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Segment Disclosures - Additional Information (Detail) | 3 Months Ended | 0 Months Ended
--- | --- | ---
Mar. 31, 2015 | Sep. 10, 2012
Segment Reporting Information [Line Items] |  |
Senior notes interest rate | 3.95%us-gaap_DebtInstrumentInterestRateStatedPercentage |
Senior notes maturity | Sep. 15, 2022 |
Senior Notes due 2022 [Member] |  |
Segment Reporting Information [Line Items] |  |
Senior notes interest rate |  | 3.95%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = nvr_SeniorNotesDueTwoThousandTwentyTwoMember
Senior notes maturity |  | Sep. 15, 2022
Homebuilding [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of reportable segments | 4 us-gaap_NumberOfReportableSegments / us-gaap_StatementBusinessSegmentsAxis = nvr_HomebuildingMember |
Mortgage Banking [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of reportable segments | 1 us-gaap_NumberOfReportableSegments / us-gaap_StatementBusinessSegmentsAxis = nvr_MortgageBankingMember |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Details
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Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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