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Variable Interest Entities - Additional Information (Detail) $ in Thousands | Dec. 31, 2017 USD ($) lot | Dec. 31, 2016 USD ($)
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Variable Interest Entity [Line Items] |  |
Maximum range of deposits required under the purchase agreements | 10.00% |
Contract land deposits in cash | $ 400,428 | $ 411,150
Variable Interest Entities |  |
Variable Interest Entity [Line Items] |  |
Maximum range of deposits required under the purchase agreements | 10.00% |
Lots controlled by NVR | lot | 84,300 |
Contract land deposits in cash under Lot Purchase Agreements | $ 393,900 |
Letters of credit related to lots | $ 1,900 |
Contract on Raw Ground with Landowners |  |
Variable Interest Entity [Line Items] |  |
Lots controlled by NVR | lot | 10,700 |
Contract land deposits in cash | $ 6,600 |
Letters of credit on raw land contracts | 100 |
Refundable deposits | $ 5,800 |

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

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

X
- Definition Letters Of Credit 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 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 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
Name: | us-gaap_VariableInterestEntityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis=us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis=nvr_RawGroundContractsVariableInterestEntityNotPrimaryBeneficiaryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |