Entity tax identification number Entity Tax Identification Number Total investments in the Master Trust Total investment EBP, Investment, Fair Value Rollovers EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Rollover Maximum Maximum [Member] Late repayment included EBP, Schedule of Delinquent Participant Contribution, Late Repayment Included [true false] Legal Entity [Axis] Legal Entity [Axis] Statistical Measurement [Domain] Statistical Measurement [Domain] EBP, Description of Plan [Table] EBP, Description of Plan [Table] Investments in registered investment companies Mutual Fund [Member] Total fully corrected under VFCP and PTE 2002-51 EBP, Schedule of Delinquent Participant Contribution, Corrected Due to participants EBP, Liability to Participant Cash EBP, Other Investment [Member] EBP, Related Party and Party-in-Interest Transactions [Table] EBP, Related Party and Party-in-Interest Transactions [Table] Voluntary salary deferral contributions, maximum percentage EBP, Participant Contribution, Pretax, Maximum Annual Compensation to Total Compensation, Percentage Self-directed brokerage accounts EBP, Self-Directed Brokerage Account [Member] Total deductions EBP, Change in Net Asset Available for Benefit, Decrease Maximum borrowing, amount EBP, Note Receivable from Participant, Account, Maximum Borrowing, Amount Total investments in the Master Trust EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value Plan's Interest EBP, Nonconsolidated, Plan Interest in Master Trust [Member] Level 1 Fair Value, Inputs, Level 1 [Member] Reconciliation of Financial Statements to Form 5500 EBP, Reconciliation of Financial Statement to Form 5500 [Table Text Block] Total assets EBP, Asset EBP, Asset [Abstract] EBP, Asset [Abstract] Statistical Measurement [Axis] Statistical Measurement [Axis] Employer contribution, annual vesting percentage EBP, Employer Contribution, Annual Vesting Percentage EBP, Employer Contribution, Annual Vesting Percentage Additions to net assets attributable to: EBP, Change in Net Asset Available for Benefit, Increase [Abstract] EBP, Statement of Change in Net Asset Available for Benefit [Table] EBP, Statement of Change in Net Asset Available for Benefit [Table] Payments of Benefits EBP, Payment to Participant [Policy Text Block] EBP, Master Trust [Line Items] EBP, Master Trust [Line Items] Amendment Flag Amendment Flag Deemed distribution EBP, Reconciliation to Form 5500, Net Asset Available for Benefit, Deemed Distribution Basis of Presentation EBP, Basis of Accounting [Policy Text Block] EBP, Schedule of Asset Held for Investment [Table] EBP, Schedule of Asset Held for Investment [Table] Fair Value Measurements EBP, Investment, Fair Value and NAV [Policy Text Block] EBP, Investment, Fair Value and NAV Investment, number of shares (in shares) EBP, Investment, Number of Shares EBP, Description of Plan and Accounting Change [Abstract] Receivables: EBP, Receivable [Abstract] Schedule of Financial Instruments in the Master Trust Measured at Fair Value EBP, Investment, Fair Value and NAV [Table Text Block] Investments [Domain] Investments [Domain] EBP, Schedule of Delinquent Participant Contribution [Abstract] EBP, Master Trust [Abstract] Use of Estimates in Preparation of Financial Statements EBP, Use of Estimate [Policy Text Block] EBP, Related Party and Party-in-Interest [Domain] EBP, Related Party and Party-in-Interest [Domain] Schedule H, Line 4(i) - Schedule of Assets (Held at End of Year) EBP, Schedule of Asset Held for Investment [Text Block] Cover [Abstract] Risks and Uncertainties EBP, Risk and Uncertainty [Text Block] Employer Increase from employer contribution EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash EBP, Schedule of Delinquent Participant Contribution [Line Items] EBP, Schedule of Delinquent Participant Contribution [Line Items] Minimum Minimum [Member] EBP, Related Party and Party-in-Interest [Axis] EBP, Related Party and Party-in-Interest [Axis] Investment Type [Axis] Investment Type [Axis] Interest income on notes receivable from participants EBP, Change in Net Asset Available for Benefit, Increase from Interest Income on Note Receivable from Participant Total contributions EBP, Change in Net Asset Available for Benefit, Increase from Contribution Employee EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Excluding Rollover Plan's share of net investment income of master trust EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Gain (Loss) on Investment EBP, Description of Plan [Line Items] EBP, Description of Plan [Line Items] Plan number EBP, Plan Number Description of Plan and Benefits EBP, Description of Plan [Text Block] Contributions pending correction in VFCP EBP, Schedule of Delinquent Participant Contribution, Pending Correction in VFCP EBP, Statement of Change in Net Asset Available for Benefit [Line Items] EBP, Statement of Change in Net Asset Available for Benefit [Line Items] EBP, Statement of Net Asset Available for Benefit [Table] EBP, Statement of Net Asset Available for Benefit [Table] Deemed distributions reported in 2024 Form 5500 EBP, Reconciliation to Form 5500, Change in Net Asset Available for Benefit, Prior Period, Increase from Deemed Distribution EBP, Schedule of Asset Held for Investment [Line Items] EBP, Schedule of Asset Held for Investment [Line Items] EBP, Nonconsolidated, Master Trust and Plan Interest in Master Trust [Domain] EBP, Nonconsolidated, Master Trust and Plan Interest in Master Trust [Domain] NVR, Inc common stock EBP, Employer, Common Stock [Member] EBP, Schedule of Asset Held for Investment [Abstract] EBP, Accounting Policy [Table] EBP, Accounting Policy [Table] Total additions EBP, Change in Net Asset Available for Benefit, Increase Net investment gain: EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment [Abstract] Administrative expenses EBP, Change in Net Asset Available for Benefit, Decrease from Administrative Expense Document Information [Line Items] Document Information [Line Items] EBP, Risk and Uncertainty [Line Items] EBP, Risk and Uncertainty [Line Items] EBP, Risk and Uncertainty [Table] EBP, Risk and Uncertainty [Table] Investments EBP, Master Trust [Text Block] EBP, Statement of Change in Net Asset Available for Benefit [Abstract] Level 2 Fair Value, Inputs, Level 2 [Member] Deemed distributions reported in 2025 Form 5500 EBP, Reconciliation to Form 5500, Change in Net Asset Available for Benefit, Current Period, Decrease from Deemed Distribution Maximum number of loans outstanding EBP, Note Receivable from Participant, Account, Maximum Number Of Loans Outstanding EBP, Note Receivable from Participant, Account, Maximum Number Of Loans Outstanding Increase in net assets as reported in the Form 5500 EBP, Form 5500 Caption, Net Income (Loss) Participant accounts, vesting percentage EBP, Participant Accounts, Vesting Percentage EBP, Participant Accounts, Vesting Percentage Contributions corrected outside of VFCP (1) EBP, Schedule of Delinquent Participant Contribution, Corrected Outside VFCP EBP, Tax Status [Table] EBP, Tax Status [Table] Increase in net assets available for plan benefits Increase in net assets as reported in the financial statements EBP, Change in Net Asset Available for Benefit, Increase (Decrease) Related Parties and Parties-In-Interest EBP, Related Party and Party-in-Interest Transactions [Text Block] EBP, Related Party and Party-in-Interest Transactions [Abstract] EBP, Accounting Policy, Accounting Standard Update, and Change in Accounting Principle [Abstract] EBP, Accounting Policy, Accounting Standard Update, and Change in Accounting Principle [Abstract] Total receivables EBP, Receivable Dividend income EBP, Change in Net Asset Available for Benefit, Increase from Dividend Income on Investment Benefits paid to participants EBP, Change in Net Asset Available for Benefit, Decrease from Payment to Participant Plan's interest in master trust, at fair value EBP, Investment, Plan Interest in Master Trust, Fair Value Participant contributions transferred late to Plan EBP, Schedule of Delinquent Participant Contribution, Transferred Late to Plan Vesting age EBP, Employer Contribution Maximum Vesting Age EBP, Employer Contribution Maximum Vesting Age Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Voluntary salary deferral contributions, minimum percentage EBP, Participant Contribution, Pretax, Minimum Annual Compensation to Total Compensation, Percentage EBP, Participant Contribution, Pretax, Minimum Annual Compensation to Total Compensation, Percentage EBP, Statement of Net Asset Available for Benefit [Abstract] EBP, Accounting Policy [Line Items] EBP, Accounting Policy [Line Items] EBP, Tax Status [Abstract] EBP, Reconciliation of Financial Statement to Form 5500 [Table] EBP, Reconciliation of Financial Statement to Form 5500 [Table] EBP, Reconciliation of Financial Statement to Form 5500 [Line Items] EBP, Reconciliation of Financial Statement to Form 5500 [Line Items] Reconciliation of Financial Statements to Form 5500 EBP, Reconciliation of Financial Statement to Form 5500 [Text Block] Current value EBP, Asset Held for Investment, Participant Loan, after Deemed Distribution Investment Income and Investment Valuation and Transactions EBP, Investment [Policy Text Block] EBP, Master Trust [Table] EBP, Master Trust [Table] Total Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] Document Type Document Type EBP, Other Related Party and Party-in-Interest EBP, Other Related Party and Party-in-Interest [Member] Plan Termination EBP, Plan Termination [Text Block] Entity Central Index Key Entity Central Index Key Cost EBP, Asset Held for Investment, Participant Loan, Cost EBP, Asset Held for Investment, Participant Loan, Cost Participant loan, interest rate EBP, Asset Held for Investment, Participant Loan, Interest Rate EBP, Reconciliation of Financial Statement to Form 5500 [Abstract] Investments in common/collective trusts Common Collective Trust [Member] Forfeitures reallocated to participant EBP, Forfeited Nonvested Account, Reallocated to Participant Basis spread on variable rate EBP, Participant Loan, Basis Spread On Variable Rate EBP, Participant Loan, Basis Spread On Variable Rate EBP, Risk and Uncertainty [Abstract] EBP, Tax Status [Line Items] EBP, Tax Status [Line Items] EBP, Subsequent Event [Table] EBP, Subsequent Event [Table] Deductions from net assets attributable to: EBP, Change in Net Asset Available for Benefit, Decrease [Abstract] Notes receivable from participants EBP, Note Receivable from Participant Master Trust EBP, Nonconsolidated, Master Trust [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Summary of Significant Accounting Policies EBP, Summary of Accounting Policy [Text Block] Entity Registrant Name Entity Registrant Name Schedule of Investments Held by the Master Trust and the Plan's interest EBP, Master Trust [Table Text Block] EBP, Subsequent Event [Abstract] LIABILITIES EBP, Liability [Abstract] Subsequent Events EBP, Subsequent Event [Text Block] Schedule H, Line 4(a) - Schedule of Delinquent Participant Contributions EBP, Schedule of Delinquent Participant Contribution [Text Block] EBP, Schedule of Delinquent Participant Contribution [Table] EBP, Schedule of Delinquent Participant Contribution [Table] EBP 333 EBP 333 [Member] EBP333Member Tax Status EBP, Tax Status [Text Block] Maximum borrowing, to total account, percentage EBP, Note Receivable from Participant, Account, Maximum Borrowing, to Total Account, Percentage EBP, Subsequent Event [Line Items] EBP, Subsequent Event [Line Items] Document Information [Table] Document Information [Table] Net investment gain in Master Trust EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment EBP, Nonconsolidated, Master Trust and Plan Interest in Master Trust [Axis] EBP, Nonconsolidated, Master Trust and Plan Interest in Master Trust [Axis] EBP, Related Party and Party-in-Interest Transactions [Line Items] EBP, Related Party and Party-in-Interest Transactions [Line Items] Level 3 Fair Value, Inputs, Level 3 [Member] Contributions not corrected EBP, Schedule of Delinquent Participant Contribution, Not Corrected Interest, dividends and other EBP, Other Receivable Net assets available for plan benefits Net assets available for plan benefits at beginning of year Net assets available for plan benefits at end of year Net assets available as reported in the financial statements EBP, Net Asset Available for Benefit Entity [Domain] Entity [Domain] Contributions: EBP, Change in Net Asset Available for Benefit, Increase from Contribution [Abstract] Net assets available as reported in the Form 5500 EBP, Form 5500 Caption, Net Assets Investments measured at net asset value Fair Value Measured at Net Asset Value Per Share [Member] EBP, Statement of Net Asset Available for Benefit [Line Items] EBP, Statement of Net Asset Available for Benefit [Line Items]