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Related Party Transactions - Additional Information (Detail) (Elm Street [Member], USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 Lot | Dec. 31, 2013 | Dec. 31, 2012
Elm Street [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Related party forward lot purchase agreement purchase price | $ 40,800 nvr_RelatedPartyFixedPricePurchaseAgreementPurchasePrice / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = nvr_ElmStreetMember |  |
Number of related parties for forward lot purchase agreement | 1 nvr_NumberOfRelatedPartiesForForwardLotPurchaseAgreement / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = nvr_ElmStreetMember |  |
Market price of developed lots | 50,100 us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = nvr_ElmStreetMember | 38,400 us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = nvr_ElmStreetMember | 54,600 us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = nvr_ElmStreetMember
Expected number of lots from joint venture with Elm Street | 2,400 nvr_ExpectedYieldOfRelatedPartyLots / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = nvr_ElmStreetMember |  |
Development costs to manage property under related party transactions | $ 143 nvr_ManagementFeePaidToRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = nvr_ElmStreetMember | $ 143 nvr_ManagementFeePaidToRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = nvr_ElmStreetMember | $ 143 nvr_ManagementFeePaidToRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = nvr_ElmStreetMember

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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 Management fee paid to related party for property development. + References No definition available. + Details
Name: | nvr_ManagementFeePaidToRelatedParty
Namespace Prefix: | nvr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- 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

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- Definition Fixed price purchase agreements entered into with related party. + References No definition available. + Details
Name: | nvr_RelatedPartyFixedPricePurchaseAgreementPurchasePrice
Namespace Prefix: | nvr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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- Definition Purchases during the period (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration