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v2.4.1.9

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

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- 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
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Namespace Prefix: | nvr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- 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 + Details
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Period Type: | duration

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- 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 + Details
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- Details
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- Details
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- Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |