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v3.20.4

Leases (Details) $ in Thousands | Dec. 31, 2020 USD ($)
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Operating Lease Member [Member] |
Lessee, Lease, Description [Line Items] |
Short-term Lease Commitment, Amount | $ 6,765
Finance Leases Member [Member] |
Lessee, Lease, Description [Line Items] |
Short-term Lease Commitment, Amount | $ 0

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

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- Definition Amount of short-term lease commitment. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918705-209980 + Details
Name: | us-gaap_ShortTermLeaseCommitmentAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_LeaseContractualTermAxis=nvr_OperatingLeasesMemberMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LeaseContractualTermAxis=nvr_FinanceLeasesMemberMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |