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v3.20.2

Variable Interest Entities ("VIEs") - Additional Information (Detail) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 USD ($) lot | Mar. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) lot | Dec. 31, 2019 USD ($)
Variable Interest Entity [Line Items] |  |  |  |
Contract land deposits in cash | $ 435,886 |  | $ 435,886 | $ 441,423
Contract land deposit reserve adjustment | (4,800) | $ 36,400 | 32,500 |
Loss Reserve On Contract Land Deposits | $ 58,781 |  | $ 58,781 | $ 27,572
Variable Interest Entities [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Maximum range of deposits required under the purchase agreements | 10.00% |  | 10.00% |
Power of developers equity holders to direct operating activities of development entity | 100.00% |  | 100.00% |
Lots controlled by NVR | lot | 100,000 |  | 100,000 |
Contract land deposits in cash under lot purchase Agreements | $ 434,200 |  | $ 434,200 |
Letters of credit related to lots | $ 6,800 |  | $ 6,800 |
Contract on Raw Ground with Landowners [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Lots controlled by NVR | lot | 6,300 |  | 6,300 |
Contract land deposits in cash | $ 1,700 |  | $ 1,700 |
Letters of credit related to land contract | 100 |  | 100 |
Refundable deposits and letters of credit | $ 1,100 |  | $ 1,100 |

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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: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- 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

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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: | srt_ConsolidatedEntitiesAxis=us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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