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Quarterly Results (unaudited) - Quarterly Financial Data and Operating Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 Contract Settlements Backlog | Sep. 30, 2014 Settlements Contract Backlog | Jun. 30, 2014 Backlog Contract Settlements | Mar. 31, 2014 Contract Backlog Settlements | Dec. 31, 2013 Contract Settlements Backlog | Sep. 30, 2013 Backlog Contract Settlements | Jun. 30, 2013 Settlements Backlog Contract | Mar. 31, 2013 Settlements Backlog Contract | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income | $ 99,451 us-gaap_NetIncomeLoss | $ 90,152 us-gaap_NetIncomeLoss | $ 68,178 us-gaap_NetIncomeLoss | $ 23,849 us-gaap_NetIncomeLoss | $ 97,811 us-gaap_NetIncomeLoss | $ 82,935 us-gaap_NetIncomeLoss | $ 50,690 us-gaap_NetIncomeLoss | $ 35,041 us-gaap_NetIncomeLoss | $ 281,630 us-gaap_NetIncomeLoss | $ 266,477 us-gaap_NetIncomeLoss | $ 180,588 us-gaap_NetIncomeLoss
Diluted earnings per share | $ 23.24 us-gaap_EarningsPerShareDiluted | $ 20.70 us-gaap_EarningsPerShareDiluted | $ 15.17 us-gaap_EarningsPerShareDiluted | $ 5.16 us-gaap_EarningsPerShareDiluted | $ 21.15 us-gaap_EarningsPerShareDiluted | $ 17.67 us-gaap_EarningsPerShareDiluted | $ 10.11 us-gaap_EarningsPerShareDiluted | $ 6.84 us-gaap_EarningsPerShareDiluted | $ 63.50 us-gaap_EarningsPerShareDiluted | $ 54.81 us-gaap_EarningsPerShareDiluted | $ 35.12 us-gaap_EarningsPerShareDiluted
Contracts for sale, net of cancellations (units) | 2,713 nvr_ContractsForSaleNetOfCancellation | 2,936 nvr_ContractsForSaleNetOfCancellation | 3,415 nvr_ContractsForSaleNetOfCancellation | 3,325 nvr_ContractsForSaleNetOfCancellation | 2,631 nvr_ContractsForSaleNetOfCancellation | 2,381 nvr_ContractsForSaleNetOfCancellation | 3,278 nvr_ContractsForSaleNetOfCancellation | 3,510 nvr_ContractsForSaleNetOfCancellation |  |  |
Settlements (units) | 3,469 nvr_NumberOfSettlements | 3,236 nvr_NumberOfSettlements | 2,943 nvr_NumberOfSettlements | 2,211 nvr_NumberOfSettlements | 3,342 nvr_NumberOfSettlements | 3,342 nvr_NumberOfSettlements | 2,878 nvr_NumberOfSettlements | 2,272 nvr_NumberOfSettlements |  |  |
Backlog, end of period (units) | 5,475 nvr_NumberOfBacklogUnitsAtPeriodEnd | 6,231 nvr_NumberOfBacklogUnitsAtPeriodEnd | 6,531 nvr_NumberOfBacklogUnitsAtPeriodEnd | 6,059 nvr_NumberOfBacklogUnitsAtPeriodEnd | 4,945 nvr_NumberOfBacklogUnitsAtPeriodEnd | 5,656 nvr_NumberOfBacklogUnitsAtPeriodEnd | 6,617 nvr_NumberOfBacklogUnitsAtPeriodEnd | 6,217 nvr_NumberOfBacklogUnitsAtPeriodEnd |  |  |
Loans closed | 881,930 nvr_LoansClosed | 803,125 nvr_LoansClosed | 675,625 nvr_LoansClosed | 472,933 nvr_LoansClosed | 721,926 nvr_LoansClosed | 695,930 nvr_LoansClosed | 646,450 nvr_LoansClosed | 473,766 nvr_LoansClosed |  |  |
Homebuilding [Member] |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues – homebuilding operations | 1,306,632 us-gaap_HomeBuildingRevenue / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialRealEstateMember | 1,185,160 us-gaap_HomeBuildingRevenue / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialRealEstateMember | 1,084,080 us-gaap_HomeBuildingRevenue / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialRealEstateMember | 799,187 us-gaap_HomeBuildingRevenue / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialRealEstateMember | 1,223,808 us-gaap_HomeBuildingRevenue / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialRealEstateMember | 1,167,595 us-gaap_HomeBuildingRevenue / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialRealEstateMember | 992,210 us-gaap_HomeBuildingRevenue / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialRealEstateMember | 750,868 us-gaap_HomeBuildingRevenue / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialRealEstateMember | 4,375,059 us-gaap_HomeBuildingRevenue / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialRealEstateMember | 4,134,481 us-gaap_HomeBuildingRevenue / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialRealEstateMember | 3,121,244 us-gaap_HomeBuildingRevenue / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialRealEstateMember
Gross profit – homebuilding operations | 236,031 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialRealEstateMember | 225,105 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialRealEstateMember | 201,302 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialRealEstateMember | 144,035 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialRealEstateMember | 222,393 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialRealEstateMember | 203,179 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialRealEstateMember | 157,922 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialRealEstateMember | 126,783 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialRealEstateMember |  |  |
Mortgage Banking [Member] |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Mortgage banking fees | $ 21,406 us-gaap_FeesAndCommissionsMortgageBanking / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialMortgageMember | $ 18,006 us-gaap_FeesAndCommissionsMortgageBanking / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialMortgageMember | $ 17,974 us-gaap_FeesAndCommissionsMortgageBanking / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialMortgageMember | $ 12,123 us-gaap_FeesAndCommissionsMortgageBanking / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialMortgageMember | $ 18,344 us-gaap_FeesAndCommissionsMortgageBanking / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialMortgageMember | $ 21,372 us-gaap_FeesAndCommissionsMortgageBanking / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialMortgageMember | $ 17,682 us-gaap_FeesAndCommissionsMortgageBanking / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialMortgageMember | $ 19,388 us-gaap_FeesAndCommissionsMortgageBanking / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialMortgageMember | $ 69,509 us-gaap_FeesAndCommissionsMortgageBanking / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialMortgageMember | $ 76,786 us-gaap_FeesAndCommissionsMortgageBanking / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialMortgageMember | $ 63,406 us-gaap_FeesAndCommissionsMortgageBanking / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialMortgageMember

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