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

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- Definition Number of treasury shares reissued during the period to satisfy equity-based compensation obligations exercised by the holders of such rights. + References No definition available. + Details
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- Definition Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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