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Debt - Summary of Debt (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	0 Months Ended		12 Months Ended
	Jul. 30, 2014	Sep. 10, 2012	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Lease expiration date			2014-03
Capital lease obligations fixed interest rate			13.00%nvr_CapitalLeaseObligationFixedInterestRate
Debt issuance date		Sep. 10, 2012
Senior notes principal amount		$ 600,000us-gaap_DebtInstrumentFaceAmount
Senior notes maturity		Sep. 15, 2022
Senior notes effective interest rate			3.97%us-gaap_DebtInstrumentInterestRateEffectivePercentage
Senior notes proceeds		593,900us-gaap_ProceedsFromDebtNetOfIssuanceCosts
Senior notes interest rate		3.95%us-gaap_DebtInstrumentInterestRateStatedPercentage
Frequency of Senior Notes payment			Semi-annually in arrears on March 15 and September 15
Repurchase agreement maximum loan borrowing capacity			25,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
Expiration date of Repurchase Agreement	Jul. 29, 2015
Property under Capital Leases [Member]
Debt Instrument [Line Items]
Property, plant and equipment, net				$ 47us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_AssetsHeldUnderCapitalLeasesMember

X

- Definition

Fixed interest rate for capital lease obligation.

+ References

No definition available.

+ Details

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Namespace Prefix:	nvr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Expiration date of repurchase agreement.

+ References

No definition available.

+ Details

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Namespace Prefix:	nvr_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Lease expiration month year.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

X

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399



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Balance Type:	credit
Period Type:	instant

X

- Definition

Description of the frequency of periodic payments (monthly, quarterly, annual).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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-Publisher SEC

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-Number 210

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-Topic 942

-SubTopic 470

-Section 50

-Paragraph 3

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

+ Details

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X

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

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X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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-Number 210

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Data Type:	num:percentItemType
Balance Type:	na
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X

- Definition

Date the debt instrument was issued, in CCYY-MM-DD format.

+ References

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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- Details

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Data Type:	xbrli:stringItemType
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X

- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Balance Type:	na
Period Type:	duration

X

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

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Balance Type:	credit
Period Type:	instant

X

- Definition

The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Period Type:	duration

X

- Definition

Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

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