Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

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Cash related to consolidated joint venture.

+ References

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- Definition

The recovery of contract land deposits previously determined to be uncollectible.

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No definition available.

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- Definition

Period of time originated loans are held before being sold into the secondary market.

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The more-likely-than-not threshold for the recognition of a tax benefit from an uncertain tax position.

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Valuation allowance of contract land deposit assets.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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No definition available.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Significant Accounting Policies [Line Items]
Cash related to a consolidated variable interest entity	$ 481	$ 668
Pre-tax recovery related to impairment of contract land deposits	225nvr_ContractLandDepositAssetRecovery	5,300nvr_ContractLandDepositAssetRecovery	2,000nvr_ContractLandDepositAssetRecovery
Contract land deposit asset impairment valuation allowance	56,100	59,800
Uncertain tax position threshold for tax benefit	50.00%nvr_TaxBenefitFromUncertainTax
Model Home Furniture and Fixtures [Member]
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	2 years
Office Facilities and Other [Member] \| Minimum [Member]
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Office Facilities and Other [Member] \| Maximum [Member]
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	10 years
Manufacturing Facilities [Member] \| Minimum [Member]
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Manufacturing Facilities [Member] \| Maximum [Member]
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	40 years
Homebuilding [Member]
Significant Accounting Policies [Line Items]
Restricted cash	24,106	20,563
Impairment of goodwill	0
Homebuilding [Member] \| Heartland Homes Inc [Member]
Significant Accounting Policies [Line Items]
Goodwill acquired from business acquisition	441
Finite-lived intangibles acquired from business acquisition, net of accumulated amortization	4,923	6,306
Weighted average life of finite-lived intangible assets	4 years
Mortgage Banking [Member]
Significant Accounting Policies [Line Items]
Restricted cash	1,947	2,860
Mortgage Banking [Member] \| Level 2 [Member] \| Fair Value, Measurements, Recurring [Member]
Significant Accounting Policies [Line Items]
Typical length of days loans sold into secondary market	30 days
Mortgage Banking [Member] \| Level 2 [Member] \| Fair Value, Measurements, Recurring [Member] \| Rate Lock Commitments [Member]
Significant Accounting Policies [Line Items]
Notional or Principal Amount	237,989
Mortgage Banking [Member] \| Level 2 [Member] \| Fair Value, Measurements, Recurring [Member] \| Forward Sales Contracts [Member]
Significant Accounting Policies [Line Items]
Notional or Principal Amount	$ 424,966