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v3.21.2

Variable Interest Entities ("VIEs") - Additional Information (Detail) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 USD ($) lot | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) lot | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Variable Interest Entity [Line Items] |  |  |  |  |
Contract land deposit reserve adjustment | $ 4,100 | $ (4,800) | $ 17,500 | $ 32,500 |
Loss reserve on contract land deposits | 34,704 |  | 34,704 |  | $ 52,205
Contract land deposits in cash | $ 487,959 |  | $ 487,959 |  | $ 439,833
Variable Interest Entities |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Maximum range of deposits required under the purchase agreements | 10.00% |  | 10.00% |  |
Lots controlled by NVR | lot | 116,550 |  | 116,550 |  |
Contract land deposits in cash under lot purchase Agreements | $ 483,600 |  | $ 483,600 |  |
Letters of credit related to lots | $ 10,700 |  | $ 10,700 |  |
Contract on Raw Ground with Landowners |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Lots controlled by NVR | lot | 12,500 |  | 12,500 |  |
Contract land deposits in cash | $ 4,400 |  | $ 4,400 |  |
Letters of credit related to land contract | 100 |  | 100 |  |
Refundable deposits and letters of credit | $ 3,300 |  | $ 3,300 |  |

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- Definition Contract land deposit reserve adjustment. + References No definition available. + Details
Name: | nvr_ContractLandDepositReserveAdjustment
Namespace Prefix: | nvr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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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. + References No definition available. + Details
Name: | nvr_ContractLandDeposits
Namespace Prefix: | nvr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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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 lot purchase agreements. + References No definition available. + Details
Name: | nvr_ContractLandDepositsOnLotPurchaseAgreements
Namespace Prefix: | nvr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- 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

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- 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

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- Definition The reserve account established to account for expected but unspecified losses related to contract land deposits. + References No definition available. + Details
Name: | nvr_LossReserveOnContractLandDeposits
Namespace Prefix: | nvr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- 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

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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: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- 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

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

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

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