 lots were controlled by the Company and the remaining approximately 3,200 lots were either under contract with unrelated parties or not currently under contract. In addition, at December 31, 2016 , NVR had additional funding commitments in the aggregate totaling $6,200 to three of the JVs. The Company recognizes income from the JVs as a reduction to the lot cost of the lots purchased from the respective JVs when homes are settled and is based on expected total profitability and the total number of lots expected to be produced by the respective JVs. Distributions received from the unconsolidated JVs are allocated between return of capital and distributions of earnings based on the ratio of capital contributed by NVR to the total expected returns for the respective JVs, and are classified within the accompanying consolidated statements of cash flows as cash flows from investing activities and operating activities, respectively.

Land Under Development

Land Under Development	12 Months Ended
	Dec. 31, 2017
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. In October 2017, the Company purchased a raw land parcel for approximately $14,800 . The parcel is expected to produce approximately 150 lots. As of December 31, 2017 , NVR directly owned four separate raw parcels of land with a carrying value of $34,212 that it intends to develop into approximately 500 finished lots primarily for use in its homebuilding operations. 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 December 31, 2017 . As of December 31, 2016 , NVR directly owned four separate raw parcels of land with a carrying value of $46,999 , which were expected to produce approximately 600 finished lots.

Capitalized Interest

Capitalized Interest	12 Months Ended
	Dec. 31, 2017
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 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. NVR’s interest costs incurred, capitalized, expensed and charged to cost of sales during the years ended December 31, 2017 , 2016 and 2015 was as follows: December 31, 2017 2016 2015 Interest capitalized, beginning of year $ 5,106 $ 4,434 $ 4,072 Interest incurred 26,384 25,951 25,155 Interest charged to interest expense (24,185 ) (21,707 ) (23,559 ) Interest charged to cost of sales (1,722 ) (3,572 ) (1,234 ) Interest capitalized, end of year $ 5,583 $ 5,106 $ 4,434

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2017
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions During the year ended December 31, 2017 , NVR entered into Lot Purchase Agreements to purchase finished building lots for a total purchase price of approximately $66,600 with Elm Street Development, Inc. (“Elm Street”), which is controlled by one of the Company’s directors, William Moran. The independent members of the Company’s Board of Directors approved these transactions. During 2017 , 2016 and 2015 , NVR purchased developed lots at market prices from Elm Street for approximately $37,100 , $44,500 and $41,200 , respectively. The Company also continues to control a parcel of raw land expected to yield approximately 2,400 finished lots through a JV entered into with Elm Street during 2009. NVR and Elm Street each made an additional investment of $2,900 in the JV in 2017. NVR did not make any investments in the JV in 2016 . Further, during 2016 and 2015 , the Company paid Elm Street $143 per year to manage the development of a property that the Company purchased from Elm Street in 2010. No management fees were paid to Elm Street in 2017 related to this property.

Property, Plant and Equipment (

Property, Plant and Equipment ("PP&E")	12 Months Ended
	Dec. 31, 2017
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment ("PP&E")	Property, Plant and Equipment (“PP&E”) December 31, 2017 2016 Homebuilding: Office facilities and other $ 35,219 $ 33,352 Model home furniture and fixtures 33,901 34,924 Production facilities 61,348 58,068 Gross Homebuilding PP&E 130,468 126,344 Less: accumulated depreciation (87,277 ) (80,429 ) Net Homebuilding PP&E $ 43,191 $ 45,915 Mortgage Banking: Office facilities and other $ 14,069 $ 11,379 Less: accumulated depreciation (7,742 ) (6,476 ) Net Mortgage Banking PP&E $ 6,327 $ 4,903

Debt

Debt	12 Months Ended
	Dec. 31, 2017
Debt Disclosure [Abstract]
Debt	Debt Senior Notes On September 10, 2012 , NVR completed an offering for $600,000 of Senior Notes under a shelf registration statement filed on September 5, 2012 with the Securities and Exchange Commission (the “SEC”). The Senior Notes were issued at a discount to yield 3.97% and have been reflected net of the unamortized discount in the accompanying consolidated balance sheet. The offering of the Senior Notes resulted in aggregate net proceeds of approximately $593,900 , after deducting underwriting discounts and other offering expenses. 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 have been reflected net of unamortized debt issuance costs of $2,395 and $2,904 as of December 31, 2017 and 2016 , respectively. The Senior Notes are senior unsecured obligations and rank equally in right of payment with any of NVR’s existing and future unsecured senior indebtedness, will rank senior in right of payment to any of NVR’s future indebtedness that is by its terms expressly subordinated to the Senior Notes and will be effectively subordinated to any of NVR’s existing and future secured indebtedness to the extent of the value of the collateral securing such indebtedness. The indenture governing the Senior Notes has, among other items, and subject to certain exceptions, covenants that restrict the Company’s ability to create, incur, assume or guarantee secured debt, enter into sale and leaseback transactions and conditions related to mergers and/or the sale of assets. Credit Agreement On July 15, 2016, NVR entered into an unsecured Credit Agreement (the “Credit Agreement”) with Bank of America, N.A., as Administrative Agent, Swing Line Lender and L/C Issuer, Merrill Lynch, Pierce, Fenner & Smith Incorporated as Sole Lead Arranger and Sole Book Runner, and the other lenders party thereto, which provides for aggregate revolving loan commitments of $200,000 (the “Facility”). Proceeds of the borrowings under the Facility will be used for working capital and general corporate purposes. 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 $7,300 was outstanding at December 31, 2017 , and a $25,000 sublimit for a swing line commitment. Borrowings under the Credit Agreement generally bear interest for Base Rate Loans at a Base Rate equal to the highest of (i) a Federal Funds Rate plus one-half of one percent, (ii) Bank of America’s publicly announced “prime rate,” and (iii) the Eurodollar Rate plus one percent, plus the Applicable Rate which is based on the Company’s debt rating, or for Eurodollar Rate Loans, at the Eurodollar Rate equal to LIBOR plus the Applicable Rate. The Credit Agreement contains various representations and affirmative and negative covenants that are generally customary for credit facilities of this type. Such covenants include, among others, the following financial maintenance covenants: (i) minimum consolidated tangible net worth, (ii) minimum interest coverage ratio or minimum liquidity and (iii) a maximum leverage ratio. The negative covenants include, among others, certain limitations on liens, investments and fundamental changes. The Credit Agreement termination date is July 15, 2021 . The Company was in compliance with all covenants under the Credit Agreement at December 31, 2017 . There was no debt outstanding under the Facility at December 31, 2017 . Repurchase Agreement On July 26, 2017, NVRM entered into the Ninth Amendment (the “Amendment”) to its Amended and Restated Master Repurchase Agreement dated August 2, 2011 with U.S. Bank National Association (as amended by the Amendment and eight earlier amendments, the “Repurchase Agreement”). The purpose of the Repurchase Agreement is to finance the origination of mortgage loans by NVRM. The Repurchase Agreement provides for loan purchases up to $150,000 , subject to certain sub limits, and provides for an incremental commitment pursuant to which NVRM may from time to time request increases in the total commitment available under the Repurchase Agreement by up to $50,000 in the aggregate. Advances under the Repurchase Agreement carry a Pricing Rate based on the LIBOR Rate plus the LIBOR Margin, as determined under the Repurchase Agreement, provided that the Pricing Rate shall not be less than 2.125% . The Pricing Rate at December 31, 2017 was 3.75% . There are several restrictions on purchased loans, including that they cannot be sold to others, they cannot be pledged to anyone other than the agent, and they cannot support any other borrowing or repurchase agreement. Amounts outstanding under the Repurchase Agreement are collateralized by the Company’s mortgage loans held for sale. At December 31, 2017 , there were no borrowing base limitations reducing the amount available under the Repurchase Agreement. As of both December 31, 2017 and 2016 , there was no debt outstanding under the Repurchase Agreement. The Repurchase Agreement expires on July 25, 2018 . The Repurchase Agreement contains various affirmative and negative covenants. The negative covenants include, among others, certain limitations on transactions involving acquisitions, mergers, the incurrence of debt, sale of assets and creation of liens upon any of its Mortgage Notes. Additional covenants include (i) a tangible net worth requirement, (ii) a minimum liquidity requirement, (iii) a minimum net income requirement, and (iv) a maximum leverage ratio requirement. The Company was in compliance with all covenants under the Repurchase Agreement at December 31, 2017 .

Common Stock

Common Stock	12 Months Ended
	Dec. 31, 2017
Equity [Abstract]
Common Stock	Common Stock There were approximately 3,691 and 3,693 common shares outstanding at December 31, 2017 and 2016 , respectively. The Company made the following share repurchases during the years indicated: Year Ended December 31, 2017 2016 2015 Aggregate purchase price $ 422,166 $ 455,351 $ 431,367 Number of shares repurchased 167 280 290 The Company issues shares from the treasury account for all equity plan activity. The Company issued 165 , 83 and 131 such shares during 2017 , 2016 and 2015 , respectively.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes During 2017, the Company's provision for income taxes and effective tax rate were impacted by the following items: • The enactment of the Tax Cuts and Jobs Act in December 2017 required a remeasurement of the Company's net deferred tax assets and resulted in additional income tax expense of $62,702 . • The Company's January 1, 2017 adoption of ASU 2016-09 (see Note 1) resulted in the Company recognizing a current income tax benefit of $58,681 related to excess tax benefits from equity-based compensation in 2017. The provision for income taxes consists of the following: Year Ended December 31, 2017 2016 2015 Current: Federal $ 211,641 $ 209,454 $ 180,895 State 37,006 38,095 36,142 Deferred: Federal 60,785 (9,230 ) 2,681 State (42 ) (1,884 ) 567 $ 309,390 $ 236,435 $ 220,285 In addition to amounts applicable to income before taxes, the following income tax benefits were recorded in shareholders’ equity: Year Ended December 31, 2017 2016 2015 Income tax benefits arising from compensation expense for tax purposes in excess of amounts recognized for financial statement purposes (1) $ — $ 13,661 $ 23,311 (1) During 2017, these income tax benefits were recognized in the consolidated statement of income as required under ASU 2016-09. Deferred income taxes on NVR’s consolidated balance sheets were comprised of the following: December 31, 2017 2016 Deferred tax assets: Other accrued expenses and contract land deposit reserve $ 49,063 $ 76,498 Deferred compensation 4,743 7,075 Equity-based compensation expense 36,799 55,077 Inventory 9,393 13,514 Unrecognized tax benefit 14,351 23,954 Other 9,681 10,106 Total deferred tax assets 124,030 186,224 Less: Deferred tax liabilities 4,511 5,414 Net deferred tax asset $ 119,519 $ 180,810 Deferred tax assets arise principally as a result of various accruals required for financial reporting purposes and equity-based compensation expense, which are not currently deductible for tax return purposes. The decrease to the Company's deferred tax assets in 2017 was primarily attributable to the remeasurement as a result of the enactment of the Tax Cut and Jobs Act in December 2017. Management believes that the Company will have sufficient future taxable income to make it more likely than not that the net deferred tax assets will be realized. Federal taxable income is estimated to be approximately $614,562 for the year ended December 31, 2017 , and was $578,882 for the year ended December 31, 2016 . A reconciliation of income tax expense in the accompanying consolidated statements of income to the amount computed by applying the statutory federal income tax rate of 35% to income before taxes is as follows: Year Ended December 31, 2017 2016 2015 Income taxes computed at the federal statutory rate $ 296,419 $ 231,595 $ 211,124 State income taxes, net of federal income tax benefit (1) 30,046 23,738 23,919 Excess tax benefits from equity-based compensation (58,681 ) — — Remeasurement of net deferred tax assets due to enactment of Tax Cut and Jobs Act 62,702 — — Other, net (2) (21,096 ) (18,898 ) (14,758 ) $ 309,390 $ 236,435 $ 220,285 (1) Excludes state excess tax benefits from equity-based compensation included in the line below. (2) Primarily attributable to tax benefits from the domestic production activities deduction. The Company’s effective tax rate in 2017 , 2016 and 2015 was 36.53% , 35.73% and 36.52% , respectively. As previously discussed, the 2017 effective tax rate was impacted by the enactment of the Tax Cut and Jobs Act and the Company's adoption of ASU 2016-09. The Company files a consolidated U.S. federal income tax return, as well as state and local tax returns in all jurisdictions where the Company maintains operations. With few exceptions, the Company is no longer subject to income tax examinations by tax authorities for years prior to 2014 . A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows: Year Ended December 31, 2017 2016 Balance at beginning of year $ 46,110 $ 46,591 Additions based on tax positions related to the current year 4,793 4,440 Reductions for tax positions of prior years (5,566 ) (4,921 ) Settlements — — Balance at end of year $ 45,337 $ 46,110 If recognized, the total amount of unrecognized tax benefits that would affect the effective tax rate (net of the federal tax benefit) is $35,816 as of December 31, 2017 . The Company recognizes interest related to unrecognized tax benefits as a component of income tax expense. For the years ended December 31, 2017 and 2016 , the Company recognized a net reversal of accrued interest on unrecognized tax benefits in the amount of $1,065 and $1,582 , respectively. For the year ended December 31, 2015 , the Company recognized a net addition of accrued interest on unrecognized tax benefits in the amount of $125 . As of December 31, 2017 and 2016 , the Company had a total of $18,575 and $19,639 , respectively, of accrued interest on unrecognized tax benefits which are included in “Accrued expenses and other liabilities” on the accompanying consolidated balance sheets. Based on its historical experience in dealing with various taxing authorities, the Company has found that it is the administrative practice of these authorities to not seek penalties from the Company for the tax positions it has taken on its returns, related to its unrecognized tax benefits. Therefore, the Company does not accrue penalties for the positions in which it has an unrecognized tax benefit. However, if such penalties were to be accrued, they would be recorded as a component of income tax expense. The Company believes that within the next 12 months, it is reasonably possible that the unrecognized tax benefits as of December 31, 2017 will be reduced by approximately $11,971 due to statute expiration and effectively settled positions in various state jurisdictions. The Company is currently under audit by the states of New Jersey and North Carolina.

Equity-Based Compensation, Prof

Equity-Based Compensation, Profit Sharing and Deferred Compensation Plans	12 Months Ended
	Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Equity-Based Compensation, Profit Sharing and Deferred Compensation Plans	Equity-Based Compensation, Profit Sharing and Deferred Compensation Plans Equity-Based Compensation Plans NVR’s equity-based compensation plans provide for the granting of non-qualified stock options to purchase shares of NVR common stock (“Options”) and restricted share units (“RSUs”) to key management employees, including executive officers and Board members, of the Company. The exercise price of Options granted is equal to the closing price of the Company’s common stock on the New York Stock Exchange (the “NYSE”) on the day prior to the date of grant, and RSUs are issued at a $0 exercise price. Options are granted for a ten -year term and typically vest in separate tranches over periods of 3 to 6 years. The vesting for certain Options is contingent solely on continued employment or service as a Director, while vesting for other Options is contingent upon both continued employment or service as a Director and the achievement of a performance metric as discussed further in the summary description of the 2014 Equity Incentive Plan below. RSUs generally vest in separate tranches over periods of 2 to 4 years, based solely on continued employment or continued service as a Director. The following table provides a summary of each of the Company’s equity-based compensation plans for any plan with grants outstanding at December 31, 2017 : Equity-Based Compensation Plans Shares Authorized Options/RSUs Outstanding Shares Available to Issue 1998 Management Long-Term Stock Option Plan 1,000 6 — 2000 Broadly-Based Stock Option Plan 2,000 89 — 2010 Equity Incentive Plan (1) 700 218 38 2014 Equity Incentive Plan (2) 950 613 276 (1) During 2010, the Company’s shareholders approved the 2010 Equity Incentive Plan (the “2010 Plan”). The 2010 Plan authorizes the Company to issue Options and RSUs to key management employees, including executive officers and Board members. Of the 700 aggregate shares available to issue, up to 240 may be granted in the form of RSUs. There were 208 Options and 10 RSUs outstanding as of December 31, 2017 . Of the 38 shares available to be issued under the 2010 Plan, substantially all may be granted as RSUs. (2) During 2014, the Company’s shareholders approved the 2014 Equity Incentive Plan (the “2014 Plan”). The 2014 Plan authorizes the Company to issue Options to key management employees, including executive officers and Board members. Option grants under the 2014 Plan are generally divided such that vesting for 50% of the Option grant is solely contingent upon continued employment or continued service as a Director, while vesting for the remaining 50% of the Option grant is contingent upon both continued employment or service as a Director and the achievement of a performance metric. The performance metric is based on the Company’s return on capital performance relative to a peer group during a specified three year period based on the date of Option grant, with the initial performance period being 2014 through 2016. Based on the Company's return on capital performance, the initial performance period metric was met. Future vesting of Option grants subject to the initial performance period are subject only to continued employment or continued service as a director. Options granted under the 2014 Plan vest annually over four years in 25% increments beginning on December 31, 2016, or later based on the date of grant. During 2017 , the Company issued 19 Options under the 2014 Plan. Substantially all of the Options granted in 2017 will vest annually over four years in 25% increments beginning on December 31, 2019. Vesting for 15 of the Options granted is contingent both upon continued employment or continued service as a director and the Company’s return on capital performance. Vesting for the other 4 Options granted under the 2014 Plan is contingent solely upon continued employment or continued service as a director. The Company also issued 11 Options under the 2010 Plan during 2017 . Substantially all of the 2010 Plan Options granted during 2017 will vest annually over four years in 25% increments beginning on December 31, 2019. The vesting for the Options granted under the 2010 Plan is based solely on continued employment. The following table provides additional information relative to NVR’s equity-based compensation plans for the year ended December 31, 2017 : Shares Weighted Avg. Per Share Exercise Price Weighted Avg. Remaining Contract Life (years) Aggregate Intrinsic Value Stock Options Outstanding at December 31, 2016 1,076 $ 1,048.38 Granted 30 2,431.54 Exercised (159 ) 886.41 Forfeited (31 ) 1,099.68 Outstanding at December 31, 2017 916 $ 1,119.92 6.0 $ 2,187,430 Exercisable at December 31, 2017 461 $ 957.50 5.0 $ 1,176,843 RSUs Outstanding at December 31, 2016 16 Granted — Vested (6 ) Forfeited — Outstanding at December 31, 2017 10 $ 34,945 Vested, but not issued at December 31, 2017 5 $ 18,344 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 2017 , 2016 and 2015 was estimated on the grant date using the Pricing Model, based on the following assumptions: 2017 2016 2015 Estimated option life (years) 5.26 5.27 5.17 Risk free interest rate (range) 1.53%-2.38% 0.86%-2.21% 1.04%-2.07% Expected volatility (range) 15.09%-17.95% 15.91%-23.49% 17.00%-26.79% Expected dividend rate — % — % — % Weighted average grant-date fair value per share of options granted $ 494.17 $ 320.21 $ 296.50 In accordance with ASC 718, Compensation – Stock Compensation , the fair value of the RSUs is measured as if they were vested and issued on the grant date. Additionally, under ASC 718, service-only restrictions on vesting of RSUs are not reflected in the fair value calculation at the grant date. As a result, the fair value of the RSUs was the closing price of the Company’s common stock on the day immediately preceding the date of grant. There were no RSUs granted during 2017 . 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 RSUs are treated as a separate award from the Options. Additionally, the Options which are subject to a performance condition are treated as a separate award from the “service-only” Options, and compensation expense is recognized when it becomes probable that the stated performance target will be achieved. The Company currently believes that it is probable that the current open performance condition will be satisfied at the target level and is recognizing compensation expense related to such Options accordingly. Compensation cost is recognized within the income statement in the same expense line as the cash compensation paid to the respective employees. In connection with the adoption of ASU 2016-09 on January 1, 2017, the Company made the election to recognize forfeitures of equity-based awards as a reduction to compensation costs in the period in which they occur. For the years ended December 31, 2016 and 2015, the Company estimated forfeitures based on its historical forfeiture rate. In 2017 , 2016 and 2015 , the Company recognized $44,562 , $43,598 , and $54,091 in equity-based compensation costs, respectively, and approximately $17,100 , $17,000 , and $19,700 in tax benefit related to equity-based compensation costs, respectively. As of December 31, 2017 , the total unrecognized compensation cost for all outstanding Options and RSUs equaled approximately $100,000 . The unrecognized compensation cost will be recognized over each grant’s applicable vesting period with the latest vesting date being December 31, 2023. The weighted-average period over which the unrecognized compensation will be recorded is equal to approximately 1.9 years. The Company settles Option exercises and vesting of RSUs by issuing shares of treasury stock. Shares are relieved from the treasury account based on the weighted average cost of treasury shares acquired. During the years ended December 31, 2017 , 2016 and 2015 , the Company issued 165 , 83 and 131 shares, respectively, from the treasury account for Option exercises and vesting of RSUs. Information with respect to the vested RSUs and exercised Options is as follows: Year Ended December 31, 2017 2016 2015 Aggregate exercise proceeds (1) $ 140,525 $ 38,106 $ 85,948 Aggregate intrinsic value on exercise dates $ 206,890 $ 96,600 $ 99,288 (1) Aggregate exercise proceeds include the Option exercise price received in cash or the fair market value of NVR stock surrendered by the optionee in lieu of cash. Profit Sharing Plans NVR has a trustee-administered, profit sharing retirement plan (the “Profit Sharing Plan”) and an Employee Stock Ownership Plan (“ESOP”) covering substantially all employees. The Profit Sharing Plan and the ESOP provide for annual discretionary contributions in amounts as determined by the NVR Board of Directors. The combined plan contribution for the years ended December 31, 2017 , 2016 and 2015 was approximately $18,400 , $16,700 and $17,900 , respectively. The ESOP purchased approximately 6 and 9 shares of NVR common stock in the open market for the 2017 and 2016 plan year contributions, respectively, using cash contributions provided by the Company. As of December 31, 2017 , all shares held by the ESOP had been allocated to participants’ accounts. The 2017 plan year contribution was funded and fully allocated to participants in February 2018 . Deferred Compensation Plans The Company has two deferred compensation plans (“Deferred Comp Plans”). The specific purpose of the Deferred Comp Plans is to i) establish a vehicle whereby named executive officers may defer the receipt of salary and bonus that otherwise would be nondeductible for Company tax purposes into a period where the Company would realize a tax deduction for the amounts paid, and ii) to enable certain employees who are subject to the Company’s stock holding requirements to acquire shares of the Company’s common stock on a pre-tax basis in order to more quickly meet, and maintain compliance with those stock holding requirements. Amounts deferred into the Deferred Comp Plans are invested in NVR common stock, held in a rabbi trust account, and are paid out in a fixed number of shares upon expiration of the deferral period. The rabbi trust account held 109 shares of NVR common stock as of both December 31, 2017 and 2016 . Shares held by the Deferred Comp Plans are treated as outstanding shares in the Company’s earnings per share calculation for each of the years ended December 31, 2017 , 2016 and 2015 .

Commitments and Contingent Liab

Commitments and Contingent Liabilities	12 Months Ended
	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingent Liabilities	Commitments and Contingent Liabilities NVR is committed under multiple non-cancelable operating leases involving office space, model homes, production facilities, automobiles and equipment. Future minimum lease payments under these operating leases as of December 31, 2017 are as follows: Year Ending December 31, 2018 $ 29,366 2019 21,569 2020 17,799 2021 13,436 2022 10,780 Thereafter 17,202 110,152 Sublease income (30 ) $ 110,122 Total rent expense incurred under operating leases was approximately $49,400 , $45,800 and $48,100 for the years ended December 31, 2017 , 2016 and 2015 , respectively. The Company 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 the Company fails to perform under the agreement. 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. At December 31, 2017 , assuming that contractual development milestones are met and the Company exercises its option, the Company expects to place additional forfeitable deposits with land developers under existing Lot Purchase Agreements of approximately $137,900 . The Company also has one specific performance contract pursuant to which the Company is committed to purchase 10 finished lots at an aggregate purchase price of approximately $1,505 . Additionally, as of December 31, 2017 , we had funding commitments totaling approximately $7,900 under a joint development agreement related to our land under development, a portion of which we expect will be offset by development credits of approximately $4,700 . During the ordinary course of operating the homebuilding and mortgage banking businesses, the Company is required to enter into bond or letter of credit arrangements with local municipalities, government agencies, or land developers to collateralize its obligations under various contracts. The Company had approximately $44,300 of contingent obligations under such agreements, including approximately $7,300 for letters of credit issued under the Credit Agreement as of December 31, 2017 . The Company believes it will fulfill its obligations under the related contracts and does not anticipate any material losses under these bonds or letters of credit. The following table reflects the changes in the Company’s warranty reserve (see Note 1 herein for further discussion of warranty/product liability reserves): Year Ended December 31, 2017 2016 2015 Warranty reserve, beginning of year $ 93,895 $ 87,407 $ 94,060 Provision 44,652 50,787 47,003 Payments (44,034 ) (44,299 ) (53,656 ) Warranty reserve, end of year $ 94,513 $ 93,895 $ 87,407 The Company and its subsidiaries are also involved in various other 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.

Fair Value

Fair Value	12 Months Ended
	Dec. 31, 2017
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 December 31, 2017 and 2016 were $630,000 and $612,000 , 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 December 31, 2017 and 2016 were $597,066 and $596,455 , 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 consists primarily of cash equivalents, due to their short term nature. Derivative Instruments and Mortgage Loans Held for Sale In the normal course of business, NVRM, enters into contractual commitments to extend credit to buyers of single-family homes 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 sales 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 December 31, 2017 , there were contractual commitments to extend credit to borrowers aggregating $490,184 and open forward delivery contracts aggregating $705,405 , which hedge both the rate lock loan commitments and closed loans held for sale. The fair value of the Company’s rate lock commitments to borrowers and the related input levels includes, 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. As of December 31, 2017, the fair value of loans held for sale of $352,489 included on the accompanying consolidated balance sheet has been increased by $1,931 from the aggregate principal balance of $350,558 . As of December 31, 2016, the fair value of loans held for sale of $351,958 were decreased by $5,954 from the aggregate principal balance of $357,912 . The fair value measurement of NVRM's undesignated derivative instruments was as follows: As of December 31, 2017 2016 Rate lock commitments: Gross assets $ 5,400 $ 5,403 Gross liabilities 1,832 3,327 Net rate lock commitments $ 3,568 $ 2,076 Forward sales contracts: Gross assets $ 992 $ 9,148 Gross liabilities 667 1,084 Net forward sales contracts $ 325 $ 8,064 The net rate lock commitments and net forward sales contracts are both reported in mortgage banking "Other assets" on the accompanying consolidated balance sheets. The fair value measurement as of December 31, 2017 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 $ 490,184 $ (666 ) $ (407 ) $ 4,641 $ — $ 3,568 Forward sales contracts $ 705,405 — — — 325 325 Mortgages held for sale $ 350,558 (204 ) (1,726 ) 3,861 — 1,931 Total fair value measurement $ (870 ) $ (2,133 ) $ 8,502 $ 325 $ 5,824 The total fair value measurement as of December 31, 2016 was $4,186 . For the year ended December 31, 2017 , NVRM recorded a fair value adjustment to income of $1,638 . For the year ended December 31, 2016 , NVRM recorded a fair value adjustment to expense of $3,147 . For the year ended December 31, 2015, NVRM recorded a fair value adjustment to income of $3,508 . 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 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.

Mortgage Repurchase Reserve

Mortgage Repurchase Reserve	12 Months Ended
	Dec. 31, 2017
Mortgage Repurchase Reserve [Abstract]
Mortgage Repurchase Reserve	Mortgage Repurchase Reserve During the years ended December 31, 2017 , 2016 and 2015 , the Company recognized pre-tax charges for loan losses related to mortgage loans sold of approximately $2,900 , $2,000 and $2,700 , respectively. Included in the Mortgage Banking segment’s “Accounts payable and other liabilities” line item on the accompanying consolidated balance sheets is a mortgage repurchase reserve equal to approximately $14,000 and $12,700 at December 31, 2017 and 2016 , respectively.

Quarterly Results (unaudited)

Quarterly Results (unaudited)	12 Months Ended
	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Quarterly Results (unaudited)	Quarterly Results (unaudited) The following table sets forth unaudited selected financial data and operating information on a quarterly basis for the years ended December 31, 2017 and 2016 . Year Ended December 31, 2017 4th Quarter 3rd Quarter 2nd Quarter 1st Quarter Revenues – homebuilding operations $ 1,781,494 $ 1,633,726 $ 1,512,714 $ 1,247,587 Gross profit – homebuilding operations $ 343,187 $ 325,755 $ 294,631 $ 221,570 Mortgage banking fees $ 34,842 $ 34,194 $ 31,778 $ 29,505 Net income $ 124,619 $ 162,102 $ 147,877 $ 102,923 Diluted earnings per share $ 28.88 $ 38.02 $ 35.19 $ 25.12 New orders (units) 4,306 4,200 4,678 4,424 Settlements (units) 4,630 4,158 3,917 3,256 Backlog, end of period (units) 8,531 8,855 8,813 8,052 Loans closed $ 1,229,695 $ 1,115,494 $ 1,041,613 $ 843,341 Year Ended December 31, 2016 4th Quarter 3rd Quarter 2nd Quarter 1st Quarter Revenues – homebuilding operations $ 1,718,527 $ 1,507,451 $ 1,361,741 $ 1,121,504 Gross profit – homebuilding operations $ 305,087 $ 265,159 $ 235,372 $ 195,744 Mortgage banking fees $ 34,239 $ 30,118 $ 26,442 $ 22,522 Net income $ 150,891 $ 117,392 $ 91,676 $ 65,303 Diluted earnings per share $ 37.80 $ 28.46 $ 22.01 $ 15.79 New orders (units) 3,645 3,477 4,324 4,137 Settlements (units) 4,419 3,922 3,581 3,006 Backlog, end of period (units) 6,884 7,658 8,103 7,360 Loans closed $ 1,201,164 $ 1,055,163 $ 942,407 $ 753,840

Summary of Significant Accoun23

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Principles of Consolidation	Principles of Consolidation The accompanying consolidated financial statements include the accounts of NVR, Inc. and its subsidiaries (“NVR” or the “Company”) and certain other entities in which the Company is deemed to be the primary beneficiary (see Notes 3 and 4 herein for additional information). All significant intercompany transactions have been eliminated in consolidation.
Use of Estimates in the Preparation of Financial Statements	Use of Estimates in the Preparation of Financial Statements The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America (“GAAP”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting periods. Management continually evaluates the estimates used to prepare the consolidated financial statements and updates those estimates as necessary. In general, the Company’s estimates are based on historical experience, on information from third party professionals, and other various assumptions that are believed to be reasonable under the facts and circumstances. Actual results could differ materially from those estimates made by management.
Cash and Cash Equivalents	Cash and Cash Equivalents 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.
Homebuilding Inventory	Homebuilding Inventory The carrying value of inventory is stated at the lower of cost or market value. Cost of lots and completed and uncompleted housing units represent the accumulated actual cost of the units. Field construction supervisors’ salaries and related direct overhead expenses are included in inventory costs. Interest costs are not capitalized into inventory, with the exception of land under development and joint venture investments, as applicable (see below). Upon settlement, the cost of the unit is expensed on a specific identification basis. Cost of building materials is determined on a first-in, first-out basis. Sold inventory is evaluated for impairment based on the contractual sales price compared to the total estimated cost to construct. Unsold inventory is evaluated for impairment by analyzing recent comparable sales prices within the applicable community compared to the costs incurred to date plus the expected costs to complete. Any calculated impairments are recorded immediately.
Contract Land Deposits	Contract Land Deposits The Company purchases finished lots under fixed price lot purchase agreements (“Lot Purchase Agreements”) that require deposits that may be forfeited if NVR fails to perform under the contract. The deposits are in the form of cash or letters of credit in varying amounts and represent a percentage of the aggregate purchase price of the finished lots. NVR maintains an allowance for losses on contract land deposits that reflects the Company’s judgment of the present loss exposure in the existing contract land deposit portfolio at the end of the reporting period. To analyze contract land deposit impairments, NVR utilizes guidance from Accounting Standards Codification (“ASC”) 450, Contingencies , and conducts a loss contingency analysis each quarter. In addition to considering market and economic conditions, NVR assesses contract land deposit impairments on a community-by-community basis pursuant to the purchase contract terms, analyzing, as applicable, current sales absorption levels, recent sales’ direct profit, the dollar differential between the contractual purchase price and the current market price for lots, a developer’s financial stability, a developer’s financial ability or willingness to reduce lot prices to current market prices, and the contract’s default status by either the Company or the developer along with an analysis of the expected outcome of any such default. NVR’s analysis is focused on whether the Company can sell houses at an acceptable margin and sales pace in a particular community in the current market with which the Company is faced. Because the Company does not own the finished lots on which the Company has placed a contract land deposit, if the above analysis leads to a determination that the Company cannot sell homes at an acceptable margin and sales pace at the current contractual lot price, the Company then determines whether it will elect to default under the contract, forfeit the deposit and terminate the contract, or whether the Company will attempt to restructure the lot purchase contract, which may require it to forfeit the deposit to obtain contract concessions from a developer. The Company also assesses whether impairment is present due to collectability issues resulting from a developer’s non-performance because of financial or other conditions.
Land Under Development	Land Under Development On a limited basis, NVR directly acquires raw parcels of land 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. Land under development, including the land under development held by the Company’s unconsolidated joint ventures and the related joint venture investments, is reviewed for potential write-downs when impairment indicators are present. In addition to considering market and economic conditions, the Company assesses land under development impairments on a community-by-community basis, analyzing, as applicable, current sales absorption levels, recent sales’ direct profit, and the dollar differential between the projected fully-developed cost of the lots and the current market price for lots. If indicators of impairment are present for a community, NVR performs an analysis to determine if the undiscounted cash flows estimated to be generated by those assets are less than their carrying amounts, and if so, impairment charges are required to be recorded if the fair value of such assets is less than their carrying amounts. For those assets deemed to be impaired, the impairment to be recognized is measured as the amount by which the carrying amount of the assets exceeds the fair value of the assets. The Company’s determination of fair value is primarily based on discounting the estimated future cash flows at a rate commensurate with the inherent risks associated with the assets and related estimated cash flow streams. NVR does not believe that any of the land under development is impaired as of December 31, 2017.
Property, Plant, and Equipment	Property, Plant, and Equipment Property, plant, and equipment are carried at cost less accumulated depreciation and amortization. Depreciation is based on the estimated useful lives of the assets using the straight-line method. Model home furniture and fixtures are generally depreciated over a two -year period, office facilities and other equipment are depreciated over a period of three to ten years and production facilities are depreciated over periods of five to forty years.
Intangible Assets	Intangible Assets On December 31, 2012, the Company acquired substantially all of the assets of Heartland Homes, Inc., which resulted in the Company recording finite-lived intangible assets and goodwill. The Company completed its annual assessment for impairment of goodwill and management determined that there was no impairment. As of December 31, 2017 and 2016 , finite-lived intangible assets, net of accumulated amortization, totaled $776 and $2,158 , respectively. The remaining finite-lived intangible assets will be amortized on a straight-line basis over 5 years. As of both December 31, 2017 and 2016 , the goodwill value was $441 . Finite-lived intangible assets and goodwill are included in homebuilding "Other assets" in the accompanying consolidated balance sheets.
Warranty/Product Liability Reserves	Warranty/Product Liability Reserves The Company establishes warranty and product liability reserves 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 likely 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.
Mortgage Loans Held for Sale, Derivatives and Hedging Activities	Mortgage Loans Held for Sale, Derivatives and Hedging Activities NVR originates several different loan products to its customers to finance the purchase of a home through its wholly-owned mortgage subsidiary, NVR Mortgage Finance, Inc. (“NVRM”). NVRM sells all of the loans it originates into the secondary market on a servicing released basis, typically within 30 days from origination. All of the loans that NVRM originates are underwritten to the standards and specifications of the ultimate investor. Those underwriting standards are typically equal to or more stringent than the underwriting standards required by Fannie Mae (“FNMA”), Freddie Mac ("FHLMC"), the Department of Veterans Affairs (“VA”) and the Federal Housing Administration (“FHA”). Insofar as NVRM underwrites its originated loans to those standards, NVRM bears no increased concentration of credit risk from the issuance of loans, except in certain limited instances where early payment default occurs. NVRM employs a quality control department to ensure that its underwriting controls are effectively operating, and further assesses the underwriting function as part of its assessment of internal controls over financial reporting. NVRM maintains a reserve for losses on mortgage loans originated that reflects NVR’s judgment of the present loss exposure in the loans that NVRM has originated and sold. The reserve is calculated based on an analysis of historical experience and exposure (see Note 15 herein for further information). Mortgage loans held for sale are carried at the lower of cost or fair value, net of deferred origination costs, until sold. In the normal course of business, NVRM enters into contractual commitments to extend credit to buyers of single-family homes 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 sale 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 December 31, 2017 , there were contractual commitments to extend credit to borrowers aggregating $490,184 , and open forward delivery sale contracts aggregating $705,405 , which hedge both the rate lock loan commitments and closed loans held for sale (see Note 14 herein for a description of the Company’s fair value accounting).
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 years ended December 31, 2017 , 2016 and 2015 : Year Ended December 31, 2017 2016 2015 Weighted average number of shares outstanding used to calculate basic EPS 3,733 3,847 4,022 Dilutive securities: Stock options and restricted share units 507 257 233 Weighted average number of shares and share equivalents outstanding used to calculate diluted EPS 4,240 4,104 4,255 The assumed proceeds used in the treasury method for calculating NVR’s diluted earnings per share includes the amount the employee must pay upon exercise and the amount of compensation cost attributed to future services not yet recognized. The following stock options issued under equity incentive plans were outstanding during the years ended December 31, 2017 , 2016 and 2015 , but were not included in the computation of diluted earnings per share because the effect would have been anti-dilutive. Year Ended December 31, 2017 2016 2015 Anti-dilutive securities 15 87 50
Revenues-Homebuilding Operations	Revenues – Homebuilding Operations NVR builds single-family detached homes, townhomes and condominium buildings, which generally are constructed on a pre-sold basis for the ultimate customer. Revenues are recognized at the time the unit is settled and title passes to the customer, adequate cash payment has been received and there is no continuing involvement. In situations where the buyer’s financing is originated by NVRM and the buyer has not made an adequate initial or continuing investment as prescribed by GAAP, the profit on such settlement is deferred until the sale of the related loan to a third-party investor has been completed.
Mortgage Banking Fees	Mortgage Banking Fees Mortgage banking fees include income earned by NVRM for originating mortgage loans, servicing mortgage loans held on an interim basis, title fees, gains and losses on the sale of mortgage loans and mortgage servicing and other activities incidental to mortgage banking. Mortgage banking fees are generally recognized after the loan has been sold to an unaffiliated, third party investor.
Income Taxes	Income Taxes Income taxes are accounted for under the asset and liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax basis. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on the deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. See Note 11 herein for discussion of the impact on the Company's deferred tax asset resulting from the enactment of the Tax Cuts and Jobs Act in December 2017. ASC 740-10, Income Taxes , provides that a tax benefit from an uncertain tax position may be recognized when it is more-likely-than-not (defined as a likelihood of more than 50%) that the position will be sustained upon examination, including resolution of any related appeals or litigation processes, based on the technical merits. If a tax position does not meet the more-likely-than-not recognition threshold, despite the Company’s belief that its filing position is supportable, the benefit of that tax position is not recognized in the statements of income. The Company recognizes interest related to unrecognized tax benefits as a component of income tax expense. Based on its historical experience in dealing with various taxing authorities, the Company has found that it is the administrative practice of the taxing authorities to not seek penalties from the Company for the tax positions it has taken on its returns, related to its unrecognized tax benefits. Therefore, the Company does not accrue penalties for the positions in which it has an unrecognized tax benefit. However, if such penalties were to be accrued, they would be recorded as a component of income tax expense. The Company recognizes unrecognized tax benefits in the period that the uncertainty is eliminated by either affirmative agreement of the uncertain tax position by the applicable taxing authority, by expiration of the applicable statute of limitation, or by determination in accordance with certain states’ administrative practices that the uncertain tax position has been effectively settled (see Note 11 herein for further information).
Financial Instruments	Financial Instruments Except as otherwise noted herein, NVR believes that insignificant differences exist between the carrying value and the fair value of its financial instruments (see Note 14 herein for further information).
Equity-Based Compensation	Equity-Based Compensation The Company accounts for its equity-based compensation in accordance with ASC 718, Compensation – Stock Compensation. ASC 718 requires an entity to recognize an expense within its income statement for all share-based payment arrangements, which includes employee stock option and restricted share unit plans. The expense is based on the grant-date fair value of the stock options and restricted share units granted, and is recognized ratably over the requisite service period. Recognition of compensation expense for the stock options which are subject to a performance condition are treated as a separate award from the “service-only” stock options, and expense is recognized when it becomes probable that the stated performance target will be achieved. The Company calculates the fair value of its non-publicly traded, employee stock options using the Black-Scholes option-pricing model. The grant date fair value of the restricted share units is the closing price of the Company’s common stock on the day immediately preceding the date of grant. The Company’s equity-based compensation programs are accounted for as equity-classified awards (see Note 12 herein for further discussion of equity-based compensation plans).
Comprehensive Income	Comprehensive Income For the years ended December 31, 2017 , 2016 and 2015 , comprehensive income equaled net income; therefore, a separate statement of comprehensive income is not included in the accompanying consolidated financial statements.
Reclassifications	Reclassifications Certain prior period amounts have been reclassified to conform to the current year's presentation.
Recent Accounting Pronouncements	Recent Accounting Pronouncements Recently Adopted Accounting Pronouncements T he Company adopted Accounting Standards Update (“ASU”) 2016-09, Compensation – Stock Compensation: Improvements to Employee Share-Based Payment Accounting, effective January 1, 2017. In connection with the adoption of ASU 2016-09, the Company: • Recorded the excess tax benefit from stock option exercises as a reduction to income tax expense prospectively beginning January 1, 2017. In 2016 and 2015, the excess tax benefit was recorded to additional paid-in capital within shareholders’ equity. The excess tax benefit recognized during 2017, 2016 and 2015 was $58,681 , $13,661 and $23,311 , respectively. • Presented the aforementioned excess tax benefit recognized as an operating activity on the statement of cash flows and retrospectively adjusted the prior year Statement of Cash Flows accordingly. In the prior years, the excess tax benefit was recognized as a cash inflow from financing activities and a corresponding cash outflow from operating activities. The retrospective adjustment to the prior year Statement of Cash Flows resulted in increases of $13,661 and $23,311 to net cash provided by operating activities in 2016 and 2015, respectively, and increases of $13,661 and $23,311 to net cash used in financing activities in 2016 and 2015, respectively. • Made the election to recognize forfeitures of equity-based awards in the period in which they occur. This election was applied using the modified retrospective transition method, which resulted in the Company recording a cumulative-effect adjustment, net of tax, to reduce beginning retained earnings as of January 1, 2017 by $957 . In prior years, the Company estimated forfeitures based on its historical forfeiture rate. No other adjustments were made as a result of the adoption of ASU 2016-09. The Company also adopted ASU 2015-11, Inventory – Simplifying the Measurement of Inventory effective January 1, 2017. The standard requires inventory to be measured at the lower of cost or net realizable value. Under prior GAAP, impaired inventory was written down to net realizable value less a normal profit margin. Under the new standard, impaired inventory is written down to the net realizable value. ASU 2015-11 was adopted prospectively and did not have a material effect on the Company’s consolidated financial statements. Recently Issued Accounting Pronouncements In May 2014, FASB issued ASU 2014-09, Revenue from Contracts with Customers , which requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. The standard is effective for the Company as of January 1, 2018 and replaces most existing revenue recognition guidance in GAAP. The Company will adopt the standard using the cumulative effect transition method. The Company has determined that the adoption of this standard will not have a material effect on its consolidated financial statements and related disclosures. In February 2016, 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. The Company believes that the adoption of this standard will have a material effect on both assets and liabilities presented on the balance sheet, and is further evaluating the impact of its adoption. In June 2016, 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 is currently evaluating the effect that the standard will have on its consolidated financial statements and related disclosures. In August 2016, FASB issued ASU 2016-15, Classification of Certain Cash Receipts and Cash Payments . The objective of the standard is to address the diversity in practice of how certain cash receipts and payments are presented on the statement of cash flows. The standard requires that the guidance be applied retrospectively in the first interim and annual periods in which an entity adopts the guidance. The standard is effective for the Company as of January 1, 2018. The Company expects the standard to affect the presentation of distributions from joint ventures on its consolidated statements of cash flows. In November 2016, FASB issued ASU 2016-18, Statement of Cash Flows (Topic 230), Restricted Cash . 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, restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total cash amounts shown on the statement of cash flows. The standard is effective for the Company as of January 1, 2018. The Company does not believe that the adoption of this standard will have a material effect on its consolidated statements of cash flows and related disclosures. In January 2017, 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. In May 2017, FASB issued ASU 2017-09, Compensation – Stock Compensation (Topic 718), Scope of Modification Accounting. 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 standard is effective for the Company on January 1, 2018. The Company does not believe that the adoption of this standard will have a material effect on its consolidated financial statements and related disclosures.

Summary of Significant Accoun24

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2017
Accounting Policies [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 years ended December 31, 2017 , 2016 and 2015 : Year Ended December 31, 2017 2016 2015 Weighted average number of shares outstanding used to calculate basic EPS 3,733 3,847 4,022 Dilutive securities: Stock options and restricted share units 507 257 233 Weighted average number of shares and share equivalents outstanding used to calculate diluted EPS 4,240 4,104 4,255
Summary of Antidilutive Securities Excluded from Computation of Earnings Per Share	The following stock options issued under equity incentive plans were outstanding during the years ended December 31, 2017 , 2016 and 2015 , but were not included in the computation of diluted earnings per share because the effect would have been anti-dilutive. Year Ended December 31, 2017 2016 2015 Anti-dilutive securities 15 87 50

Segment Information, Nature o25

Segment Information, Nature of Operations, and Certain Concentrations (Tables)	12 Months Ended
	Dec. 31, 2017
Segment Reporting [Abstract]
Revenues	Following are tables presenting segment revenues, profit before taxes, assets, interest income, interest expense, depreciation and amortization and expenditures for property and equipment, with reconciliations to the amounts reported for the consolidated enterprise, where applicable: Year Ended December 31, 2017 2016 2015 Revenues: Homebuilding Mid Atlantic $ 3,543,687 $ 3,319,776 $ 3,022,789 Homebuilding North East 517,141 462,385 432,145 Homebuilding Mid East 1,250,165 1,192,472 1,014,920 Homebuilding South East 864,528 734,590 595,346 Mortgage Banking 130,319 113,321 93,808 Consolidated revenues $ 6,305,840 $ 5,822,544 $ 5,159,008
Profit before Taxes	(1) This item represents changes to the contract land deposit impairment reserve, which are not allocated to the reportable segments. (2) 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 years presented: Year Ended December 31, 2017 2016 2015 Corporate capital allocation charge: Homebuilding Mid Atlantic $ 123,028 $ 119,758 $ 107,705 Homebuilding North East 16,115 18,132 16,987 Homebuilding Mid East 29,663 28,303 27,263 Homebuilding South East 29,578 23,799 19,215 Total corporate capital allocation charge $ 198,384 $ 189,992 $ 171,170 Year Ended December 31, 2017 2016 2015 Profit before taxes: Homebuilding Mid Atlantic $ 398,494 $ 301,173 $ 322,829 Homebuilding North East 60,218 21,947 37,914 Homebuilding Mid East 149,639 121,166 86,336 Homebuilding South East 95,826 71,098 57,384 Mortgage Banking 73,959 63,711 51,236 Total segment profit 778,136 579,095 555,699 Reconciling items: Contract land deposit reserve adjustment (1) 1,307 10,933 13,805 Equity-based compensation expense (44,562 ) (43,598 ) (54,091 ) Corporate capital allocation (2) 198,384 189,992 171,170 Unallocated corporate overhead (89,514 ) (89,376 ) (83,124 ) Consolidation adjustments and other 26,143 35,204 22,622 Corporate interest expense (22,983 ) (20,553 ) (22,869 ) Reconciling items sub-total 68,775 82,602 47,513 Consolidated profit before taxes $ 846,911 $ 661,697 $ 603,212
Assets	As of December 31, 2017 2016 Assets: Homebuilding Mid Atlantic $ 1,079,225 $ 1,054,779 Homebuilding North East 143,008 126,720 Homebuilding Mid East 263,019 222,736 Homebuilding South East 277,705 214,225 Mortgage Banking 397,052 403,250 Total segment assets 2,160,009 2,021,710 Reconciling items: Cash and cash equivalents 645,087 375,748 Deferred taxes 111,953 170,652 Intangible assets and goodwill 50,144 51,526 Contract land deposit reserve (29,999 ) (31,306 ) Consolidation adjustments and other 52,085 55,613 Reconciling items sub-total 829,270 622,233 Consolidated assets $ 2,989,279 $ 2,643,943
Interest Income	Year Ended December 31, 2017 2016 2015 Interest income: Mortgage Banking $ 7,850 $ 7,569 $ 6,485 Total segment interest income 7,850 7,569 6,485 Other unallocated interest income 4,554 1,111 1,211 Consolidated interest income $ 12,404 $ 8,680 $ 7,696
Interest Expense	Year Ended December 31, 2017 2016 2015 Interest expense: Homebuilding Mid Atlantic $ 123,075 $ 119,808 $ 107,748 Homebuilding North East 16,117 18,141 16,991 Homebuilding Mid East 29,663 28,307 27,263 Homebuilding South East 29,583 23,804 19,217 Mortgage Banking 1,148 1,086 641 Total segment interest expense 199,586 191,146 171,860 Corporate capital allocation (2) (198,384 ) (189,992 ) (171,170 ) Senior Notes and other interest 22,983 20,553 22,869 Consolidated interest expense $ 24,185 $ 21,707 $ 23,559
Depreciation and Amortization	Year Ended December 31, 2017 2016 2015 Depreciation and amortization: Homebuilding Mid Atlantic $ 8,095 $ 8,089 $ 7,876 Homebuilding North East 2,034 2,053 1,571 Homebuilding Mid East 3,590 3,748 4,003 Homebuilding South East 2,531 2,276 2,191 Mortgage Banking 1,297 1,117 1,136 Total segment depreciation and amortization 17,547 17,283 16,777 Unallocated corporate 5,120 4,986 4,757 Consolidated depreciation and amortization $ 22,667 $ 22,269 $ 21,534
Expenditures for Property and Equipment	Year Ended December 31, 2017 2016 2015 Expenditures for property and equipment: Homebuilding Mid Atlantic $ 9,257 $ 8,838 $ 8,287 Homebuilding North East 1,299 3,423 2,220 Homebuilding Mid East 3,117 4,027 3,774 Homebuilding South East 3,313 3,594 1,753 Mortgage Banking 2,723 726 265 Total segment expenditures for property and equipment 19,709 20,608 16,299 Unallocated corporate 560 1,761 1,978 Consolidated expenditures for property and equipment $ 20,269 $ 22,369 $ 18,277
Corporate Capital Allocation Charge	Year Ended December 31, 2017 2016 2015 Corporate capital allocation charge: Homebuilding Mid Atlantic $ 123,028 $ 119,758 $ 107,705 Homebuilding North East 16,115 18,132 16,987 Homebuilding Mid East 29,663 28,303 27,263 Homebuilding South East 29,578 23,799 19,215 Total corporate capital allocation charge $ 198,384 $ 189,992 $ 171,170

Variable Interest Entities (Tab

Variable Interest Entities (Tables)	12 Months Ended
	Dec. 31, 2017
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 December 31, 2017 and 2016 was as follows: December 31, 2017 2016 Contract land deposits $ 400,428 $ 411,150 Loss reserve on contract land deposits (29,999 ) (31,306 ) Contract land deposits, net 370,429 379,844 Contingent obligations in the form of letters of credit 1,996 2,379 Contingent specific performance obligations (1) 1,505 1,505 Total risk of loss $ 373,930 $ 383,728 (1) As of both December 31, 2017 and 2016 , the Company was committed to purchase 10 finished lots under specific performance obligations.

Joint Ventures (Tables)

Joint Ventures (Tables)	12 Months Ended
	Dec. 31, 2017
Consolidated Joint Venture
Schedule of Equity Method Investments [Line Items]
Condensed Balance Sheets	The condensed balance sheets of the consolidated JV at December 31, 2017 and 2016 were as follows: December 31, 2017 2016 Assets: Cash $ 1,069 $ 1,214 Other assets 37 37 Total assets $ 1,106 $ 1,251 Liabilities and equity: Accrued expenses 487 550 Equity 619 701 Total liabilities and equity $ 1,106 $ 1,251

Capitalized Interest (Tables)

Capitalized Interest (Tables)	12 Months Ended
	Dec. 31, 2017
Capitalized Interest Costs, Including Allowance for Funds Used During Construction [Abstract]
Summary of Interest Costs Incurred, Capitalized, Expensed and Charged to Cost of Sales	NVR’s interest costs incurred, capitalized, expensed and charged to cost of sales during the years ended December 31, 2017 , 2016 and 2015 was as follows: December 31, 2017 2016 2015 Interest capitalized, beginning of year $ 5,106 $ 4,434 $ 4,072 Interest incurred 26,384 25,951 25,155 Interest charged to interest expense (24,185 ) (21,707 ) (23,559 ) Interest charged to cost of sales (1,722 ) (3,572 ) (1,234 ) Interest capitalized, end of year $ 5,583 $ 5,106 $ 4,434

Property, Plant and Equipment29

Property, Plant and Equipment ("PP&E") (Tables)	12 Months Ended
	Dec. 31, 2017
Property, Plant and Equipment [Abstract]
Summary of Property, Plant and Equipment ("PP&E")	December 31, 2017 2016 Homebuilding: Office facilities and other $ 35,219 $ 33,352 Model home furniture and fixtures 33,901 34,924 Production facilities 61,348 58,068 Gross Homebuilding PP&E 130,468 126,344 Less: accumulated depreciation (87,277 ) (80,429 ) Net Homebuilding PP&E $ 43,191 $ 45,915 Mortgage Banking: Office facilities and other $ 14,069 $ 11,379 Less: accumulated depreciation (7,742 ) (6,476 ) Net Mortgage Banking PP&E $ 6,327 $ 4,903

Common Stock (Tables)

Common Stock (Tables)	12 Months Ended
	Dec. 31, 2017
Equity [Abstract]
Share Repurchases of Common Stock	The Company made the following share repurchases during the years indicated: Year Ended December 31, 2017 2016 2015 Aggregate purchase price $ 422,166 $ 455,351 $ 431,367 Number of shares repurchased 167 280 290

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Provision for Income Taxes	The provision for income taxes consists of the following: Year Ended December 31, 2017 2016 2015 Current: Federal $ 211,641 $ 209,454 $ 180,895 State 37,006 38,095 36,142 Deferred: Federal 60,785 (9,230 ) 2,681 State (42 ) (1,884 ) 567 $ 309,390 $ 236,435 $ 220,285
Income Tax Benefits in Shareholders' Equity	In addition to amounts applicable to income before taxes, the following income tax benefits were recorded in shareholders’ equity: Year Ended December 31, 2017 2016 2015 Income tax benefits arising from compensation expense for tax purposes in excess of amounts recognized for financial statement purposes (1) $ — $ 13,661 $ 23,311 (1) During 2017, these income tax benefits were recognized in the consolidated statement of income as required under ASU 2016-09.
Deferred Income Taxes on Consolidated Balance Sheets	Deferred income taxes on NVR’s consolidated balance sheets were comprised of the following: December 31, 2017 2016 Deferred tax assets: Other accrued expenses and contract land deposit reserve $ 49,063 $ 76,498 Deferred compensation 4,743 7,075 Equity-based compensation expense 36,799 55,077 Inventory 9,393 13,514 Unrecognized tax benefit 14,351 23,954 Other 9,681 10,106 Total deferred tax assets 124,030 186,224 Less: Deferred tax liabilities 4,511 5,414 Net deferred tax asset $ 119,519 $ 180,810
Income Tax Expense Reconciliation	A reconciliation of income tax expense in the accompanying consolidated statements of income to the amount computed by applying the statutory federal income tax rate of 35% to income before taxes is as follows: Year Ended December 31, 2017 2016 2015 Income taxes computed at the federal statutory rate $ 296,419 $ 231,595 $ 211,124 State income taxes, net of federal income tax benefit (1) 30,046 23,738 23,919 Excess tax benefits from equity-based compensation (58,681 ) — — Remeasurement of net deferred tax assets due to enactment of Tax Cut and Jobs Act 62,702 — — Other, net (2) (21,096 ) (18,898 ) (14,758 ) $ 309,390 $ 236,435 $ 220,285 (1) Excludes state excess tax benefits from equity-based compensation included in the line below. (2) Primarily attributable to tax benefits from the domestic production activities deduction.
Reconciliation of Unrecognized Tax Benefits	A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows: Year Ended December 31, 2017 2016 Balance at beginning of year $ 46,110 $ 46,591 Additions based on tax positions related to the current year 4,793 4,440 Reductions for tax positions of prior years (5,566 ) (4,921 ) Settlements — — Balance at end of year $ 45,337 $ 46,110

Equity-Based Compensation, Pr32

Equity-Based Compensation, Profit Sharing and Deferred Compensation Plans (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Summary of Equity-Based Compensation Plans with Grants Outstanding	The following table provides a summary of each of the Company’s equity-based compensation plans for any plan with grants outstanding at December 31, 2017 : Equity-Based Compensation Plans Shares Authorized Options/RSUs Outstanding Shares Available to Issue 1998 Management Long-Term Stock Option Plan 1,000 6 — 2000 Broadly-Based Stock Option Plan 2,000 89 — 2010 Equity Incentive Plan (1) 700 218 38 2014 Equity Incentive Plan (2) 950 613 276 (1) During 2010, the Company’s shareholders approved the 2010 Equity Incentive Plan (the “2010 Plan”). The 2010 Plan authorizes the Company to issue Options and RSUs to key management employees, including executive officers and Board members. Of the 700 aggregate shares available to issue, up to 240 may be granted in the form of RSUs. There were 208 Options and 10 RSUs outstanding as of December 31, 2017 . Of the 38 shares available to be issued under the 2010 Plan, substantially all may be granted as RSUs. (2) During 2014, the Company’s shareholders approved the 2014 Equity Incentive Plan (the “2014 Plan”). The 2014 Plan authorizes the Company to issue Options to key management employees, including executive officers and Board members. Option grants under the 2014 Plan are generally divided such that vesting for 50% of the Option grant is solely contingent upon continued employment or continued service as a Director, while vesting for the remaining 50% of the Option grant is contingent upon both continued employment or service as a Director and the achievement of a performance metric. The performance metric is based on the Company’s return on capital performance relative to a peer group during a specified three year period based on the date of Option grant, with the initial performance period being 2014 through 2016. Based on the Company's return on capital performance, the initial performance period metric was met. Future vesting of Option grants subject to the initial performance period are subject only to continued employment or continued service as a director. Options granted under the 2014 Plan vest annually over four years in 25% increments beginning on December 31, 2016, or later based on the date of grant.
Equity-Based Compensation Plans	The following table provides additional information relative to NVR’s equity-based compensation plans for the year ended December 31, 2017 : Shares Weighted Avg. Per Share Exercise Price Weighted Avg. Remaining Contract Life (years) Aggregate Intrinsic Value Stock Options Outstanding at December 31, 2016 1,076 $ 1,048.38 Granted 30 2,431.54 Exercised (159 ) 886.41 Forfeited (31 ) 1,099.68 Outstanding at December 31, 2017 916 $ 1,119.92 6.0 $ 2,187,430 Exercisable at December 31, 2017 461 $ 957.50 5.0 $ 1,176,843 RSUs Outstanding at December 31, 2016 16 Granted — Vested (6 ) Forfeited — Outstanding at December 31, 2017 10 $ 34,945 Vested, but not issued at December 31, 2017 5 $ 18,344
Black-Scholes Option-Pricing Model Assumptions	The fair value of the Options granted during 2017 , 2016 and 2015 was estimated on the grant date using the Pricing Model, based on the following assumptions: 2017 2016 2015 Estimated option life (years) 5.26 5.27 5.17 Risk free interest rate (range) 1.53%-2.38% 0.86%-2.21% 1.04%-2.07% Expected volatility (range) 15.09%-17.95% 15.91%-23.49% 17.00%-26.79% Expected dividend rate — % — % — % Weighted average grant-date fair value per share of options granted $ 494.17 $ 320.21 $ 296.50
Exercised Option Proceeds	Information with respect to the vested RSUs and exercised Options is as follows: Year Ended December 31, 2017 2016 2015 Aggregate exercise proceeds (1) $ 140,525 $ 38,106 $ 85,948 Aggregate intrinsic value on exercise dates $ 206,890 $ 96,600 $ 99,288 (1) Aggregate exercise proceeds include the Option exercise price received in cash or the fair market value of NVR stock surrendered by the optionee in lieu of cash.

Commitments and Contingent Li33

Commitments and Contingent Liabilities (Tables)	12 Months Ended
	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Future Minimum Lease Payments under Operating Leases	Future minimum lease payments under these operating leases as of December 31, 2017 are as follows: Year Ending December 31, 2018 $ 29,366 2019 21,569 2020 17,799 2021 13,436 2022 10,780 Thereafter 17,202 110,152 Sublease income (30 ) $ 110,122
Summary of Changes in Product Warranties Reserve	The following table reflects the changes in the Company’s warranty reserve (see Note 1 herein for further discussion of warranty/product liability reserves): Year Ended December 31, 2017 2016 2015 Warranty reserve, beginning of year $ 93,895 $ 87,407 $ 94,060 Provision 44,652 50,787 47,003 Payments (44,034 ) (44,299 ) (53,656 ) Warranty reserve, end of year $ 94,513 $ 93,895 $ 87,407

Fair Value (Tables)

Fair Value (Tables)	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Undesignated Derivative Instruments	The fair value measurement of NVRM's undesignated derivative instruments was as follows: As of December 31, 2017 2016 Rate lock commitments: Gross assets $ 5,400 $ 5,403 Gross liabilities 1,832 3,327 Net rate lock commitments $ 3,568 $ 2,076 Forward sales contracts: Gross assets $ 992 $ 9,148 Gross liabilities 667 1,084 Net forward sales contracts $ 325 $ 8,064
Fair Value Measurement	The fair value measurement as of December 31, 2017 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 $ 490,184 $ (666 ) $ (407 ) $ 4,641 $ — $ 3,568 Forward sales contracts $ 705,405 — — — 325 325 Mortgages held for sale $ 350,558 (204 ) (1,726 ) 3,861 — 1,931 Total fair value measurement $ (870 ) $ (2,133 ) $ 8,502 $ 325 $ 5,824

Quarterly Results (unaudited) (

Quarterly Results (unaudited) (Tables)	12 Months Ended
	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Data and Operating Information	The following table sets forth unaudited selected financial data and operating information on a quarterly basis for the years ended December 31, 2017 and 2016 . Year Ended December 31, 2017 4th Quarter 3rd Quarter 2nd Quarter 1st Quarter Revenues – homebuilding operations $ 1,781,494 $ 1,633,726 $ 1,512,714 $ 1,247,587 Gross profit – homebuilding operations $ 343,187 $ 325,755 $ 294,631 $ 221,570 Mortgage banking fees $ 34,842 $ 34,194 $ 31,778 $ 29,505 Net income $ 124,619 $ 162,102 $ 147,877 $ 102,923 Diluted earnings per share $ 28.88 $ 38.02 $ 35.19 $ 25.12 New orders (units) 4,306 4,200 4,678 4,424 Settlements (units) 4,630 4,158 3,917 3,256 Backlog, end of period (units) 8,531 8,855 8,813 8,052 Loans closed $ 1,229,695 $ 1,115,494 $ 1,041,613 $ 843,341 Year Ended December 31, 2016 4th Quarter 3rd Quarter 2nd Quarter 1st Quarter Revenues – homebuilding operations $ 1,718,527 $ 1,507,451 $ 1,361,741 $ 1,121,504 Gross profit – homebuilding operations $ 305,087 $ 265,159 $ 235,372 $ 195,744 Mortgage banking fees $ 34,239 $ 30,118 $ 26,442 $ 22,522 Net income $ 150,891 $ 117,392 $ 91,676 $ 65,303 Diluted earnings per share $ 37.80 $ 28.46 $ 22.01 $ 15.79 New orders (units) 3,645 3,477 4,324 4,137 Settlements (units) 4,419 3,922 3,581 3,006 Backlog, end of period (units) 6,884 7,658 8,103 7,360 Loans closed $ 1,201,164 $ 1,055,163 $ 942,407 $ 753,840

Summary of Significant Accoun36

Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Significant Accounting Policies [Line Items]
Cash	$ 667,863,000	$ 396,619,000	$ 425,316,000	$ 545,419,000
Contract land deposit impairments (recoveries), net	(1,238,000)	4,269,000	11,058,000
Contract land deposit assets impairment valuation allowances	29,999,000	31,306,000
Excess tax benefits from equity-based compensation	$ 58,681,000	0	0
Adjustment to additional paid in capital, income tax effect from share-based compensation, net		13,661,000	23,311,000
Cumulative-effect adjustment from adoption of ASU 2016-09, net of tax		609,000
Retained Earnings
Significant Accounting Policies [Line Items]
Cumulative-effect adjustment from adoption of ASU 2016-09, net of tax		(957,000)
Accounting Standards Update 2016-09
Significant Accounting Policies [Line Items]
Operating activities		13,661,000	23,311,000
Financing activities		13,661,000	$ 23,311,000
Accounting Standards Update 2016-09 | Retained Earnings
Significant Accounting Policies [Line Items]
Cumulative-effect adjustment from adoption of ASU 2016-09, net of tax		(957,000)
Model home furniture and fixtures
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	2 years
Office facilities and other | Minimum
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Office facilities and other | Maximum
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	10 years
Manufacturing Facilities | Minimum
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Manufacturing Facilities | Maximum
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	40 years
Homebuilding:
Significant Accounting Policies [Line Items]
Cash	$ 645,087,000	375,748,000
Impairment of goodwill	0
Homebuilding: | Heartland Homes Inc
Significant Accounting Policies [Line Items]
Finite-lived intangibles acquired from business acquisition, net of accumulated amortization	$ 776,000	2,158,000
Weighted average life of finite-lived intangible assets	5 years
Goodwill acquired from business acquisition	$ 441,000	441,000
Mortgage Banking:
Significant Accounting Policies [Line Items]
Cash	$ 21,707,000	19,657,000
Mortgage Banking: | Level 2 | Fair Value, Measurements, Recurring
Significant Accounting Policies [Line Items]
Typical length of days loans sold into secondary market	30 days
Mortgage Banking: | Level 2 | Fair Value, Measurements, Recurring | Rate lock commitments
Significant Accounting Policies [Line Items]
Notional or Principal Amount	$ 490,184,000
Mortgage Banking: | Level 2 | Fair Value, Measurements, Recurring | Forward sales contracts
Significant Accounting Policies [Line Items]
Notional or Principal Amount	705,405,000
Consolidated Joint Venture
Significant Accounting Policies [Line Items]
Cash	$ 1,069,000	$ 1,214,000

Summary of Significant Accoun37

Summary of Significant Accounting Policies - Weighted Average Shares and Share Equivalents Used to Calculate Basic and Diluted Earnings Per Share (Detail) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accounting Policies [Abstract]
Weighted average number of shares outstanding used to calculate basic EPS (in Shares)	3,733	3,847	4,022
Dilutive securities:
Stock options and restricted share units (in Shares)	507	257	233
Weighted average number of shares and share equivalents outstanding used to calculate diluted EPS (in Shares)	4,240	4,104	4,255

Summary of Significant Accoun38

Summary of Significant Accounting Policies - Summary of Antidilutive Securities Excluded from Computation of Earnings Per Share (Detail) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accounting Policies [Abstract]
Anti-dilutive securities (in Shares)	15	87	50

Segment Information, Nature o39

Segment Information, Nature of Operations, and Certain Concentrations - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2017Trade_Namesmetropolitan_areasegment	Sep. 10, 2012
Segment Reporting Information [Line Items]
Number of trade names | Trade_Names	3
Number of metropolitan areas Ryan Homes product are sold | metropolitan_area	29
Senior Notes due 2022
Segment Reporting Information [Line Items]
Senior notes interest rate	3.95%	3.95%
Homebuilding:
Segment Reporting Information [Line Items]
Number of reportable segments	4
Mortgage Banking:
Segment Reporting Information [Line Items]
Number of reportable segments	1
Geographic Concentration Risk | Homebuilding: | District of Columbia
Segment Reporting Information [Line Items]
Revenue derived	30.00%
Geographic Concentration Risk | Homebuilding: | Maryland, Baltimore
Segment Reporting Information [Line Items]
Revenue derived	11.00%

Segment Information, Nature o40

Segment Information, Nature of Operations, and Certain Concentrations - Revenues (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting, Revenue Reconciling Item [Line Items]
Consolidated revenues									$ 6,305,840	$ 5,822,544	$ 5,159,008
Homebuilding:
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 1,781,494	$ 1,633,726	$ 1,512,714	$ 1,247,587	$ 1,718,527	$ 1,507,451	$ 1,361,741	$ 1,121,504	6,175,521	5,709,223	5,065,200
Homebuilding: | Mid Atlantic
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues									3,543,687	3,319,776	3,022,789
Homebuilding: | North East
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues									517,141	462,385	432,145
Homebuilding: | Mid East
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues									1,250,165	1,192,472	1,014,920
Homebuilding: | South East
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues									864,528	734,590	595,346
Mortgage Banking:
Segment Reporting, Revenue Reconciling Item [Line Items]
Mortgage Banking	$ 34,842	$ 34,194	$ 31,778	$ 29,505	$ 34,239	$ 30,118	$ 26,442	$ 22,522	$ 130,319	$ 113,321	$ 93,808

Segment Information, Nature o41

Segment Information, Nature of Operations, and Certain Concentrations - Profit before Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Profit before taxes	$ 846,911	$ 661,697	$ 603,212
Equity-based compensation expense	(44,562)	(43,598)	(54,091)
Corporate interest expense	(24,185)	(21,707)	(23,559)
Homebuilding:
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Profit before taxes	776,370	601,102	555,329
Corporate interest expense	(23,037)	(20,621)	(22,918)
Mortgage Banking:
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Profit before taxes	70,541	60,595	47,883
Corporate interest expense	(1,148)	(1,086)	(641)
Profit before taxes:
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Profit before taxes	778,136	579,095	555,699
Corporate interest expense	(199,586)	(191,146)	(171,860)
Profit before taxes: | Homebuilding: | Mid Atlantic
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Profit before taxes	398,494	301,173	322,829
Corporate interest expense	(123,075)	(119,808)	(107,748)
Profit before taxes: | Homebuilding: | North East
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Profit before taxes	60,218	21,947	37,914
Corporate interest expense	(16,117)	(18,141)	(16,991)
Profit before taxes: | Homebuilding: | Mid East
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Profit before taxes	149,639	121,166	86,336
Corporate interest expense	(29,663)	(28,307)	(27,263)
Profit before taxes: | Homebuilding: | South East
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Profit before taxes	95,826	71,098	57,384
Corporate interest expense	(29,583)	(23,804)	(19,217)
Profit before taxes: | Mortgage Banking:
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Profit before taxes	73,959	63,711	51,236
Corporate interest expense	(1,148)	(1,086)	(641)
Reconciling items:
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Profit before taxes	68,775	82,602	47,513
Contract land deposit reserve adjustment	1,307	10,933	13,805
Equity-based compensation expense	(44,562)	(43,598)	(54,091)
Corporate capital allocation charge	198,384	189,992	171,170
Unallocated corporate overhead	(89,514)	(89,376)	(83,124)
Consolidation adjustments and other	26,143	35,204	22,622
Corporate interest expense	(22,983)	(20,553)	(22,869)
Reconciling items: | Homebuilding: | Mid Atlantic
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Corporate capital allocation charge	123,028	119,758	107,705
Reconciling items: | Homebuilding: | North East
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Corporate capital allocation charge	16,115	18,132	16,987
Reconciling items: | Homebuilding: | Mid East
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Corporate capital allocation charge	29,663	28,303	27,263
Reconciling items: | Homebuilding: | South East
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Corporate capital allocation charge	$ 29,578	$ 23,799	$ 19,215

Segment Information, Nature o42

Segment Information, Nature of Operations, and Certain Concentrations - Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 2,989,279	$ 2,643,943
Cash and cash equivalents	667,863	396,619	$ 425,316	$ 545,419
Contract land deposit reserve	(29,999)	(31,306)
Homebuilding:
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	2,584,880	2,233,346
Cash and cash equivalents	645,087	375,748
Deferred taxes	111,953	170,652
Mortgage Banking:
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	404,399	410,597
Cash and cash equivalents	21,707	19,657
Profit before taxes:
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	2,160,009	2,021,710
Profit before taxes: | Homebuilding: | Mid Atlantic
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	1,079,225	1,054,779
Profit before taxes: | Homebuilding: | North East
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	143,008	126,720
Profit before taxes: | Homebuilding: | Mid East
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	263,019	222,736
Profit before taxes: | Homebuilding: | South East
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	277,705	214,225
Profit before taxes: | Mortgage Banking:
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	397,052	403,250
Reconciling items:
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	829,270	622,233
Cash and cash equivalents	645,087	375,748
Deferred taxes	111,953	170,652
Intangible assets and goodwill	50,144	51,526
Contract land deposit reserve	(29,999)	(31,306)
Consolidation adjustments and other	$ 52,085	$ 55,613

Segment Information, Nature o43

Segment Information, Nature of Operations, and Certain Concentrations - Interest Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting, Other Significant Reconciling Item [Line Items]
Consolidated interest income	$ 12,404	$ 8,680	$ 7,696
Mortgage Banking:
Segment Reporting, Other Significant Reconciling Item [Line Items]
Interest income	7,850	7,569	6,485
Profit before taxes:
Segment Reporting, Other Significant Reconciling Item [Line Items]
Interest income	7,850	7,569	6,485
Other unallocated interest income
Segment Reporting, Other Significant Reconciling Item [Line Items]
Other unallocated interest income	$ 4,554	$ 1,111	$ 1,211

Segment Information, Nature o44

Segment Information, Nature of Operations, and Certain Concentrations - Interest Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting, Other Significant Reconciling Item [Line Items]
Consolidated interest expense	$ 24,185	$ 21,707	$ 23,559
Homebuilding:
Segment Reporting, Other Significant Reconciling Item [Line Items]
Consolidated interest expense	23,037	20,621	22,918
Mortgage Banking:
Segment Reporting, Other Significant Reconciling Item [Line Items]
Consolidated interest expense	1,148	1,086	641
Profit before taxes:
Segment Reporting, Other Significant Reconciling Item [Line Items]
Consolidated interest expense	199,586	191,146	171,860
Profit before taxes: | Homebuilding: | Mid Atlantic
Segment Reporting, Other Significant Reconciling Item [Line Items]
Consolidated interest expense	123,075	119,808	107,748
Profit before taxes: | Homebuilding: | North East
Segment Reporting, Other Significant Reconciling Item [Line Items]
Consolidated interest expense	16,117	18,141	16,991
Profit before taxes: | Homebuilding: | Mid East
Segment Reporting, Other Significant Reconciling Item [Line Items]
Consolidated interest expense	29,663	28,307	27,263
Profit before taxes: | Homebuilding: | South East
Segment Reporting, Other Significant Reconciling Item [Line Items]
Consolidated interest expense	29,583	23,804	19,217
Profit before taxes: | Mortgage Banking:
Segment Reporting, Other Significant Reconciling Item [Line Items]
Consolidated interest expense	1,148	1,086	641
Reconciling items:
Segment Reporting, Other Significant Reconciling Item [Line Items]
Consolidated interest expense	22,983	20,553	22,869
Corporate capital allocation charge	198,384	189,992	171,170
Reconciling items: | Homebuilding: | Mid Atlantic
Segment Reporting, Other Significant Reconciling Item [Line Items]
Corporate capital allocation charge	123,028	119,758	107,705
Reconciling items: | Homebuilding: | North East
Segment Reporting, Other Significant Reconciling Item [Line Items]
Corporate capital allocation charge	16,115	18,132	16,987
Reconciling items: | Homebuilding: | Mid East
Segment Reporting, Other Significant Reconciling Item [Line Items]
Corporate capital allocation charge	29,663	28,303	27,263
Reconciling items: | Homebuilding: | South East
Segment Reporting, Other Significant Reconciling Item [Line Items]
Corporate capital allocation charge	$ 29,578	$ 23,799	$ 19,215

Segment Information, Nature o45

Segment Information, Nature of Operations, and Certain Concentrations - Depreciation and Amortization (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting, Other Significant Reconciling Item [Line Items]
Consolidated depreciation and amortization	$ 22,667	$ 22,269	$ 21,534
Profit before taxes:
Segment Reporting, Other Significant Reconciling Item [Line Items]
Consolidated depreciation and amortization	17,547	17,283	16,777
Profit before taxes: | Homebuilding: | Mid Atlantic
Segment Reporting, Other Significant Reconciling Item [Line Items]
Consolidated depreciation and amortization	8,095	8,089	7,876
Profit before taxes: | Homebuilding: | North East
Segment Reporting, Other Significant Reconciling Item [Line Items]
Consolidated depreciation and amortization	2,034	2,053	1,571
Profit before taxes: | Homebuilding: | Mid East
Segment Reporting, Other Significant Reconciling Item [Line Items]
Consolidated depreciation and amortization	3,590	3,748	4,003
Profit before taxes: | Homebuilding: | South East
Segment Reporting, Other Significant Reconciling Item [Line Items]
Consolidated depreciation and amortization	2,531	2,276	2,191
Profit before taxes: | Mortgage Banking:
Segment Reporting, Other Significant Reconciling Item [Line Items]
Consolidated depreciation and amortization	1,297	1,117	1,136
Other unallocated interest income
Segment Reporting, Other Significant Reconciling Item [Line Items]
Consolidated depreciation and amortization	$ 5,120	$ 4,986	$ 4,757

Segment Information, Nature o46

Segment Information, Nature of Operations, and Certain Concentrations - Expenditures for Property and Equipment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting, Other Significant Reconciling Item [Line Items]
Expenditures for property and equipment:	$ 20,269	$ 22,369	$ 18,277
Profit before taxes:
Segment Reporting, Other Significant Reconciling Item [Line Items]
Expenditures for property and equipment:	19,709	20,608	16,299
Profit before taxes: | Homebuilding: | Mid Atlantic
Segment Reporting, Other Significant Reconciling Item [Line Items]
Expenditures for property and equipment:	9,257	8,838	8,287
Profit before taxes: | Homebuilding: | North East
Segment Reporting, Other Significant Reconciling Item [Line Items]
Expenditures for property and equipment:	1,299	3,423	2,220
Profit before taxes: | Homebuilding: | Mid East
Segment Reporting, Other Significant Reconciling Item [Line Items]
Expenditures for property and equipment:	3,117	4,027	3,774
Profit before taxes: | Homebuilding: | South East
Segment Reporting, Other Significant Reconciling Item [Line Items]
Expenditures for property and equipment:	3,313	3,594	1,753
Profit before taxes: | Mortgage Banking:
Segment Reporting, Other Significant Reconciling Item [Line Items]
Expenditures for property and equipment:	2,723	726	265
Other unallocated interest income
Segment Reporting, Other Significant Reconciling Item [Line Items]
Expenditures for property and equipment:	$ 560	$ 1,761	$ 1,978

Segment Information, Nature o47

Segment Information, Nature of Operations, and Certain Concentrations - Corporate Capital Allocation Charge (Detail) - Reconciling items: - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting, Other Significant Reconciling Item [Line Items]
Corporate capital allocation charge	$ 198,384	$ 189,992	$ 171,170
Homebuilding: | Mid Atlantic
Segment Reporting, Other Significant Reconciling Item [Line Items]
Corporate capital allocation charge	123,028	119,758	107,705
Homebuilding: | North East
Segment Reporting, Other Significant Reconciling Item [Line Items]
Corporate capital allocation charge	16,115	18,132	16,987
Homebuilding: | Mid East
Segment Reporting, Other Significant Reconciling Item [Line Items]
Corporate capital allocation charge	29,663	28,303	27,263
Homebuilding: | South East
Segment Reporting, Other Significant Reconciling Item [Line Items]
Corporate capital allocation charge	$ 29,578	$ 23,799	$ 19,215

Variable Interest Entities - Ad

Variable Interest Entities - Additional Information (Detail) $ in Thousands	Dec. 31, 2017USD ($)lot	Dec. 31, 2016USD ($)
Variable Interest Entity [Line Items]
Maximum range of deposits required under the purchase agreements	10.00%
Contract land deposits in cash	$ 400,428	$ 411,150
Variable Interest Entities
Variable Interest Entity [Line Items]
Maximum range of deposits required under the purchase agreements	10.00%
Lots controlled by NVR | lot	84,300
Contract land deposits in cash under Lot Purchase Agreements	$ 393,900
Letters of credit related to lots	$ 1,900
Contract on Raw Ground with Landowners
Variable Interest Entity [Line Items]
Lots controlled by NVR | lot	10,700
Contract land deposits in cash	$ 6,600
Letters of credit on raw land contracts	100
Refundable deposits	$ 5,800

Variable Interest Entities - To

Variable Interest Entities - Total Risk of Loss Related to Contract Land Deposits (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure [Abstract]
Contract land deposits	$ 400,428	$ 411,150
Loss reserve on contract land deposits	(29,999)	(31,306)
Contract land deposits, net	370,429	379,844
Contingent obligations in the form of letters of credit	1,996	2,379
Contingent specific performance obligations	1,505	1,505
Total risk of loss	$ 373,930	$ 383,728

Variable Interest Entities - 50

Variable Interest Entities - Total Risk of Loss Related to Contract Land Deposits (Textual) (Detail) - lot	Dec. 31, 2017	Dec. 31, 2016
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure [Abstract]
Finished lots committed to purchase under specific performance obligations	10	10

Joint Ventures - Additional Inf

Joint Ventures - Additional Information (Detail) $ in Thousands	Dec. 31, 2017USD ($)lotjoint_venture	Dec. 31, 2016USD ($)lotjoint_venture
Joint Ventures [Line Items]
Aggregate investment | $	$ 45,500	$ 49,400
Number of joint ventures | joint_venture	6	6
Expected production of finished lots | lot	7,300	7,400
Total lots controlled by company under the joint venture | lot	3,900	4,200
Total lots either under contract with unrelated parties or not under the current contract | lot	3,400	3,200
Additional funding commitments in the aggregate | $	$ 5,300	$ 6,200
Number of joint ventures with additional funding commitment | joint_venture	3	3
Number of joint ventures NVR is not primary beneficiary | joint_venture	5
Other Assets
Joint Ventures [Line Items]
Aggregate investment | $	$ 45,200	$ 49,000

Joint Ventures - Condensed Bala

Joint Ventures - Condensed Balance Sheets (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Assets:
Cash	$ 667,863	$ 396,619	$ 425,316	$ 545,419
Liabilities and equity:
Equity	1,605,492	1,304,441	$ 1,239,165	$ 1,124,255
Total liabilities and shareholders' equity	2,989,279	2,643,943
Consolidated Joint Venture
Assets:
Cash	1,069	1,214
Other assets	37	37
Total assets	1,106	1,251
Liabilities and equity:
Accrued expenses	487	550
Equity	619	701
Total liabilities and shareholders' equity	$ 1,106	$ 1,251

Land Under Development - Additi

Land Under Development - Additional Information (Detail) $ in Thousands	1 Months Ended	12 Months Ended
	Oct. 31, 2017USD ($)lot	Dec. 31, 2017USD ($)lotparcel	Dec. 31, 2016USD ($)lotparcel
Real Estate [Abstract]
Acquisition costs of land under development and finished lots	$ 14,800
Number of finished lots for use in homebuilding operations | lot	150	500	600
Number of raw parcels of land owned | parcel		4	4
Carrying value of raw parcels of land		$ 34,212	$ 46,999
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	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Capitalized Interest Costs Including Allowance for Funds Used During Construction RollForward
Interest capitalized, beginning of year	$ 5,106	$ 4,434	$ 4,072
Interest incurred	26,384	25,951	25,155
Interest expense	(24,185)	(21,707)	(23,559)
Interest charged to cost of sales	(1,722)	(3,572)	(1,234)
Interest capitalized, end of year	$ 5,583	$ 5,106	$ 4,434

Related Party Transactions - Ad

Related Party Transactions - Additional Information (Detail) - Elm Street	12 Months Ended
	Dec. 31, 2017USD ($)lot	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Related Party Transaction [Line Items]
Related party forward lot purchase agreements purchase price	$ 66,600,000
Number of related parties for forward lot purchase agreement | lot	1
Market price of developed lots	$ 37,100,000	$ 44,500,000	$ 41,200,000
Expected number of lots from joint venture with Elm Street | lot	2,400
Additional funding to joint venture by NVR and Elm Street	$ 2,900,000
Development costs to manage property under related party transactions	$ 0	$ 143,000	$ 143,000

Property Plant and Equipment ("

Property Plant and Equipment ("PP&E") - Summary of Property Plant and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Homebuilding:
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 130,468	$ 126,344
Less: accumulated depreciation	(87,277)	(80,429)
Net Homebuilding PP&E	43,191	45,915
Homebuilding: | Office facilities and other
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	35,219	33,352
Homebuilding: | Model home furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	33,901	34,924
Homebuilding: | Production facilities
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	61,348	58,068
Mortgage Banking:
Property, Plant and Equipment [Line Items]
Net Homebuilding PP&E	6,327	4,903
Mortgage Banking: | Office facilities and other
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	14,069	11,379
Less: accumulated depreciation	(7,742)	(6,476)
Net Homebuilding PP&E	$ 6,327	$ 4,903

Debt - Additional Information (

Debt - Additional Information (Detail) - USD ($)	Jul. 27, 2016	Jul. 15, 2016	Sep. 10, 2012	Dec. 31, 2017	Jul. 26, 2017	Dec. 31, 2016
Senior Notes due 2022
Debt Instrument [Line Items]
Debt issuance date			Sep. 10, 2012
Senior notes principal amount			$ 600,000,000
Senior notes maturity date			Sep. 15, 2022
Senior notes effective interest rate			3.97%
Senior notes proceeds			$ 593,900,000
Senior notes interest rate			3.95%	3.95%
Frequency of senior notes payment			semi-annually in arrears on March 15 and September 15
Debt issuance cost				$ 2,395,000		$ 2,904,000
Credit Agreement | Revolving Credit Facility
Debt Instrument [Line Items]
Maximum loan borrowing capacity		$ 200,000,000
Increase in commitment available		$ 300,000,000
Line of credit facility, interest rate description				Borrowings under the Credit Agreement generally bear interest for Base Rate Loans at a Base Rate equal to the highest of (i) a Federal Funds Rate plus one-half of one percent, (ii) Bank of America’s publicly announced “prime rate,” and (iii) the Eurodollar Rate plus one percent, plus the Applicable Rate which is based on the Company’s debt rating, or for Eurodollar Rate Loans, at the Eurodollar Rate equal to LIBOR plus the Applicable Rate.
Expiration date		Jul. 15, 2021
Debt outstanding				$ 0
Credit Agreement | Revolving Credit Facility | Federal Funds Rate
Debt Instrument [Line Items]
Debt instrument, marginal interest rate		0.50%
Credit Agreement | Revolving Credit Facility | Eurodollar Rate
Debt Instrument [Line Items]
Debt instrument, marginal interest rate		1.00%
Credit Agreement | Revolving Credit Facility | Sublimit for Issuance of Letters of Credit
Debt Instrument [Line Items]
Maximum loan borrowing capacity		$ 100,000,000
Letters of credit outstanding				$ 7,300,000
Credit Agreement | Revolving Credit Facility | Sublimit for Swing Line Commitment
Debt Instrument [Line Items]
Maximum loan borrowing capacity		$ 25,000,000
Repurchase Agreement | Revolving Credit Facility
Debt Instrument [Line Items]
Senior notes interest rate				3.75%
Maximum loan borrowing capacity					$ 150,000,000
Increase in commitment available	$ 50,000,000
Expiration date				Jul. 25, 2018
Debt outstanding				$ 0		$ 0
Borrowing base limitations				$ 0
Repurchase Agreement | Revolving Credit Facility | Minimum
Debt Instrument [Line Items]
Senior notes interest rate				2.125%

Common Stock - Additional Infor

Common Stock - Additional Information (Detail) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Stockholders' Equity [Abstract]
Common shares outstanding (in Shares)	3,691	3,693
Reissued shares during the period, shares (in Shares)	165	83	131

Common Stock - Share Repurchase

Common Stock - Share Repurchase of Common Stock (Detail) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Stockholders' Equity [Abstract]
Aggregate purchase price	$ 422,166	$ 455,351	$ 431,367
Number of shares repurchased (in Shares)	167	280	290

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Remeasurement of net deferred tax assets due to enactment of Tax Cut and Jobs Act	$ 62,702	$ 0	$ 0
Excess tax benefits from equity-based compensation	58,681	0	$ 0
Estimated federal taxable income	$ 614,562	$ 578,882
Statutory federal income tax rate	35.00%
Effective tax rate	36.53%	35.73%	36.52%
Unrecognized tax benefits that would affect effective tax rate	$ 35,816
Reversal of accrued interest on unrecognized tax benefits	1,065	$ 1,582
Unrecognized tax benefits expense				$ 125
Total accrued interest on unrecognized tax benefits	18,575	$ 19,639
Reduction in unrecognized tax benefits	$ 11,971

Income Taxes - Provision for In

Income Taxes - Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current:
Federal	$ 211,641	$ 209,454	$ 180,895
State	37,006	38,095	36,142
Deferred:
Federal	60,785	(9,230)	2,681
State	(42)	(1,884)	567
Total	$ 309,390	$ 236,435	$ 220,285

Income Taxes - Income Tax Benef

Income Taxes - Income Tax Benefits in Shareholders' Equity (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Income tax benefits arising from compensation expense for tax purposes in excess of amounts recognized for financial statement purposes	$ 0	$ 13,661	$ 23,311

Income Taxes - Deferred Income

Income Taxes - Deferred Income Taxes on Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets:
Other accrued expenses and contract land deposit reserve	$ 49,063	$ 76,498
Deferred compensation	4,743	7,075
Equity-based compensation expense	36,799	55,077
Inventory	9,393	13,514
Unrecognized tax benefit	14,351	23,954
Other	9,681	10,106
Total deferred tax assets	124,030	186,224
Less: Deferred tax liabilities	4,511	5,414
Net deferred tax asset	$ 119,519	$ 180,810

Income Taxes - Income Tax Expen

Income Taxes - Income Tax Expense Reconciliation (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Income taxes computed at the federal statutory rate	$ 296,419	$ 231,595	$ 211,124
State income taxes, net of federal income tax benefit	30,046	23,738	23,919
Excess tax benefits from equity-based compensation	(58,681)	0	0
Remeasurement of net deferred tax assets due to enactment of Tax Cut and Jobs Act	62,702	0	0
Other, net	(21,096)	(18,898)	(14,758)
Total	$ 309,390	$ 236,435	$ 220,285

Income Taxes - Reconciliation o

Income Taxes - Reconciliation of Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of year	$ 46,110	$ 46,591
Additions based on tax positions related to the current year	4,793	4,440
Reductions for tax positions of prior years	(5,566)	(4,921)
Settlements	0	0
Balance at end of year	$ 45,337	$ 46,110

Equity-Based Compensation, Pr66

Equity-Based Compensation, Profit Sharing and Deferred Compensation Plans - Additional Information (Detail) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)compensation_plan$ / sharesshares	Dec. 31, 2016USD ($)shares	Dec. 31, 2015USD ($)shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation expense | $	$ 44,562	$ 43,598	$ 54,091
Tax benefit related to equity-based compensation costs | $	$ 17,100	$ 17,000	$ 19,700
Options exercised (in shares)	165,000	83,000	131,000
Combined plan contribution | $	$ 18,400	$ 16,700	$ 17,900
Shares contributed to the Employee Stock Ownership Plan (in Shares)	6,000	9,000
Number of deferred compensation plans | compensation_plan	2
Common stock, shares held in rabbi trust, shares (in shares)	108,640	108,640
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price | $ / shares	$ 0
Total unrecognized compensation cost for all outstanding Options and RSUs | $	$ 100,000
Weighted-average period over which the unrecognized compensation will be recorded	1 year 10 months 24 days
RSUs | 2010 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted share units grants during period	0
Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of years for options granted	10 years
Options | 2014 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted share units vesting period or option vesting period	4 years
Options issued under the plan (in Shares)	19,000
Options vesting rights	over four years in 25% increments beginning on December 31, 2016, or later based on the date of grant
Percentage of options vesting rights	25.00%
Options | 2010 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted share units vesting period or option vesting period	4 years
Options issued under the plan (in Shares)	11,000
Options vesting rights	over four years in 25% increments beginning on December 31, 2019
Percentage of options vesting rights	25.00%
Options | Option Grant Contingent upon Continued Employment or Service as a Director and Achievement of Performance Metric | 2014 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in Shares)	15,000
Options | Option Grant Solely Contingent upon Continued Employment or Continued Service as a Director | 2014 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in Shares)	4,000
Options | Options Granted in Current Year | 2014 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options vesting rights	Over four years in 25% increments beginning on December 31, 2019
Minimum | RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted share units vesting period or option vesting period	2 years
Minimum | Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted share units vesting period or option vesting period	3 years
Maximum | RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted share units vesting period or option vesting period	4 years
Maximum | Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted share units vesting period or option vesting period	6 years

Equity-Based Compensation, Pr67

Equity-Based Compensation, Profit Sharing and Deferred Compensation Plans - Summary of Equity-Based Compensation Plans with Grants Outstanding (Detail)	Dec. 31, 2017shares
1998 Management Long-Term Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Authorized	1,000,000
Options/RSUs Outstanding	6,000
Shares Available to Issue	0
2000 Broadly-Based Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Authorized	2,000,000
Options/RSUs Outstanding	89,000
Shares Available to Issue	0
2010 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Authorized	700,000
Options/RSUs Outstanding	218,000
Shares Available to Issue	38,000
2014 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Authorized	950,000
Options/RSUs Outstanding	613,000
Shares Available to Issue	276,000

Equity-Based Compensation, Pr68

Equity-Based Compensation, Profit Sharing and Deferred Compensation Plans - Summary of Equity-Based Compensation Plans with Grants Outstanding (Textual) (Detail) - shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding	916,000	1,076,000
2010 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized	700,000
Shares Available to Issue	38,000
2010 Equity Incentive Plan | RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized	240,000
Restricted share units outstanding	10,000	16,000
2010 Equity Incentive Plan | Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding	208,000
Restricted share units vesting period or option vesting period	4 years
2014 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized	950,000
Shares Available to Issue	276,000
2014 Plan | Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of options vesting rights	25.00%
Performance metric period	3 years
Restricted share units vesting period or option vesting period	4 years
2014 Plan | Options | Option Grant Solely Contingent upon Continued Employment or Continued Service as a Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of options vesting rights	50.00%
2014 Plan | Options | Option Grant Contingent upon Continued Employment or Service as a Director and Achievement of Performance Metric
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of options vesting rights	50.00%

Equity-Based Compensation, Pr69

Equity-Based Compensation, Profit Sharing and Deferred Compensation Plans - Equity-Based Compensation Plans (Detail) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)$ / sharesshares
Stock Options
Stock Option, Shares
Outstanding at beginning of period (Shares)	1,076,000
Granted (Shares)	30,000
Exercised (Shares)	(159,000)
Forfeited (Shares)	(31,000)
Outstanding at end of period (Shares)	916,000
Exercisable at end of period (Shares)	461,000
Weighted Average Per Share Exercise Price
Outstanding at beginning of period (Weighted Average Exercise Price) | $ / shares	$ 1,048.38
Granted (Weighted Average Exercise Price) | $ / shares	2,431.54
Exercised (Weighted Average Exercise Price) | $ / shares	886.41
Forfeited (Weighted Average Exercise Price) | $ / shares	1,099.68
Outstanding at end of period (Weighted Average Exercise Price) | $ / shares	1,119.92
Exercisable at end of period (Weighted Average Exercise Price) | $ / shares	$ 957.50
Remaining Contractual Life and Aggregate Intrinsic Value
Outstanding at end of period (Weighted Average Remaining Contract Life (Years)	6 years
Exercisable at end of period (Weighted Average Remaining Contract Life (Years)	5 years
Outstanding at end of period (Aggregate Intrinsic Value) | $	$ 2,187,430
Exercisable at end of period (Aggregate Intrinsic Value) | $	$ 1,176,843
2010 Equity Incentive Plan | Stock Options
Stock Option, Shares
Outstanding at end of period (Shares)	208,000
2010 Equity Incentive Plan | RSUs
RSU, Shares
Outstanding at beginning of period (Shares)	16,000
Granted (Shares)	0
Vested (Shares)	(6,000)
Forfeited (Shares)	0
Outstanding at end of period (Shares)	10,000
Vested, but not issued at end of period (Shares)	5,000
Remaining Contractual Life and Aggregate Intrinsic Value
Outstanding at end of period (Aggregate Intrinsic Value) | $	$ 34,945
Vested, but not issued at end of period (Aggregate Intrinsic Value) | $	$ 18,344

Equity-Based Compensation, Pr70

Equity-Based Compensation, Profit Sharing and Deferred Compensation Plans - Black-Scholes Option-Pricing Model Assumptions (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Estimated option life	5 years 3 months 4 days	5 years 3 months 7 days	5 years 2 months 1 day
Risk free interest rate (range), minimum	1.53%	0.86%	1.04%
Risk free interest rate (range), maximum	2.38%	2.21%	2.07%
Expected volatility (range), minimum	15.09%	15.91%	17.00%
Expected volatility (range), maximum	17.95%	23.49%	26.79%
Expected dividend rate	0.00%	0.00%	0.00%
Weighted average grant-date fair value per share of options granted	$ 494.17	$ 320.21	$ 296.50

Equity-Based Compensation, Pr71

Equity-Based Compensation, Profit Sharing and Deferred Compensation Plans - Exercised Option Proceeds (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Aggregate exercise proceeds	$ 140,525	$ 38,106	$ 85,948
Aggregate intrinsic value on exercise dates	$ 206,890	$ 96,600	$ 99,288

Commitments and Contingent Li72

Commitments and Contingent Liabilities - Future Minimum Lease Payments under Operating Leases (Detail) $ in Thousands	Dec. 31, 2017USD ($)
Commitments and Contingencies Disclosure [Abstract]
2,018	$ 29,366
2,019	21,569
2,020	17,799
2,021	13,436
2,022	10,780
Thereafter	17,202
Subtotal	110,152
Sublease income	(30)
Total minimum lease payments	$ 110,122

Commitments and Contingent Li73

Commitments and Contingent Liabilities - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)lotcontract	Dec. 31, 2016USD ($)lot	Dec. 31, 2015USD ($)
Commitments And Contingencies [Line Items]
Rent expense under operating leases	$ 49,400	$ 45,800	$ 48,100
Maximum range of deposits required under the purchase agreements	10.00%
Contingent forfeitable deposits with land developers	$ 137,900
Number of specific performance contracts | contract	1
Finished lots committed to purchase under specific performance obligations | lot	10	10
Purchase price of finished lots committed to purchase under specific performance obligations	$ 1,505	$ 1,505
Aggregate additional funding commitments related to raw land property development	7,900
Expected development credit offset amount	4,700
Contingent obligations under bonds or letters of credit arrangements	44,300
Credit Agreement
Commitments And Contingencies [Line Items]
Contingent obligations under letters of credit arrangements	$ 7,300

Commitments and Contingent Li74

Commitments and Contingent Liabilities - Summary of Changes in Product Warranty/Liability Reserve (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Movement in Warranty Reserve [Roll Forward]
Warranty reserve, beginning of year	$ 93,895	$ 87,407	$ 94,060
Provision	44,652	50,787	47,003
Payments	(44,034)	(44,299)	(53,656)
Warranty reserve, end of year	$ 94,513	$ 93,895	$ 87,407

Fair Value - Additional Informa

Fair Value - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fair value measurement gain/(loss)	$ 5,824	$ 4,186
Homebuilding:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior Notes	597,066	596,455
Homebuilding: | Senior Notes due 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior Notes	597,066	596,455
Homebuilding: | Level 2 | Fair Value, Measurements, Recurring | Senior Notes due 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior Notes fair value	630,000	612,000
Mortgage Banking:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of mortgage loans held for sale	352,489	351,958
Mortgage Banking: | Level 2 | Not Designated as Hedging Instrument
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value adjustment income (expense)	1,638	(3,147)	$ 3,508
Mortgage Banking: | Level 2 | Fair Value, Measurements, Recurring | Rate lock commitments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notional amount of contractual commitments	490,184
Total fair value measurement gain/(loss)	3,568
Mortgage Banking: | Level 2 | Fair Value, Measurements, Recurring | Forward sales contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notional amount of contractual commitments	705,405
Total fair value measurement gain/(loss)	325
Mortgage Banking: | Level 2 | Fair Value, Measurements, Recurring | Mortgages held for sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notional amount of contractual commitments	350,558	357,912
Fair value of mortgage loans held for sale	352,489	351,958
Total fair value measurement gain/(loss)	$ 1,931	$ (5,954)

Fair Value - Undesignated Deriv

Fair Value - Undesignated Derivative Instruments (Detail) - Mortgage Banking: - Level 2 - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Rate lock commitments
Derivatives, Fair Value [Line Items]
Gross assets	$ 5,400	$ 5,403
Gross liabilities	1,832	3,327
Net commitments	3,568	2,076
Forward sales contracts
Derivatives, Fair Value [Line Items]
Gross assets	992	9,148
Gross liabilities	667	1,084
Net commitments	$ 325	$ 8,064

Fair Value - Fair Value Measure

Fair Value - Fair Value Measurement (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assumed Gain/(Loss) From Loan Sale	$ (870)
Interest Rate Movement Effect	(2,133)
Servicing Rights Value	8,502
Security Price Change	325
Total Fair Value Measurement Gain/(Loss)	5,824	$ 4,186
Mortgage Banking: | Level 2 | Fair Value, Measurements, Recurring | Rate lock commitments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notional or Principal Amount	490,184
Assumed Gain/(Loss) From Loan Sale	(666)
Interest Rate Movement Effect	(407)
Servicing Rights Value	4,641
Security Price Change	0
Total Fair Value Measurement Gain/(Loss)	3,568
Mortgage Banking: | Level 2 | Fair Value, Measurements, Recurring | Forward sales contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notional or Principal Amount	705,405
Assumed Gain/(Loss) From Loan Sale	0
Interest Rate Movement Effect	0
Servicing Rights Value	0
Security Price Change	325
Total Fair Value Measurement Gain/(Loss)	325
Mortgage Banking: | Level 2 | Fair Value, Measurements, Recurring | Mortgages held for sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notional or Principal Amount	350,558	357,912
Assumed Gain/(Loss) From Loan Sale	(204)
Interest Rate Movement Effect	(1,726)
Servicing Rights Value	3,861
Security Price Change	0
Total Fair Value Measurement Gain/(Loss)	$ 1,931	$ (5,954)

Mortgage Loan Losses Allowance

Mortgage Loan Losses Allowance - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Mortgage Repurchase Reserve [Abstract]
Pre-tax charges for loan losses related to mortgage loans sold	$ 2,900	$ 2,000	$ 2,700
Mortgage repurchase reserve	$ 14,000	$ 12,700

Quarterly Results (unaudited) -

Quarterly Results (unaudited) - Quarterly Financial Data and Operating Information (Detail) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017USD ($)SettlementsBacklogorder$ / shares	Sep. 30, 2017USD ($)SettlementsBacklogorder$ / shares	Jun. 30, 2017USD ($)SettlementsBacklogorder$ / shares	Mar. 31, 2017USD ($)SettlementsBacklogorder$ / shares	Dec. 31, 2016USD ($)SettlementsBacklogorder$ / shares	Sep. 30, 2016USD ($)SettlementsBacklogorder$ / shares	Jun. 30, 2016USD ($)SettlementsBacklogorder$ / shares	Mar. 31, 2016USD ($)SettlementsBacklogorder$ / shares	Dec. 31, 2017USD ($)$ / shares	Dec. 31, 2016USD ($)$ / shares	Dec. 31, 2015USD ($)$ / shares
Quarterly Financial Information [Line Items]
Net income	$ 124,619	$ 162,102	$ 147,877	$ 102,923	$ 150,891	$ 117,392	$ 91,676	$ 65,303	$ 537,521	$ 425,262	$ 382,927
Diluted earnings per share (USD per share) | $ / shares	$ 28.88	$ 38.02	$ 35.19	$ 25.12	$ 37.80	$ 28.46	$ 22.01	$ 15.79	$ 126.77	$ 103.61	$ 89.99
New orders (units) | order	4,306	4,200	4,678	4,424	3,645	3,477	4,324	4,137
Settlements (units) | Settlements	4,630	4,158	3,917	3,256	4,419	3,922	3,581	3,006
Backlog, end of period (units) | Backlog	8,531	8,855	8,813	8,052	6,884	7,658	8,103	7,360
Loans closed	$ 1,229,695	$ 1,115,494	$ 1,041,613	$ 843,341	$ 1,201,164	$ 1,055,163	$ 942,407	$ 753,840
Homebuilding:
Quarterly Financial Information [Line Items]
Revenues – homebuilding operations	1,781,494	1,633,726	1,512,714	1,247,587	1,718,527	1,507,451	1,361,741	1,121,504	$ 6,175,521	$ 5,709,223	$ 5,065,200
Gross profit – homebuilding operations	343,187	325,755	294,631	221,570	305,087	265,159	235,372	195,744
Mortgage Banking:
Quarterly Financial Information [Line Items]
Mortgage banking fees	$ 34,842	$ 34,194	$ 31,778	$ 29,505	$ 34,239	$ 30,118	$ 26,442	$ 22,522	$ 130,319	$ 113,321	$ 93,808