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Related Party Transactions - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 Lot | Dec. 31, 2011 | Dec. 31, 2010 Lot
Related party forward lot purchase agreement purchase price | $ 49,000 |  |
Number of related parties for forward lot purchase agreement | 1 |  |
Market price of developed lots | 54,600 | 36,100 | 54,600
Expected yield of related party lots | 1,500 |  |
Finished lots expected under related party transactions |  |  | 600
Cost basis of related party parcel |  |  | 49,000
Cost basis of related party parcel including development costs | 48,000 |  |
Development costs to manage property under related party transactions | $ 143 | $ 143 | $ 36

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- Definition Cost basis of related party parcel of land. + References No definition available. + Details
Name: | nvr_CostBasisOfRelatedPartyParcel
Namespace Prefix: | nvr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Cost basis of related party parcel of land, including development costs. + References No definition available. + Details
Name: | nvr_CostBasisOfRelatedPartyParcelIncludingDevelopmentCosts
Namespace Prefix: | nvr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Development costs paid to manage property of the related party transaction. + References No definition available. + Details
Name: | nvr_DevelopmentCostsForRelatedPartyTransaction
Namespace Prefix: | nvr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Expected yield of finished lots with remaining land of related party. + References No definition available. + Details
Name: | nvr_ExpectedYieldOfRelatedPartyLots
Namespace Prefix: | nvr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of finished lots expected to be produced through a related party purchase of zoned, unimproved raw parcel of land. + References No definition available. + Details
Name: | nvr_FinishedLotsExpectedUnderRelatedPartyTransaction
Namespace Prefix: | nvr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Market price of developed lots purchased by NVR. + References No definition available. + Details
Name: | nvr_MarketPriceOfDevelopedLots
Namespace Prefix: | nvr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Number of related parties for forward lot purchase agreement. + References No definition available. + Details
Name: | nvr_NumberOfRelatedPartiesForForwardLotPurchaseAgreement
Namespace Prefix: | nvr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Purchase price of forward lot purchase agreement with related party. + References No definition available. + Details
Name: | nvr_RelatedPartyForwardLotPurchaseAgreementPurchasePrice
Namespace Prefix: | nvr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration