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Land Under Development - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 Lot Parcels | Mar. 31, 2014 Lot
Real Estate [Abstract] |  |
Number of raw parcels of land acquired | 4 nvr_NumberOfRawParcelsOfLandAcquired |
Carrying value of raw parcels of land | $ 35,813 us-gaap_InventoryRealEstateLandAndLandDevelopmentCosts |
Number of finished lots intended to be developed from raw parcels of land | 460 nvr_NumberOfFinishedLotsIntendedToBeDevelopedFromRawParcelsOfLand |
Finished lots under lot purchase agreements | 90 nvr_AggregateFinishedLotsUnderContractToBeSoldToUnrelatedPartyUnderAgreement |
Lots sold to unrelated party | 5 nvr_FinishedLotsSoldUnderContractToUnrelatedParty | 0 nvr_FinishedLotsSoldUnderContractToUnrelatedParty
Aggregate sales price of finished lots to unrelated party | $ 1,300 nvr_AmountOfFinishedLotsSoldUnderContractToUnrelatedParty |

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- Definition Aggregate finished lots under contract to be sold to unrelated party under agreement. + References No definition available. + Details
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Namespace Prefix: | nvr_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

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- Definition Amount of finished lots sold under contract to an unrelated party. + References No definition available. + Details
Name: | nvr_AmountOfFinishedLotsSoldUnderContractToUnrelatedParty
Namespace Prefix: | nvr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Finished lots sold under contract to an unrelated party. + References No definition available. + Details
Name: | nvr_FinishedLotsSoldUnderContractToUnrelatedParty
Namespace Prefix: | nvr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of finished lots intended to be developed from raw parcels of land for use in homebuilding operation. + References No definition available. + Details
Name: | nvr_NumberOfFinishedLotsIntendedToBeDevelopedFromRawParcelsOfLand
Namespace Prefix: | nvr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of raw parcels of land acquired. + References No definition available. + Details
Name: | nvr_NumberOfRawParcelsOfLandAcquired
Namespace Prefix: | nvr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Carrying amount as of the balance sheet date, net of valuation allowances and impairment losses, of costs of land expected to be developed in the near term plus capitalized costs of development, for purposes of selling completed units to home buyers or commercial or industrial entities.. + 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 210.5-02.6(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 6 -Subparagraph a -Article 5 + Details
Name: | us-gaap_InventoryRealEstateLandAndLandDevelopmentCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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