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Variable Interest Entities - Total Risk of Loss Related to Contract Land Deposits (Parenthetical) (Detail) - Lot | Dec. 31, 2016 | Dec. 31, 2015
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Variable Interest Entity Reporting Entity Involvement Maximum Loss Exposure [Abstract] |  |
Finished lots committed to purchase under specific performance obligations | 10 | 10

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

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