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Segment Information, Nature of Operations, and Certain Concentrations - Profit before Taxes (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013
Segment Reporting [Abstract] |
Pre-tax compensation expense reversal attributable to an adjustment of the option forfeiture rates | $ 7,900 nvr_IncreaseDecreaseInShareBasedCompensationExpenseDueToChangeInEstimatedForfeitureRate

X
- Definition Increase decrease in share-based compensation expense due to change in estimated forfeiture rate. + References No definition available. + Details
Name: | nvr_IncreaseDecreaseInShareBasedCompensationExpenseDueToChangeInEstimatedForfeitureRate
Namespace Prefix: | nvr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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