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Segment Information, Nature of Operations, and Certain Concentrations - Revenues (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 Revenue Reconciling Item [Line Items] |  |  |
Total consolidated revenues | $ 4,444,568 us-gaap_Revenues | $ 4,211,267 us-gaap_Revenues | $ 3,184,650 us-gaap_Revenues
Homebuilding Mid Atlantic [Member] |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |
Revenues | 2,617,108 us-gaap_HomeBuildingRevenue / us-gaap_StatementBusinessSegmentsAxis = nvr_HomebuildingMidAtlanticMember | 2,439,387 us-gaap_HomeBuildingRevenue / us-gaap_StatementBusinessSegmentsAxis = nvr_HomebuildingMidAtlanticMember | 1,877,905 us-gaap_HomeBuildingRevenue / us-gaap_StatementBusinessSegmentsAxis = nvr_HomebuildingMidAtlanticMember
Homebuilding North East [Member] |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |
Revenues | 376,862 us-gaap_HomeBuildingRevenue / us-gaap_StatementBusinessSegmentsAxis = nvr_HomebuildingNorthEastMember | 332,681 us-gaap_HomeBuildingRevenue / us-gaap_StatementBusinessSegmentsAxis = nvr_HomebuildingNorthEastMember | 278,715 us-gaap_HomeBuildingRevenue / us-gaap_StatementBusinessSegmentsAxis = nvr_HomebuildingNorthEastMember
Homebuilding Mid East [Member] |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |
Revenues | 892,513 us-gaap_HomeBuildingRevenue / us-gaap_StatementBusinessSegmentsAxis = nvr_HomebuildingMidEastMember | 908,198 us-gaap_HomeBuildingRevenue / us-gaap_StatementBusinessSegmentsAxis = nvr_HomebuildingMidEastMember | 630,367 us-gaap_HomeBuildingRevenue / us-gaap_StatementBusinessSegmentsAxis = nvr_HomebuildingMidEastMember
Homebuilding South East [Member] |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |
Revenues | 488,576 us-gaap_HomeBuildingRevenue / us-gaap_StatementBusinessSegmentsAxis = nvr_HomebuildingSouthEastMember | 454,215 us-gaap_HomeBuildingRevenue / us-gaap_StatementBusinessSegmentsAxis = nvr_HomebuildingSouthEastMember | 334,257 us-gaap_HomeBuildingRevenue / us-gaap_StatementBusinessSegmentsAxis = nvr_HomebuildingSouthEastMember
Mortgage Banking [Member] |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |
Mortgage Banking | $ 69,509 us-gaap_FeesAndCommissionsMortgageBanking / us-gaap_StatementBusinessSegmentsAxis = nvr_MortgageBankingOperationsMember | $ 76,786 us-gaap_FeesAndCommissionsMortgageBanking / us-gaap_StatementBusinessSegmentsAxis = nvr_MortgageBankingOperationsMember | $ 63,406 us-gaap_FeesAndCommissionsMortgageBanking / us-gaap_StatementBusinessSegmentsAxis = nvr_MortgageBankingOperationsMember

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- Definition The noninterest income derived from mortgage banking activities (fees and commissions), excluding fees earned from servicing third-party assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 13 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13 (d)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition Revenue related to the sale of homes and home building activities including design, development, general contracting, and renovation services for residential buildings, including single-family houses, multifamily housing, townhouses, apartments, and modular housing. + 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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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + 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) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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