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Common Stock - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 180 Months Ended 252 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2014
Dec. 31, 2014
Statement Of Stockholders Equity [Abstract]          
Common shares outstanding 4,049us-gaap_CommonStockSharesOutstanding 4,434us-gaap_CommonStockSharesOutstanding   4,049us-gaap_CommonStockSharesOutstanding 4,049us-gaap_CommonStockSharesOutstanding
Treasury stock repurchases, shares 508us-gaap_TreasuryStockSharesAcquired 581us-gaap_TreasuryStockSharesAcquired 286us-gaap_TreasuryStockSharesAcquired   23,800us-gaap_TreasuryStockSharesAcquired
Treasury stock repurchases, value $ 567,544us-gaap_TreasuryStockValueAcquiredCostMethod $ 554,491us-gaap_TreasuryStockValueAcquiredCostMethod $ 227,281us-gaap_TreasuryStockValueAcquiredCostMethod   $ 5,876,000us-gaap_TreasuryStockValueAcquiredCostMethod
Reissued shares during the period, shares 123nvr_StockIssuedDuringPeriodSharesTreasuryStockReissuedUponExerciseOfStockOptionAndOther 102nvr_StockIssuedDuringPeriodSharesTreasuryStockReissuedUponExerciseOfStockOptionAndOther 222nvr_StockIssuedDuringPeriodSharesTreasuryStockReissuedUponExerciseOfStockOptionAndOther 7,287nvr_StockIssuedDuringPeriodSharesTreasuryStockReissuedUponExerciseOfStockOptionAndOther