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Commitments and Contingent Liabilities - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2018
Commitments And Contingencies [Line Items] |  |
Rent expense under operating leases |  | $ 52,900
Maximum range of deposits required under the purchase agreements | 10.00% |
Contingent forfeitable deposits with land developers | $ 215,000 |
Aggregate additional funding commitments related to raw land property development | 5,100 |
Expected development credit offset amount | 2,600 |
Contingent obligations under bonds or letters of credit arrangements | 40,600 |
Credit Agreement |  |
Commitments And Contingencies [Line Items] |  |
Contingent obligations under letters of credit arrangements | $ 12,800 |

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- Definition Aggregate additional funding commitments related to raw land property development. + References No definition available. + Details
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Namespace Prefix: | nvr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Commitments and contingencies. + References No definition available. + Details
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Namespace Prefix: | nvr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amounts represent required payments of forfeitable deposits with land developers under existing, fixed price purchase agreements, assuming that contractual development milestones are met by the developers. + References No definition available. + Details
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Namespace Prefix: | nvr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Contingent obligations under bond or letter of credit arrangements with local municipalities, government agencies, or land developers + References No definition available. + Details
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Namespace Prefix: | nvr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Expected Development Credit Offset Amount + References No definition available. + Details
Name: | nvr_ExpectedDevelopmentCreditOffsetAmount
Namespace Prefix: | nvr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Maximum percentage of deposits required under the purchase agreements. + References No definition available. + Details
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Namespace Prefix: | nvr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121573735&loc=d3e41499-112717 + Details
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- Details
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Namespace Prefix: |
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Period Type: |