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Variable Interest Entities ("VIEs") - Total Risk of Loss Related to Contract Land Deposits (Detail) $ in Thousands | Sep. 30, 2018 USD ($) lot | Dec. 31, 2017 USD ($) lot
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Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure [Abstract] |  |
Contract land deposits | $ 402,318 | $ 400,428
Loss reserve on contract land deposits | (27,968) | (29,999)
Contract land deposits, net | 374,350 | 370,429
Contingent obligations in the form of letters of credit | 3,870 | 1,996
Specific performance obligations | 1,505 | 1,505
Total risk of loss | $ 379,725 | $ 373,930
Finished lots committed to purchase under specific performance obligations | lot | 10 | 10

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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 Finished lots committed to purchase under specific performance obligations. + References No definition available. + Details
Name: | nvr_FinishedLotsCommittedToPurchase
Namespace Prefix: | nvr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Letters of credit related to contract land deposits. + References No definition available. + Details
Name: | nvr_LettersOfCreditRelatedToLots
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 Specific performance obligations. + References No definition available. + Details
Name: | nvr_SpecificPerformanceObligations
Namespace Prefix: | nvr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Carrying value of amounts transferred to third parties for security purposes that are expected to be returned or applied towards payment in the future. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DepositsAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=115931803&loc=d3e12069-110248 + Details
Name: | us-gaap_GuaranteeObligationsMaximumExposure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_VariableInterestEntityReportingEntityInvolvementMaximumLossExposureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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