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Commitments and Contingent Liabilities - Future Minimum Lease Payments under Operating Leases (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Commitments And Contingencies Disclosure [Abstract]  
2015 $ 24,012us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent
2016 17,352us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears
2017 15,024us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears
2018 11,654us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears
2019 11,155us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears
Thereafter 28,092us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter
Subtotal 107,289us-gaap_OperatingLeasesFutureMinimumPaymentsDue
Sublease income (282)us-gaap_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals
Total minimum lease payments $ 107,007nvr_OperatingLeasesFutureMinimumPaymentsDueLessSubleaseRentals