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Segment Information, Nature of Operations, and Certain Concentrations - Interest Expense (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 expense | $ 23,140 us-gaap_InterestExpense | $ 22,385 us-gaap_InterestExpense | $ 7,529 us-gaap_InterestExpense
Mortgage Banking [Member] |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Consolidated interest expense | 549 us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialMortgageMember | 545 us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialMortgageMember | 546 us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialMortgageMember
Operating Segments [Member] |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Consolidated interest expense | 152,736 us-gaap_InterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 117,100 us-gaap_InterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 92,240 us-gaap_InterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember
Operating Segments [Member] | Homebuilding Mid Atlantic [Member] |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Consolidated interest expense | 96,364 us-gaap_InterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = nvr_HomebuildingMidAtlanticMember | 72,351 us-gaap_InterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = nvr_HomebuildingMidAtlanticMember | 59,310 us-gaap_InterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = nvr_HomebuildingMidAtlanticMember
Operating Segments [Member] | Homebuilding North East [Member] |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Consolidated interest expense | 12,114 us-gaap_InterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = nvr_HomebuildingNorthEastMember | 9,466 us-gaap_InterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = nvr_HomebuildingNorthEastMember | 8,196 us-gaap_InterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = nvr_HomebuildingNorthEastMember
Operating Segments [Member] | Homebuilding Mid East [Member] |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Consolidated interest expense | 26,300 us-gaap_InterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = nvr_HomebuildingMidEastMember | 22,587 us-gaap_InterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = nvr_HomebuildingMidEastMember | 15,043 us-gaap_InterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = nvr_HomebuildingMidEastMember
Operating Segments [Member] | Homebuilding South East [Member] |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Consolidated interest expense | 17,409 us-gaap_InterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = nvr_HomebuildingSouthEastMember | 12,151 us-gaap_InterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = nvr_HomebuildingSouthEastMember | 9,145 us-gaap_InterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = nvr_HomebuildingSouthEastMember
Operating Segments [Member] | Mortgage Banking [Member] |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Consolidated interest expense | 549 us-gaap_InterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialMortgageMember | 545 us-gaap_InterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialMortgageMember | 546 us-gaap_InterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialMortgageMember
Reconciling Items Sub-Total [Member] | Corporate Capital Allocation [Member] |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Segment reporting reconciling item | (152,140)nvr_SegmentReportingReconcilingItemsForOperatingProfitLossFromSegmentToConsolidatedAmount / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember / us-gaap_StatementBusinessSegmentsAxis = nvr_CorporateCapitalAllocationMember | (116,457)nvr_SegmentReportingReconcilingItemsForOperatingProfitLossFromSegmentToConsolidatedAmount / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember / us-gaap_StatementBusinessSegmentsAxis = nvr_CorporateCapitalAllocationMember | (91,507)nvr_SegmentReportingReconcilingItemsForOperatingProfitLossFromSegmentToConsolidatedAmount / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember / us-gaap_StatementBusinessSegmentsAxis = nvr_CorporateCapitalAllocationMember
Consolidation adjustments and other [Member] |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Segment reporting reconciling item | (23,867)nvr_SegmentReportingReconcilingItemsForOperatingProfitLossFromSegmentToConsolidatedAmount / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember | (2,362)nvr_SegmentReportingReconcilingItemsForOperatingProfitLossFromSegmentToConsolidatedAmount / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember | (10,858)nvr_SegmentReportingReconcilingItemsForOperatingProfitLossFromSegmentToConsolidatedAmount / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember
Consolidation adjustments and other [Member] | Senior Notes And Other Interest [Member] |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Senior notes and other interest | $ 22,544 nvr_SegmentReportingReconcilingItemsForInterestExpenseFromSegmentToConsolidatedAmount / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember / us-gaap_StatementBusinessSegmentsAxis = nvr_SeniorNoteAndOtherInterestMember | $ 21,742 nvr_SegmentReportingReconcilingItemsForInterestExpenseFromSegmentToConsolidatedAmount / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember / us-gaap_StatementBusinessSegmentsAxis = nvr_SeniorNoteAndOtherInterestMember | $ 6,796 nvr_SegmentReportingReconcilingItemsForInterestExpenseFromSegmentToConsolidatedAmount / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember / us-gaap_StatementBusinessSegmentsAxis = nvr_SeniorNoteAndOtherInterestMember

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- Definition Amount of an item in the reconciliation of total interest expense from reportable segments, to the entity's consolidated interest charged against earnings. + References No definition available. + Details
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- Definition Amount of an item in the reconciliation of total profit or loss from reportable segments, to the entity's consolidated income before income taxes, extraordinary items, discontinued operations. + References No definition available. + Details
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- Definition Amount of the cost of borrowed funds accounted for as interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 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 210.9-04.9) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 9 -Article 9 + Details
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