<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.25.4</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>197</ContextCount>
  <ElementCount>391</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>52</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>10</UnitCount>
  <MyReports>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>0000001 - Document - Cover</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/Cover</Role>
      <ShortName>Cover</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>0000002 - Document - Audit Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/AuditInformation</Role>
      <ShortName>Audit Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>9952151 - Statement - Consolidated Balance Sheets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/ConsolidatedBalanceSheets</Role>
      <ShortName>Consolidated Balance Sheets</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>9952152 - Statement - Consolidated Balance Sheets (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/ConsolidatedBalanceSheetsParenthetical</Role>
      <ShortName>Consolidated Balance Sheets (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>9952153 - Statement - Consolidated Statements of Income</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/ConsolidatedStatementsofIncome</Role>
      <ShortName>Consolidated Statements of Income</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>9952154 - Statement - Consolidated Statements of Shareholders' Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/ConsolidatedStatementsofShareholdersEquity</Role>
      <ShortName>Consolidated Statements of Shareholders' Equity</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>9952155 - Statement - Consolidated Statements of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/ConsolidatedStatementsofCashFlows</Role>
      <ShortName>Consolidated Statements of Cash Flows</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>9952156 - Disclosure - Summary of Significant Accounting Policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/SummaryofSignificantAccountingPolicies</Role>
      <ShortName>Summary of Significant Accounting Policies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>9952157 - Disclosure - Segment Information, Nature of Operations, and Certain Concentrations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/SegmentInformationNatureofOperationsandCertainConcentrations</Role>
      <ShortName>Segment Information, Nature of Operations, and Certain Concentrations</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>9952158 - Disclosure - Variable Interest Entities ("VIE's")</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/VariableInterestEntitiesVIEs</Role>
      <ShortName>Variable Interest Entities ("VIE's")</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>9952159 - Disclosure - Joint Ventures</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/JointVentures</Role>
      <ShortName>Joint Ventures</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>9952160 - Disclosure - Land Under Development</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/LandUnderDevelopment</Role>
      <ShortName>Land Under Development</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>9952161 - Disclosure - Property, Plant and Equipment ("PP&amp;E")</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/PropertyPlantandEquipmentPPE</Role>
      <ShortName>Property, Plant and Equipment ("PP&amp;E")</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>9952162 - Disclosure - Debt</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/Debt</Role>
      <ShortName>Debt</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>9952163 - Disclosure - Common Stock</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/CommonStock</Role>
      <ShortName>Common Stock</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>9952164 - Disclosure - Income Taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/IncomeTaxes</Role>
      <ShortName>Income Taxes</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>9952165 - Disclosure - Equity-Based Compensation, Profit Sharing and Deferred Compensation Plans</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/EquityBasedCompensationProfitSharingandDeferredCompensationPlans</Role>
      <ShortName>Equity-Based Compensation, Profit Sharing and Deferred Compensation Plans</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>9952166 - Disclosure - Leases, Codification Topic 842</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/LeasesCodificationTopic842</Role>
      <ShortName>Leases, Codification Topic 842</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>9952167 - Disclosure - Commitments and Contingent Liabilities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/CommitmentsandContingentLiabilities</Role>
      <ShortName>Commitments and Contingent Liabilities</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>9952168 - Disclosure - Fair Value</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/FairValue</Role>
      <ShortName>Fair Value</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>995445 - Disclosure - Insider Trading Arrangements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements</Role>
      <ShortName>Insider Trading Arrangements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>995447 - Disclosure - Insider Trading Policies and Procedures</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/ecd/role/InsiderTradingPoliciesProc</Role>
      <ShortName>Insider Trading Policies and Procedures</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>995550 - Disclosure - Cybersecurity Risk Management and Strategy Disclosure</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/cyd/role/CybersecurityRiskManagementAndStrategyDisclosure</Role>
      <ShortName>Cybersecurity Risk Management and Strategy Disclosure</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>9955511 - Disclosure - Summary of Significant Accounting Policies (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/SummaryofSignificantAccountingPoliciesPolicies</Role>
      <ShortName>Summary of Significant Accounting Policies (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://www.nvrinc.com/role/SummaryofSignificantAccountingPolicies</ParentRole>
      <Position>24</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>9955512 - Disclosure - Summary of Significant Accounting Policies (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/SummaryofSignificantAccountingPoliciesTables</Role>
      <ShortName>Summary of Significant Accounting Policies (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.nvrinc.com/role/SummaryofSignificantAccountingPolicies</ParentRole>
      <Position>25</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>9955513 - Disclosure - Segment Information, Nature of Operations, and Certain Concentrations (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/SegmentInformationNatureofOperationsandCertainConcentrationsTables</Role>
      <ShortName>Segment Information, Nature of Operations, and Certain Concentrations (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.nvrinc.com/role/SegmentInformationNatureofOperationsandCertainConcentrations</ParentRole>
      <Position>26</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>9955514 - Disclosure - Variable Interest Entities ("VIE's") (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/VariableInterestEntitiesVIEsTables</Role>
      <ShortName>Variable Interest Entities ("VIE's") (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.nvrinc.com/role/VariableInterestEntitiesVIEs</ParentRole>
      <Position>27</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>9955515 - Disclosure - Property, Plant and Equipment ("PP&amp;E") (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/PropertyPlantandEquipmentPPETables</Role>
      <ShortName>Property, Plant and Equipment ("PP&amp;E") (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.nvrinc.com/role/PropertyPlantandEquipmentPPE</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>9955516 - Disclosure - Common Stock (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/CommonStockTables</Role>
      <ShortName>Common Stock (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.nvrinc.com/role/CommonStock</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>9955517 - Disclosure - Income Taxes (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/IncomeTaxesTables</Role>
      <ShortName>Income Taxes (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.nvrinc.com/role/IncomeTaxes</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>9955518 - Disclosure - Equity-Based Compensation, Profit Sharing and Deferred Compensation Plans (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/EquityBasedCompensationProfitSharingandDeferredCompensationPlansTables</Role>
      <ShortName>Equity-Based Compensation, Profit Sharing and Deferred Compensation Plans (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.nvrinc.com/role/EquityBasedCompensationProfitSharingandDeferredCompensationPlans</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>9955519 - Disclosure - Leases, Codification Topic 842 (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/LeasesCodificationTopic842Tables</Role>
      <ShortName>Leases, Codification Topic 842 (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.nvrinc.com/role/LeasesCodificationTopic842</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>9955520 - Disclosure - Commitments and Contingent Liabilities (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/CommitmentsandContingentLiabilitiesTables</Role>
      <ShortName>Commitments and Contingent Liabilities (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.nvrinc.com/role/CommitmentsandContingentLiabilities</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>9955521 - Disclosure - Fair Value (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/FairValueTables</Role>
      <ShortName>Fair Value (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.nvrinc.com/role/FairValue</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>9955522 - Disclosure - Summary of Significant Accounting Policies - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/SummaryofSignificantAccountingPoliciesAdditionalInformationDetail</Role>
      <ShortName>Summary of Significant Accounting Policies - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>35</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>9955523 - Disclosure - Summary of Significant Accounting Policies - Weighted Average Shares and Share Equivalents Used to Calculate Basic and Diluted Earnings Per Share (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/SummaryofSignificantAccountingPoliciesWeightedAverageSharesandShareEquivalentsUsedtoCalculateBasicandDilutedEarningsPerShareDetail</Role>
      <ShortName>Summary of Significant Accounting Policies - Weighted Average Shares and Share Equivalents Used to Calculate Basic and Diluted Earnings Per Share (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>36</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>9955524 - Disclosure - Summary of Significant Accounting Policies - Summary of Antidilutive Securities Excluded from Computation of Earnings Per Share (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/SummaryofSignificantAccountingPoliciesSummaryofAntidilutiveSecuritiesExcludedfromComputationofEarningsPerShareDetail</Role>
      <ShortName>Summary of Significant Accounting Policies - Summary of Antidilutive Securities Excluded from Computation of Earnings Per Share (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>37</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>9955525 - Disclosure - Segment Information, Nature of Operations, and Certain Concentrations - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/SegmentInformationNatureofOperationsandCertainConcentrationsAdditionalInformationDetail</Role>
      <ShortName>Segment Information, Nature of Operations, and Certain Concentrations - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>38</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>9955526 - Disclosure - Segment Information, Nature of Operations, and Certain Concentrations - Revenues (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/SegmentInformationNatureofOperationsandCertainConcentrationsRevenuesDetail</Role>
      <ShortName>Segment Information, Nature of Operations, and Certain Concentrations - Revenues (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.nvrinc.com/role/SegmentInformationNatureofOperationsandCertainConcentrationsTables</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>9955527 - Disclosure - Segment Information , Nature of Operations, and Certain Concentrations - Cost of Sales (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/SegmentInformationNatureofOperationsandCertainConcentrationsCostofSalesDetail</Role>
      <ShortName>Segment Information , Nature of Operations, and Certain Concentrations - Cost of Sales (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>40</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>9955528 - Disclosure - Segment Information, Nature of Operations, and Certain Concentrations - SG&amp;A (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/SegmentInformationNatureofOperationsandCertainConcentrationsSGADetails</Role>
      <ShortName>Segment Information, Nature of Operations, and Certain Concentrations - SG&amp;A (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.nvrinc.com/role/SegmentInformationNatureofOperationsandCertainConcentrationsTables</ParentRole>
      <Position>41</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>9955529 - Disclosure - Segment Information, Nature of Operations, and Certain Concentrations - Corporate Capital Allocation Charge (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/SegmentInformationNatureofOperationsandCertainConcentrationsCorporateCapitalAllocationChargeDetail</Role>
      <ShortName>Segment Information, Nature of Operations, and Certain Concentrations - Corporate Capital Allocation Charge (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>42</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>9955530 - Disclosure - Segment Information, Nature of Operations, and Certain Concentrations - Schedule of other segment items (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/SegmentInformationNatureofOperationsandCertainConcentrationsScheduleofothersegmentitemsDetails</Role>
      <ShortName>Segment Information, Nature of Operations, and Certain Concentrations - Schedule of other segment items (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>9955531 - Disclosure - Segment Information, Nature of Operations, and Certain Concentrations - Profit before Taxes (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/SegmentInformationNatureofOperationsandCertainConcentrationsProfitbeforeTaxesDetail</Role>
      <ShortName>Segment Information, Nature of Operations, and Certain Concentrations - Profit before Taxes (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>9955532 - Disclosure - Segment Information, Nature of Operations, and Certain Concentrations - Consolidated assets (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/SegmentInformationNatureofOperationsandCertainConcentrationsConsolidatedassetsDetail</Role>
      <ShortName>Segment Information, Nature of Operations, and Certain Concentrations - Consolidated assets (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>9955533 - Disclosure - Variable Interest Entities ("VIE's") - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/VariableInterestEntitiesVIEsAdditionalInformationDetail</Role>
      <ShortName>Variable Interest Entities ("VIE's") - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.nvrinc.com/role/VariableInterestEntitiesVIEsTables</ParentRole>
      <Position>46</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>9955534 - Disclosure - Variable Interest Entities ("VIE's") - Total Risk of Loss Related to Contract Land Deposits (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/VariableInterestEntitiesVIEsTotalRiskofLossRelatedtoContractLandDepositsDetail</Role>
      <ShortName>Variable Interest Entities ("VIE's") - Total Risk of Loss Related to Contract Land Deposits (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.nvrinc.com/role/VariableInterestEntitiesVIEsTables</ParentRole>
      <Position>47</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>9955535 - Disclosure - Joint Ventures - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/JointVenturesAdditionalInformationDetail</Role>
      <ShortName>Joint Ventures - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>9955536 - Disclosure - Land Under Development - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/LandUnderDevelopmentAdditionalInformationDetail</Role>
      <ShortName>Land Under Development - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>9955537 - Disclosure - Property Plant and Equipment ("PP&amp;E") - Summary of Property Plant and Equipment (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/PropertyPlantandEquipmentPPESummaryofPropertyPlantandEquipmentDetail</Role>
      <ShortName>Property Plant and Equipment ("PP&amp;E") - Summary of Property Plant and Equipment (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>9955538 - Disclosure - Debt - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/DebtAdditionalInformationDetail</Role>
      <ShortName>Debt - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>9955539 - Disclosure - Common Stock - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/CommonStockAdditionalInformationDetail</Role>
      <ShortName>Common Stock - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>9955540 - Disclosure - Common Stock - Share Repurchase of Common Stock (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/CommonStockShareRepurchaseofCommonStockDetail</Role>
      <ShortName>Common Stock - Share Repurchase of Common Stock (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>53</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>9955541 - Disclosure - Income Taxes - Provision for Income Taxes (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/IncomeTaxesProvisionforIncomeTaxesDetail</Role>
      <ShortName>Income Taxes - Provision for Income Taxes (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>54</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>9955542 - Disclosure - Income Taxes - Deferred Income Taxes on Consolidated Balance Sheets (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/IncomeTaxesDeferredIncomeTaxesonConsolidatedBalanceSheetsDetail</Role>
      <ShortName>Income Taxes - Deferred Income Taxes on Consolidated Balance Sheets (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>9955543 - Disclosure - Income Taxes - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/IncomeTaxesAdditionalInformationDetail</Role>
      <ShortName>Income Taxes - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>9955544 - Disclosure - Income Taxes - Income Tax Expense Reconciliation (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/IncomeTaxesIncomeTaxExpenseReconciliationDetail</Role>
      <ShortName>Income Taxes - Income Tax Expense Reconciliation (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>57</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>9955545 - Disclosure - Income Taxes - Schedule of Income Tax Paid (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/IncomeTaxesScheduleofIncomeTaxPaidDetails</Role>
      <ShortName>Income Taxes - Schedule of Income Tax Paid (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>9955546 - Disclosure - Income Taxes - Reconciliation of Unrecognized Tax Benefits (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/IncomeTaxesReconciliationofUnrecognizedTaxBenefitsDetail</Role>
      <ShortName>Income Taxes - Reconciliation of Unrecognized Tax Benefits (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>59</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>9955547 - Disclosure - Equity-Based Compensation, Profit Sharing and Deferred Compensation Plans - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/EquityBasedCompensationProfitSharingandDeferredCompensationPlansAdditionalInformationDetail</Role>
      <ShortName>Equity-Based Compensation, Profit Sharing and Deferred Compensation Plans - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>60</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>9955548 - Disclosure - Grants Outstanding (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/GrantsOutstandingDetail</Role>
      <ShortName>Grants Outstanding (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>61</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>9955549 - Disclosure - Equity-Based Compensation Rollforward (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/EquityBasedCompensationRollforwardDetail</Role>
      <ShortName>Equity-Based Compensation Rollforward (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>62</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>9955550 - Disclosure - Black-Scholes Option-Pricing Model Assumptions (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/BlackScholesOptionPricingModelAssumptionsDetail</Role>
      <ShortName>Black-Scholes Option-Pricing Model Assumptions (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>9955551 - Disclosure - Exercised Option Proceeds (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/ExercisedOptionProceedsDetail</Role>
      <ShortName>Exercised Option Proceeds (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>64</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>9955552 - Disclosure - Leases - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/LeasesNarrativeDetails</Role>
      <ShortName>Leases - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>65</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>9955553 - Disclosure - Leases - Components of lease expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/LeasesComponentsofleaseexpenseDetails</Role>
      <ShortName>Leases - Components of lease expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>66</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>9955554 - Disclosure - Leases - Other information related to leases (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/LeasesOtherinformationrelatedtoleasesDetails</Role>
      <ShortName>Leases - Other information related to leases (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>67</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>9955555 - Disclosure - Leases - Maturities of Lease Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/LeasesMaturitiesofLeaseLiabilitiesDetails</Role>
      <ShortName>Leases - Maturities of Lease Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>68</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>9955556 - Disclosure - Commitments and Contingent Liabilities - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/CommitmentsandContingentLiabilitiesAdditionalInformationDetail</Role>
      <ShortName>Commitments and Contingent Liabilities - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>69</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>9955557 - Disclosure - Commitments and Contingent Liabilities - Summary of Changes in Product Warranty/Liability Reserve (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/CommitmentsandContingentLiabilitiesSummaryofChangesinProductWarrantyLiabilityReserveDetail</Role>
      <ShortName>Commitments and Contingent Liabilities - Summary of Changes in Product Warranty/Liability Reserve (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>70</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>9955558 - Disclosure - Fair Value - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/FairValueAdditionalInformationDetail</Role>
      <ShortName>Fair Value - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>71</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>9955559 - Disclosure - Fair Value - Undesignated Derivative Instruments (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/FairValueUndesignatedDerivativeInstrumentsDetail</Role>
      <ShortName>Fair Value - Undesignated Derivative Instruments (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>72</Position>
    </Report>
    <Report instance="nvr-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>9955560 - Disclosure - Fair Value - Fair Value Measurement (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nvrinc.com/role/FairValueFairValueMeasurementDetail</Role>
      <ShortName>Fair Value - Fair Value Measurement (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>73</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File doctype="10-K" isDefinitelyFs="true" isUsgaap="true" original="nvr-20251231.htm">nvr-20251231.htm</File>
    <File>nvr-20251231.xsd</File>
    <File>nvr-20251231_cal.xml</File>
    <File>nvr-20251231_def.xml</File>
    <File>nvr-20251231_lab.xml</File>
    <File>nvr-20251231_pre.xml</File>
  </InputFiles>
  <SupplementalFiles>
    <File>nvr-20251231_g1.jpg</File>
  </SupplementalFiles>
  <BaseTaxonomies>
    <BaseTaxonomy items="827">http://fasb.org/us-gaap/2025</BaseTaxonomy>
    <BaseTaxonomy items="15">http://xbrl.sec.gov/cyd/2025</BaseTaxonomy>
    <BaseTaxonomy items="39">http://xbrl.sec.gov/dei/2025</BaseTaxonomy>
    <BaseTaxonomy items="5">http://xbrl.sec.gov/ecd/2025</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
