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Segment Information, Nature of Operations, and Certain Concentrations - Interest Income (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Other Significant Reconciling Item [Line Items]
Consolidated interest income	$ 6,251nvr_InterestIncome	$ 7,302nvr_InterestIncome	$ 5,892nvr_InterestIncome
Mortgage Banking [Member]
Segment Reporting Other Significant Reconciling Item [Line Items]
Interest income	4,940us-gaap_InterestAndFeeIncomeLoansHeldForSaleMortgages / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialMortgageMember	4,983us-gaap_InterestAndFeeIncomeLoansHeldForSaleMortgages / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialMortgageMember	4,504us-gaap_InterestAndFeeIncomeLoansHeldForSaleMortgages / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialMortgageMember
Operating Segments [Member]
Segment Reporting Other Significant Reconciling Item [Line Items]
Interest income	4,940us-gaap_InterestAndFeeIncomeLoansHeldForSaleMortgages / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember	4,983us-gaap_InterestAndFeeIncomeLoansHeldForSaleMortgages / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember	4,504us-gaap_InterestAndFeeIncomeLoansHeldForSaleMortgages / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember
Consolidation adjustments and other [Member]
Segment Reporting Other Significant Reconciling Item [Line Items]
Other unallocated interest income	$ 1,311us-gaap_InterestIncomeOperating / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember	$ 2,319us-gaap_InterestIncomeOperating / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember	$ 1,388us-gaap_InterestIncomeOperating / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember

X

- Definition

Sum of interest income from operating activities and interest and fee income from mortgage loans considered to be held-for-sale.

+ References

No definition available.

+ Details

Name:	nvr_InterestIncome
Namespace Prefix:	nvr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Interest and fee income from mortgage loans considered to be held-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.1)

-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 1

-Article 9

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of operating interest income, including, but not limited to, amortization and accretion of premiums and discounts on securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1(e))

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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- Details

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- Details

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- Details

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