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Segment Information, Nature of Operations, and Certain Concentrations - Corporate Capital Allocation Charge (Detail) (Corporate Capital Allocation [Member], 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] |  |  |
Segment reporting reconciling item for operating profit | $ 152,140 nvr_SegmentReportingReconcilingItemsForOperatingProfitLossFromSegmentToConsolidatedAmount | $ 116,457 nvr_SegmentReportingReconcilingItemsForOperatingProfitLossFromSegmentToConsolidatedAmount | $ 91,507 nvr_SegmentReportingReconcilingItemsForOperatingProfitLossFromSegmentToConsolidatedAmount
Homebuilding Mid Atlantic [Member] |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Segment reporting reconciling item for operating profit | 96,328 nvr_SegmentReportingReconcilingItemsForOperatingProfitLossFromSegmentToConsolidatedAmount / us-gaap_IncomeStatementLocationAxis = nvr_CorporateCapitalAllocationMember / us-gaap_StatementBusinessSegmentsAxis = nvr_HomebuildingMidAtlanticMember | 72,271 nvr_SegmentReportingReconcilingItemsForOperatingProfitLossFromSegmentToConsolidatedAmount / us-gaap_IncomeStatementLocationAxis = nvr_CorporateCapitalAllocationMember / us-gaap_StatementBusinessSegmentsAxis = nvr_HomebuildingMidAtlanticMember | 59,144 nvr_SegmentReportingReconcilingItemsForOperatingProfitLossFromSegmentToConsolidatedAmount / us-gaap_IncomeStatementLocationAxis = nvr_CorporateCapitalAllocationMember / us-gaap_StatementBusinessSegmentsAxis = nvr_HomebuildingMidAtlanticMember
Homebuilding North East [Member] |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Segment reporting reconciling item for operating profit | 12,107 nvr_SegmentReportingReconcilingItemsForOperatingProfitLossFromSegmentToConsolidatedAmount / us-gaap_IncomeStatementLocationAxis = nvr_CorporateCapitalAllocationMember / us-gaap_StatementBusinessSegmentsAxis = nvr_HomebuildingNorthEastMember | 9,461 nvr_SegmentReportingReconcilingItemsForOperatingProfitLossFromSegmentToConsolidatedAmount / us-gaap_IncomeStatementLocationAxis = nvr_CorporateCapitalAllocationMember / us-gaap_StatementBusinessSegmentsAxis = nvr_HomebuildingNorthEastMember | 8,187 nvr_SegmentReportingReconcilingItemsForOperatingProfitLossFromSegmentToConsolidatedAmount / us-gaap_IncomeStatementLocationAxis = nvr_CorporateCapitalAllocationMember / us-gaap_StatementBusinessSegmentsAxis = nvr_HomebuildingNorthEastMember
Homebuilding Mid East [Member] |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Segment reporting reconciling item for operating profit | 26,299 nvr_SegmentReportingReconcilingItemsForOperatingProfitLossFromSegmentToConsolidatedAmount / us-gaap_IncomeStatementLocationAxis = nvr_CorporateCapitalAllocationMember / us-gaap_StatementBusinessSegmentsAxis = nvr_HomebuildingMidEastMember | 22,580 nvr_SegmentReportingReconcilingItemsForOperatingProfitLossFromSegmentToConsolidatedAmount / us-gaap_IncomeStatementLocationAxis = nvr_CorporateCapitalAllocationMember / us-gaap_StatementBusinessSegmentsAxis = nvr_HomebuildingMidEastMember | 15,039 nvr_SegmentReportingReconcilingItemsForOperatingProfitLossFromSegmentToConsolidatedAmount / us-gaap_IncomeStatementLocationAxis = nvr_CorporateCapitalAllocationMember / us-gaap_StatementBusinessSegmentsAxis = nvr_HomebuildingMidEastMember
Homebuilding South East [Member] |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Segment reporting reconciling item for operating profit | $ 17,406 nvr_SegmentReportingReconcilingItemsForOperatingProfitLossFromSegmentToConsolidatedAmount / us-gaap_IncomeStatementLocationAxis = nvr_CorporateCapitalAllocationMember / us-gaap_StatementBusinessSegmentsAxis = nvr_HomebuildingSouthEastMember | $ 12,145 nvr_SegmentReportingReconcilingItemsForOperatingProfitLossFromSegmentToConsolidatedAmount / us-gaap_IncomeStatementLocationAxis = nvr_CorporateCapitalAllocationMember / us-gaap_StatementBusinessSegmentsAxis = nvr_HomebuildingSouthEastMember | $ 9,137 nvr_SegmentReportingReconcilingItemsForOperatingProfitLossFromSegmentToConsolidatedAmount / us-gaap_IncomeStatementLocationAxis = nvr_CorporateCapitalAllocationMember / us-gaap_StatementBusinessSegmentsAxis = nvr_HomebuildingSouthEastMember

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

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- Details
Name: | us-gaap_SegmentReportingOtherSignificantReconcilingItemLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration