XML 33 R30.htm IDEA: XBRL DOCUMENT
v3.3.0.814

Variable Interest Entities - Total Risk of Loss Related to Contract Land Deposits (Parenthetical) (Detail) - Lot | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Variable Interest Entity Reporting Entity Involvement Maximum Loss Exposure [Abstract] |  |
Finished lots committed to purchase under specific performance obligations | 10 | 10

X
- Definition Finished lots committed to purchase under specific performance obligations. + References No definition available. + Details
Name: | nvr_FinishedLotsCommittedToPurchase
Namespace Prefix: | nvr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_VariableInterestEntityReportingEntityInvolvementMaximumLossExposureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration