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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
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Other Significant Reconciling Item [Line Items]
Segment reporting reconciling item for operating profit	$ 152,140nvr_SegmentReportingReconcilingItemsForOperatingProfitLossFromSegmentToConsolidatedAmount	$ 116,457nvr_SegmentReportingReconcilingItemsForOperatingProfitLossFromSegmentToConsolidatedAmount	$ 91,507nvr_SegmentReportingReconcilingItemsForOperatingProfitLossFromSegmentToConsolidatedAmount
Homebuilding Mid Atlantic [Member]
Segment Reporting Other Significant Reconciling Item [Line Items]
Segment reporting reconciling item for operating profit	96,328nvr_SegmentReportingReconcilingItemsForOperatingProfitLossFromSegmentToConsolidatedAmount / us-gaap_IncomeStatementLocationAxis = nvr_CorporateCapitalAllocationMember / us-gaap_StatementBusinessSegmentsAxis = nvr_HomebuildingMidAtlanticMember	72,271nvr_SegmentReportingReconcilingItemsForOperatingProfitLossFromSegmentToConsolidatedAmount / us-gaap_IncomeStatementLocationAxis = nvr_CorporateCapitalAllocationMember / us-gaap_StatementBusinessSegmentsAxis = nvr_HomebuildingMidAtlanticMember	59,144nvr_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	12,107nvr_SegmentReportingReconcilingItemsForOperatingProfitLossFromSegmentToConsolidatedAmount / us-gaap_IncomeStatementLocationAxis = nvr_CorporateCapitalAllocationMember / us-gaap_StatementBusinessSegmentsAxis = nvr_HomebuildingNorthEastMember	9,461nvr_SegmentReportingReconcilingItemsForOperatingProfitLossFromSegmentToConsolidatedAmount / us-gaap_IncomeStatementLocationAxis = nvr_CorporateCapitalAllocationMember / us-gaap_StatementBusinessSegmentsAxis = nvr_HomebuildingNorthEastMember	8,187nvr_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	26,299nvr_SegmentReportingReconcilingItemsForOperatingProfitLossFromSegmentToConsolidatedAmount / us-gaap_IncomeStatementLocationAxis = nvr_CorporateCapitalAllocationMember / us-gaap_StatementBusinessSegmentsAxis = nvr_HomebuildingMidEastMember	22,580nvr_SegmentReportingReconcilingItemsForOperatingProfitLossFromSegmentToConsolidatedAmount / us-gaap_IncomeStatementLocationAxis = nvr_CorporateCapitalAllocationMember / us-gaap_StatementBusinessSegmentsAxis = nvr_HomebuildingMidEastMember	15,039nvr_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	$ 17,406nvr_SegmentReportingReconcilingItemsForOperatingProfitLossFromSegmentToConsolidatedAmount / us-gaap_IncomeStatementLocationAxis = nvr_CorporateCapitalAllocationMember / us-gaap_StatementBusinessSegmentsAxis = nvr_HomebuildingSouthEastMember	$ 12,145nvr_SegmentReportingReconcilingItemsForOperatingProfitLossFromSegmentToConsolidatedAmount / us-gaap_IncomeStatementLocationAxis = nvr_CorporateCapitalAllocationMember / us-gaap_StatementBusinessSegmentsAxis = nvr_HomebuildingSouthEastMember	$ 9,137nvr_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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- Details

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