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Segment Information, Nature of Operations, and Certain Concentrations - Assets (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | --- | --- | ---
Segment Reporting Asset Reconciling Item [Line Items] |  |  |  |
Consolidated assets | $ 2,351,335 us-gaap_Assets | $ 2,486,148 us-gaap_Assets |  |
Cash and cash equivalents | 545,419 us-gaap_CashAndCashEquivalentsAtCarryingValue | 866,253 us-gaap_CashAndCashEquivalentsAtCarryingValue | 1,153,507 us-gaap_CashAndCashEquivalentsAtCarryingValue | 480,794 us-gaap_CashAndCashEquivalentsAtCarryingValue
Contract land deposit reserve | (56,074)nvr_LossReserveOnContractLandDeposits | (59,761)nvr_LossReserveOnContractLandDeposits |  |
Operating Segments [Member] |  |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |  |
Consolidated assets | 1,615,009 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 1,427,205 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember |  |
Operating Segments [Member] | Homebuilding Mid Atlantic [Member] |  |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |  |
Consolidated assets | 917,689 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = nvr_HomebuildingMidAtlanticMember | 810,270 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = nvr_HomebuildingMidAtlanticMember |  |
Operating Segments [Member] | Homebuilding North East [Member] |  |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |  |
Consolidated assets | 103,631 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = nvr_HomebuildingNorthEastMember | 84,958 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = nvr_HomebuildingNorthEastMember |  |
Operating Segments [Member] | Homebuilding Mid East [Member] |  |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |  |
Consolidated assets | 192,781 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = nvr_HomebuildingMidEastMember | 172,167 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = nvr_HomebuildingMidEastMember |  |
Operating Segments [Member] | Homebuilding South East [Member] |  |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |  |
Consolidated assets | 144,939 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = nvr_HomebuildingSouthEastMember | 106,389 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = nvr_HomebuildingSouthEastMember |  |
Operating Segments [Member] | Mortgage Banking [Member] |  |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |  |
Consolidated assets | 255,969 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = nvr_MortgageBankingOperationsMember | 253,421 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = nvr_MortgageBankingOperationsMember |  |
Reconciling Items Sub-Total [Member] |  |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |  |
Consolidated variable interest entity | 3,590 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember | 7,268 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember |  |
Cash and cash equivalents | 514,780 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember | 844,274 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember |  |
Deferred taxes | 165,189 us-gaap_DeferredTaxAssetsNet / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember | 162,378 us-gaap_DeferredTaxAssetsNet / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember |  |
Intangible assets and goodwill | 54,291 us-gaap_IntangibleAssetsNetIncludingGoodwill / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember | 55,674 us-gaap_IntangibleAssetsNetIncludingGoodwill / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember |  |
Contract land deposit reserve | (56,074)nvr_LossReserveOnContractLandDeposits / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember | (59,761)nvr_LossReserveOnContractLandDeposits / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember |  |
Reconciling items sub-total | 736,326 nvr_SegmentReportingAssetReconcilingItemNetAmount / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember | 1,058,943 nvr_SegmentReportingAssetReconcilingItemNetAmount / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember |  |
Consolidation adjustments and other [Member] |  |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |  |
Consolidated assets | $ 54,550 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember | $ 49,110 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember |  |

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- Definition The reserve account established to account for expected but unspecified losses related to contract land deposits. + References No definition available. + Details
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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -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 03 -Paragraph 12 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3044-108585 + Details
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- Definition Carrying amount of finite-lived intangible assets, indefinite-lived intangible assets and goodwill. Goodwill is an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Intangible assets are assets, not including financial assets, lacking physical substance. + References No definition available. + Details
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