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Shareholders' Equity - Additional Information (Detail) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015
Equity [Abstract] |
Common stock repurchased | 50 us-gaap_TreasuryStockSharesAcquired
Treasury stock issued upon Option exercise and RSUs vesting | 64 nvr_StockIssuedDuringPeriodSharesTreasuryStockReissuedUponExerciseOfStockOptionAndOther

X
- 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
Name: | nvr_StockIssuedDuringPeriodSharesTreasuryStockReissuedUponExerciseOfStockOptionAndOther
Namespace Prefix: | nvr_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_EquityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of shares that have been repurchased during the period and are being held in treasury. + 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
Name: | us-gaap_TreasuryStockSharesAcquired
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration