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Variable Interest Entities - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 6 Months Ended
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Jun. 30, 2014
Variable Interest Entity [Line Items] |
Maximum range of deposits required under the purchase agreements | 10.00%
Power of developer's equity holders to direct operating activities of the development entity | 100.00%
Lots controlled by NVR | 60,900
Contract land deposits in cash | $ 306,200
Letters of credit related to lots | 2,400
Contract with Land Owners [Member] |
Variable Interest Entity [Line Items] |
Lots controlled by NVR | 4,900
Contract land deposits | 3,500
Letters of credit related to land contract | 4,000
Refundable deposits and letters of credit | $ 7,300
Development Entities [Member] |
Variable Interest Entity [Line Items] |
Voting rights description | NVR has no voting rights in any of the development entities

X
- 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