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Commitments and Contingent Liabilities - Summary of Changes in Product Warranty/Liability Reserve (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Product Warranties Disclosures [Abstract]      
Warranty reserve, beginning of year $ 101,507us-gaap_ProductWarrantyAccrual $ 62,742us-gaap_ProductWarrantyAccrual $ 64,008us-gaap_ProductWarrantyAccrual
Provision 51,668nvr_CostsAccruedForNewWarrantyContractsAndChangesInEstimatesForPreExistingWarranties 82,860nvr_CostsAccruedForNewWarrantyContractsAndChangesInEstimatesForPreExistingWarranties 41,138nvr_CostsAccruedForNewWarrantyContractsAndChangesInEstimatesForPreExistingWarranties
Payments (59,115)us-gaap_ProductWarrantyAccrualPayments (44,095)us-gaap_ProductWarrantyAccrualPayments (42,404)us-gaap_ProductWarrantyAccrualPayments
Warranty reserve, end of year $ 94,060us-gaap_ProductWarrantyAccrual $ 101,507us-gaap_ProductWarrantyAccrual $ 62,742us-gaap_ProductWarrantyAccrual