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Property Plant and Equipment Net - Summary of Property Plant and Equipment Net Table (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Property under Capital Leases [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Net |  | $ 47 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_AssetsHeldUnderCapitalLeasesMember
Homebuilding [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Gross | 106,067 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialRealEstateMember | 85,351 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialRealEstateMember
Less: accumulated depreciation | (59,825)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialRealEstateMember | (52,752)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialRealEstateMember
Property, Plant and Equipment, Net | 46,242 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialRealEstateMember | 32,599 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialRealEstateMember
Homebuilding [Member] | Office Facilities and Other [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Gross | 29,326 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = nvr_OfficeFacilitiesAndOtherEquipmentMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialRealEstateMember | 19,547 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = nvr_OfficeFacilitiesAndOtherEquipmentMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialRealEstateMember
Homebuilding [Member] | Model Home Furniture and Fixtures [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Gross | 28,945 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_FurnitureAndFixturesMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialRealEstateMember | 22,432 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_FurnitureAndFixturesMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialRealEstateMember
Homebuilding [Member] | Production Facilities [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Gross | 47,796 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = nvr_ProductionFacilityMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialRealEstateMember | 39,396 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = nvr_ProductionFacilityMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialRealEstateMember
Homebuilding [Member] | Property under Capital Leases [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Gross |  | 3,976 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_AssetsHeldUnderCapitalLeasesMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialRealEstateMember
Mortgage Banking [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Net | 6,189 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialMortgageMember | 4,699 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialMortgageMember
Mortgage Banking [Member] | Office Facilities and Other [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Gross | 10,508 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = nvr_OfficeFacilitiesAndOtherEquipmentMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialMortgageMember | 8,118 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = nvr_OfficeFacilitiesAndOtherEquipmentMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialMortgageMember
Less: accumulated depreciation | (4,319)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = nvr_OfficeFacilitiesAndOtherEquipmentMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialMortgageMember | (3,419)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = nvr_OfficeFacilitiesAndOtherEquipmentMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialMortgageMember
Property, Plant and Equipment, Net | $ 6,189 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = nvr_OfficeFacilitiesAndOtherEquipmentMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialMortgageMember | $ 4,699 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = nvr_OfficeFacilitiesAndOtherEquipmentMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialMortgageMember

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- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 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 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 14 -Article 5 + Details
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- Definition Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 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 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 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 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph a -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 7 + Details
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