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Commitments and Contingent Liabilities - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 Contract Lot | Dec. 31, 2013 Lot | Dec. 31, 2012
Commitments And Contingencies Disclosure [Abstract] |  |  |
Rent expense under operating leases | $ 45,508 us-gaap_OperatingLeasesRentExpenseNet | $ 39,608 us-gaap_OperatingLeasesRentExpenseNet | $ 33,399 us-gaap_OperatingLeasesRentExpenseNet
Maximum range of deposits required under the purchase agreements | 10.00%nvr_MaximumPercentageOfDepositsRequiredUnderPurchaseAgreements |  |
Term of business plan | 5 years |  |
Contingent forfeitable deposits with land developers | 75,200 nvr_ContingentForfeitableDepositsWithLandDevelopers |  |
Number of specific performance contracts | 1 nvr_NumberOfSpecificPerformanceContracts |  |
Finished lots committed to purchase under specific performance obligations | 10 nvr_FinishedLotsCommittedToPurchase | 13 nvr_FinishedLotsCommittedToPurchase |
Purchase price of finished lots committed to purchase under specific performance obligations | 1,500 nvr_PurchasePriceOfFinishedLotsCommittedToPurchase |  |
Contingent obligations under bonds or letters of credit arrangements | 59,400 nvr_ContingentObligationsUnderBondOrLetterOfCreditArrangements |  |
Contingent obligations under letters of credit arrangements | 11,400 us-gaap_LettersOfCreditOutstandingAmount |  |
Warranty reserve provision including accrual charges |  | 31,600 nvr_CostsAccruedForWarrantyContractsRelatedToWaterInfiltrationAndNonrecurringServiceIssues |
Warranty accrual related to a single completed community |  | 15,600 nvr_CostsAccruedForWarrantyContractsRelatedToWaterInfiltrationIssues |
Warranty accrual for a non-recurring service issue |  | $ 16,000 nvr_CostsAccruedForWarrantyContractsRelatedToNonrecurringServiceIssues |

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- Definition Amounts represent required payments of forfeitable deposits with land developers under existing, fixed price purchase agreements, assuming that contractual development milestones are met by the developers. + References No definition available. + Details
Name: | nvr_ContingentForfeitableDepositsWithLandDevelopers
Namespace Prefix: | nvr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Contingent obligations under bond or letter of credit arrangements with local municipalities, government agencies, or land developers + References No definition available. + Details
Name: | nvr_ContingentObligationsUnderBondOrLetterOfCreditArrangements
Namespace Prefix: | nvr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Costs accrued for warranty contracts related to nonrecurring service issues. + References No definition available. + Details
Name: | nvr_CostsAccruedForWarrantyContractsRelatedToNonrecurringServiceIssues
Namespace Prefix: | nvr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Costs accrued for warranty contracts related to water infiltration and nonrecurring service issues. + References No definition available. + Details
Name: | nvr_CostsAccruedForWarrantyContractsRelatedToWaterInfiltrationAndNonrecurringServiceIssues
Namespace Prefix: | nvr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Costs accrued for warranty contracts related to water infiltration issues. + References No definition available. + Details
Name: | nvr_CostsAccruedForWarrantyContractsRelatedToWaterInfiltrationIssues
Namespace Prefix: | nvr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Finished lots committed to purchase under specific performance obligations. + References No definition available. + Details
Name: | nvr_FinishedLotsCommittedToPurchase
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

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- Definition Number of specific performance contracts. + References No definition available. + Details
Name: | nvr_NumberOfSpecificPerformanceContracts
Namespace Prefix: | nvr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Purchase price of finished lots committed to purchase. + References No definition available. + Details
Name: | nvr_PurchasePriceOfFinishedLotsCommittedToPurchase
Namespace Prefix: | nvr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Term of business plan. + References No definition available. + Details
Name: | nvr_TermOfBusinessPlan
Namespace Prefix: | nvr_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
Name: | us-gaap_OperatingLeasesRentExpenseNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration