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Joint Ventures - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 Lot JointVenture	Dec. 31, 2012	Dec. 31, 2014 Lot JointVenture
Joint Ventures [Line Items]
Investment in and advances to unconsolidated joint ventures	$ 22,850us-gaap_PaymentsToAcquireInterestInJointVenture	$ 1,000us-gaap_PaymentsToAcquireInterestInJointVenture
Aggregate investment	92,700us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures		82,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
Expected production of finished lots	9,300nvr_ExpectedProductionOfFinishedLotsFromJointVentures		8,800nvr_ExpectedProductionOfFinishedLotsFromJointVentures
Total lots not under contract with NVR under the joint venture	3,400nvr_JointVentureLotsNotUnderContractWithCompany		3,300nvr_JointVentureLotsNotUnderContractWithCompany
Number of joint ventures	4nvr_NumberOfJointVentures		5nvr_NumberOfJointVentures
Additional funding commitments in the aggregate	11,850nvr_AggregateAdditionalFundingCommitments		11,850nvr_AggregateAdditionalFundingCommitments
Number of joint ventures NVR is not primary beneficiary			4nvr_NumberOfJointVenturesCompanyIsNotPrimaryBeneficiary
Number of joint ventures with additional funding commitment	2nvr_NumberJointVenturesWithAdditionalFundingCommitment		2nvr_NumberJointVenturesWithAdditionalFundingCommitment
New Joint Venture Unrelated Partner [Member]
Joint Ventures [Line Items]
Investment in and advances to unconsolidated joint ventures	11,850us-gaap_PaymentsToAcquireInterestInJointVenture / dei_LegalEntityAxis = nvr_UnrelatedNewJointVenturePartnerMember
Expected production of finished lots	1,300nvr_ExpectedProductionOfFinishedLotsFromJointVentures / dei_LegalEntityAxis = nvr_UnrelatedNewJointVenturePartnerMember
Lots being sold to the Company	50.00%nvr_PercentageJointVentureLotsPurchasedByCompany / dei_LegalEntityAxis = nvr_UnrelatedNewJointVenturePartnerMember
Other Assets [Member]
Joint Ventures [Line Items]
Investment in and advances to unconsolidated joint ventures	11,000us-gaap_PaymentsToAcquireInterestInJointVenture / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember
Aggregate investment	$ 90,500us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember		$ 80,100us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember

X

- Definition

Aggregate additional funding commitments.

+ References

No definition available.

+ Details

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Namespace Prefix:	nvr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Expected production of finished lots from joint ventures.

+ References

No definition available.

+ Details

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Namespace Prefix:	nvr_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Lots not under contract with the Company held under the joint venture at a geographic location.

+ References

No definition available.

+ Details

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Namespace Prefix:	nvr_
Data Type:	xbrli:integerItemType
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X

- Details

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X

- Definition

The number of joint ventures to which NVR has an additional funding commitment.

+ References

No definition available.

+ Details

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Namespace Prefix:	nvr_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number of joint ventures.

+ References

No definition available.

+ Details

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Namespace Prefix:	nvr_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number of joint ventures the Company is deemed not the primary beneficiary.

+ References

No definition available.

+ Details

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Namespace Prefix:	nvr_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Percentage of the joint venture lots to purchased by the company.

+ References

No definition available.

+ Details

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

X

- Definition

Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership.

+ 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 210.5-02.12)

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

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

The cash outflow associated with the investment in or advances to an entity in which the reporting entity shares control of the entity with another party or group.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

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- Details

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- Details

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