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Variable Interest Entities - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014
Variable Interest Entity [Line Items] |
Maximum range of deposits required under the purchase agreements | 10.00%nvr_MaximumPercentageOfDepositsRequiredUnderPurchaseAgreements
Power of developer's equity holders to direct operating activities of the development entity | 100.00%nvr_PowerOfDevelopersEquityHoldersToDirectOperatingActivitiesOfDevelopmentEntity
Lots controlled by NVR | 62,800 nvr_LotsControlledByCompany
Contract land deposits in cash | 348,400 nvr_ContractLandDepositsOnFixedPricePurchaseAgreements
Letters of credit related to lots | 1,700 nvr_LetterOfCreditOnFixedPricePurchaseAgreements
Development Entities [Member] |
Variable Interest Entity [Line Items] |
Voting rights description | NVR has no voting rights in any of the development entities
Contract on Raw Ground with Land Owners [Member] |
Variable Interest Entity [Line Items] |
Lots controlled by NVR | 5,700 nvr_LotsControlledByCompany / dei_LegalEntityAxis = nvr_LandownerMember
Contract land deposits | 2,300 nvr_ContractLandDepositsOnRawLandContracts / dei_LegalEntityAxis = nvr_LandownerMember
Letters of credit related to land contract | 3,000 nvr_LettersOfCreditOnRawLandContracts / dei_LegalEntityAxis = nvr_LandownerMember
Refundable deposits and letters of credit | 2,600 nvr_RefundableDeposits / dei_LegalEntityAxis = nvr_LandownerMember

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- Definition The gross amount as of the balance sheet date of deposits paid to secure the right to purchase finished lots under fixed price purchase agreements. + References No definition available. + Details
Name: | nvr_ContractLandDepositsOnFixedPricePurchaseAgreements
Namespace Prefix: | nvr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The gross amount as of the balance sheet date of deposits paid to secure the right to purchase finished lots under raw land contracts. + References No definition available. + Details
Name: | nvr_ContractLandDepositsOnRawLandContracts
Namespace Prefix: | nvr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Letter of credit on fixed price purchase agreements. + References No definition available. + Details
Name: | nvr_LetterOfCreditOnFixedPricePurchaseAgreements
Namespace Prefix: | nvr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Letters of credit issued for deposits on raw land contracts. + References No definition available. + Details
Name: | nvr_LettersOfCreditOnRawLandContracts
Namespace Prefix: | nvr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Lots controlled by NVR. + References No definition available. + Details
Name: | nvr_LotsControlledByCompany
Namespace Prefix: | nvr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- 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

X
- Definition Power of developer's equity holders to direct operating activities of the development entity. + References No definition available. + Details
Name: | nvr_PowerOfDevelopersEquityHoldersToDirectOperatingActivitiesOfDevelopmentEntity
Namespace Prefix: | nvr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Portion of deposits and letters of credit made on raw land contracts which may be refundable. + References No definition available. + Details
Name: | nvr_RefundableDeposits
Namespace Prefix: | nvr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Voting rights description. + References No definition available. + Details
Name: | nvr_VotingRightsDescription
Namespace Prefix: | nvr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

X
- Details
Name: | dei_LegalEntityAxis=nvr_DevelopmentEntitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=nvr_LandownerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |