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

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- Definition Aggregate additional funding commitments. + References No definition available. + Details
Name: | nvr_AggregateAdditionalFundingCommitments
Namespace Prefix: | nvr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Expected production of finished lots from joint ventures. + References No definition available. + Details
Name: | nvr_ExpectedProductionOfFinishedLotsFromJointVentures
Namespace Prefix: | nvr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Lots not under contract with the Company held under the joint venture at a geographic location. + References No definition available. + Details
Name: | nvr_JointVentureLotsNotUnderContractWithCompany
Namespace Prefix: | nvr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | nvr_JointVenturesLineItems
Namespace Prefix: | nvr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The number of joint ventures to which NVR has an additional funding commitment. + References No definition available. + Details
Name: | nvr_NumberJointVenturesWithAdditionalFundingCommitment
Namespace Prefix: | nvr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Number of joint ventures. + References No definition available. + Details
Name: | nvr_NumberOfJointVentures
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
Name: | nvr_NumberOfJointVenturesCompanyIsNotPrimaryBeneficiary
Namespace Prefix: | nvr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- 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

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- 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
Name: | us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- 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 + Details
Name: | us-gaap_PaymentsToAcquireInterestInJointVenture
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | dei_LegalEntityAxis=nvr_UnrelatedNewJointVenturePartnerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_OtherAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |