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Equity-Based Compensation, Profit Sharing and Deferred Compensation Plans - Equity-Based Compensation Plans (Parenthetical) (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Restricted share grants exercise price | $ 0 nvr_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageExercisePrice

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- Definition Share based compensation arrangement by share based payment award equity instruments other than options grants in period weighted average exercise price. + References No definition available. + Details
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