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Product Warranties - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2014
Product Warranties Disclosures [Abstract] |  |  |
Warranty reserve provision related to single completed community |  | $ 3,000 | $ 3,975
Warranty reserve provision reversed related to single completed community | $ 1,300 |  |

X
- Definition The warranty reserve provision charge related to remediation of primarily water infiltration issues in a single completed community. + References No definition available. + Details
Name: | nvr_WarrantyReserveProvisionSingleCompletedCommunity
Namespace Prefix: | nvr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The reversal of the previously recognized warranty reserve provision charge, which is related to the remediation of primarily water infiltration issues in a single completed community. + References No definition available. + Details
Name: | nvr_WarrantyReserveProvisionWrittenOffSingleCompletedCommunity
Namespace Prefix: | nvr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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