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Variable Interest Entities and Joint Ventures - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 Joint_Ventures Lot | Dec. 31, 2011 Joint_Ventures
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Variable Interest Entity [Line Items] |  |
Maximum range of deposits required under the purchase agreements | 10.00% |
Power of developer's equity holders to direct operating activities of the development entity | 100.00% |
Lots controlled by NVR | 53,200 |
Cash deposited related to lots | $ 256,600 |
Letters of credit related to lots | 3,300 |
Aggregate investment | 82,900 | 89,500
Number of joint ventures NVR is not primary beneficiary | 3 |
Expected production of finished lots | 7,400 |
Additional funding commitments in the aggregate | 5,000 | 5,000
Number of joint ventures | 4 | 4
Finished lots expected under joint ventures |  | 6700
Other assets [Member] |  |
Variable Interest Entity [Line Items] |  |
Aggregate investment | $ 74,000 |
Number of joint ventures NVR is not primary beneficiary | 3 |
Not under contract with NVR [Member] |  |
Variable Interest Entity [Line Items] |  |
Total lots not under contract with NVR under the joint venture | 2,800 |

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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

X
- Definition Cash deposited related to lots. + References No definition available. + Details
Name: | nvr_CashDepositedRelatedToLots
Namespace Prefix: | nvr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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 Number of finished lots expected to be produced by unconsolidated joint ventures. + References No definition available. + Details
Name: | nvr_FinishedLotsExpectedUnderJointVentureInvestment
Namespace Prefix: | nvr_
Data Type: | xbrli:stringItemType
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

X
- Definition Letters of credit related to lots. + References No definition available. + Details
Name: | nvr_LettersOfCreditRelatedToLots
Namespace Prefix: | nvr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Lots controlled by NVR. + References No definition available. + Details
Name: | nvr_LotsControlledByCompany
Namespace Prefix: | nvr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Maximum percentage of deposits required under the purchase agreements. + References No definition available. + Details
Name: | nvr_MaximumPercentageOfDepositsRequiredUnderPurchaseAgreements
Namespace Prefix: | nvr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- 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

X
- Definition Power of developer's equity holders to direct operating activities of the development entity. + References No definition available. + Details
Name: | nvr_PowerOfDevelopersEquityHoldersToDirectOperatingActivitiesOfDevelopmentEntity
Namespace Prefix: | nvr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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

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- Details
Name: | us-gaap_VariableInterestEntityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration