XML 82 R51.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Debt - Additional Information (Detail) | 12 Months Ended
--- | ---
Dec. 31, 2012
Debt Instrument [Line Items] |
Repurchase facility minimum pricing rate | 3.10%

X
- Definition Minimum pricing rate of outstanding repurchase facility borrowings. + References No definition available. + Details
Name: | nvr_MinimumPricingRateOfOutstandingRepurchaseFacilityBorrowings
Namespace Prefix: | nvr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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