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Variable Interest Entities and Joint Ventures (Details 1) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
--- | --- | --- | ---
The condensed balance sheet of the consolidated JV |  |  |
Cash | $ 462 | $ 358 |
Restricted Cash | 503 | 501 |
Other Assets | 125 | 126 |
Land under development | 19,092 | 21,386 |
Total assets | 20,182 | 22,371 | 70,430
Debt | 4,983 | 7,592 |
Accrued expenses | 108 | 59 |
Equity | 15,091 | 14,720 |
Total liabilities and shareholders' equity | $ 20,182 | $ 22,371 |

X
- Definition Accrued expenses related to consolidated joint venture. + References No definition available. + Details
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Namespace Prefix: | nvr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Cash related to consolidated joint venture. + References No definition available. + Details
Name: | nvr_CashRelatedToConsolidatedJointVenture
Namespace Prefix: | nvr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: | nvr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Equity related to consolidated joint venture. + References No definition available. + Details
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Namespace Prefix: | nvr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Land under development related to consolidated joint venture. + References No definition available. + Details
Name: | nvr_LandUnderDevelopmentRelatedToConsolidatedJointVenture
Namespace Prefix: | nvr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Non-recourse debt related to consolidated joint venture. + References No definition available. + Details
Name: | nvr_NonRecourseDebtRelatedToConsolidatedJointVenture
Namespace Prefix: | nvr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Other assets related to consolidated joint venture. + References No definition available. + Details
Name: | nvr_OtherAssetsRelatedToConsolidatedJointVenture
Namespace Prefix: | nvr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Restricted cash related to consolidated joint venture. + References No definition available. + Details
Name: | nvr_RestrictedCashRelatedToConsolidatedJointVenture
Namespace Prefix: | nvr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The carrying amount of the consolidated joint venture's liability and equity included in the reporting entity's statement of financial position. + References No definition available. + Details
Name: | nvr_VariableInterestEntityConsolidatedCarryingAmountLiabilitiesAndEquity
Namespace Prefix: | nvr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The carrying amount of the consolidated Variable Interest Entity's assets included in the reporting entity's statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=6970148&loc=d3e5710-111685 + Details
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Namespace Prefix: | us-gaap_
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Period Type: | instant