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Related Party Transactions - Additional Information (Detail) - Elm Street | 12 Months Ended
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Dec. 31, 2017 USD ($) lot | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Related Party Transaction [Line Items] |  |  |
Related party forward lot purchase agreements purchase price | $ 66,600,000 |  |
Number of related parties for forward lot purchase agreement | lot | 1 |  |
Market price of developed lots | $ 37,100,000 | $ 44,500,000 | $ 41,200,000
Expected number of lots from joint venture with Elm Street | lot | 2,400 |  |
Additional funding to joint venture by NVR and Elm Street | $ 2,900,000 |  |
Development costs to manage property under related party transactions | $ 0 | $ 143,000 | $ 143,000

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- Definition Additional Funding To Joint Venture + References No definition available. + Details
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Namespace Prefix: | nvr_
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Balance Type: | credit
Period Type: | instant

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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
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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 Related party lot purchase agreements purchase price. + References No definition available. + Details
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Namespace Prefix: | nvr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |