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Fair Value - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Homebuilding [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Senior Notes carrying value $ 599,166us-gaap_SeniorNotes
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_ResidentialRealEstateMember
$ 599,075us-gaap_SeniorNotes
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Homebuilding [Member] | Senior Notes due 2022 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Senior Notes carrying value 599,166us-gaap_SeniorNotes
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Homebuilding [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Senior Notes due 2022 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Senior Notes fair value 622,800us-gaap_LongTermDebtFairValue
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= us-gaap_ResidentialRealEstateMember
   
Mortgage Banking [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Average basis points of loan amount 1.14%nvr_AverageBasisPointsOfServicingLoanAmount
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Fallout rate of measuring fair value of rate lock commitments 11.00%nvr_FallOutRateOfMeasuringFairValueOfRateLockCommitments
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_ResidentialMortgageMember
   
Fair value of mortgage loans held for sale 205,664us-gaap_LoansHeldForSaleMortgages
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_ResidentialMortgageMember
210,641us-gaap_LoansHeldForSaleMortgages
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Mortgage Banking [Member] | Not Designated as Hedging Instrument [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value adjustment income (expense) 3,305us-gaap_DerivativeGainLossOnDerivativeNet
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3,021us-gaap_DerivativeGainLossOnDerivativeNet
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= us-gaap_ResidentialMortgageMember
(2,431)us-gaap_DerivativeGainLossOnDerivativeNet
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= us-gaap_NondesignatedMember
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= us-gaap_ResidentialMortgageMember
Mortgage Banking [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Rate Lock Commitments [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Notional amount of contractual commitments 237,989invest_DerivativeNotionalAmount
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= us-gaap_InterestRateLockCommitmentsMember
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= us-gaap_ResidentialMortgageMember
   
Mortgage Banking [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Forward Sales Contracts [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Notional amount of contractual commitments 424,966invest_DerivativeNotionalAmount
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Mortgage Banking [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Mortgages Held for Sale [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Notional amount of contractual commitments 203,305invest_DerivativeNotionalAmount
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Change in fair value of loans held for sale $ 2,359us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
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