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Joint Ventures - Condensed Balance Sheets of Consolidated JV (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014 | Dec. 31, 2013
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Schedule Of Equity Method Investments [Line Items] |  |  |  |
Cash | $ 532,513 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 545,419 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 879,323 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 866,253 us-gaap_CashAndCashEquivalentsAtCarryingValue
Land under development | 35,813 us-gaap_InventoryRealEstateLandAndLandDevelopmentCosts |  |  |
Equity | 1,165,237 us-gaap_StockholdersEquity | 1,124,255 us-gaap_StockholdersEquity |  |
Total liabilities and shareholders' equity | 2,376,134 us-gaap_LiabilitiesAndStockholdersEquity | 2,351,335 us-gaap_LiabilitiesAndStockholdersEquity |  |
Consolidated JV [Member] |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Cash | 1,545 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = nvr_ConsolidatedJointVentureMember | 481 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = nvr_ConsolidatedJointVentureMember |  |
Restricted cash |  | 160 us-gaap_RestrictedCashAndCashEquivalents / dei_LegalEntityAxis = nvr_ConsolidatedJointVentureMember |  |
Other assets | 266 us-gaap_OtherAssets / dei_LegalEntityAxis = nvr_ConsolidatedJointVentureMember | 332 us-gaap_OtherAssets / dei_LegalEntityAxis = nvr_ConsolidatedJointVentureMember |  |
Land under development | 1,734 us-gaap_InventoryRealEstateLandAndLandDevelopmentCosts / dei_LegalEntityAxis = nvr_ConsolidatedJointVentureMember | 2,617 us-gaap_InventoryRealEstateLandAndLandDevelopmentCosts / dei_LegalEntityAxis = nvr_ConsolidatedJointVentureMember |  |
Total assets | 3,545 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / dei_LegalEntityAxis = nvr_ConsolidatedJointVentureMember | 3,590 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / dei_LegalEntityAxis = nvr_ConsolidatedJointVentureMember |  |
Debt |  | 64 us-gaap_NonRecourseDebt / dei_LegalEntityAxis = nvr_ConsolidatedJointVentureMember |  |
Accrued expenses | 1,399 us-gaap_AccruedLiabilitiesCurrentAndNoncurrent / dei_LegalEntityAxis = nvr_ConsolidatedJointVentureMember | 1,231 us-gaap_AccruedLiabilitiesCurrentAndNoncurrent / dei_LegalEntityAxis = nvr_ConsolidatedJointVentureMember |  |
Equity | 2,146 us-gaap_StockholdersEquity / dei_LegalEntityAxis = nvr_ConsolidatedJointVentureMember | 2,295 us-gaap_StockholdersEquity / dei_LegalEntityAxis = nvr_ConsolidatedJointVentureMember |  |
Total liabilities and shareholders' equity | $ 3,545 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = nvr_ConsolidatedJointVentureMember | $ 3,590 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = nvr_ConsolidatedJointVentureMember |  |

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- Definition Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(5)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph a -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph 5 -Article 9 + Details
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- Definition Carrying amount as of the balance sheet date, net of valuation allowances and impairment losses, of costs of land expected to be developed in the near term plus capitalized costs of development, for purposes of selling completed units to home buyers or commercial or industrial entities.. + 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 210.5-02.6(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 6 -Subparagraph a -Article 5 + Details
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