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Equity-Based Compensation, Profit Sharing and Deferred Compensation Plans - Exercised Option Proceeds (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]      
Aggregate exercise proceeds $ 76,153us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions [1] $ 14,834us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions [1] $ 73,211us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions [1]
Aggregate intrinsic value on exercise dates $ 62,136us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue $ 84,908us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue $ 101,334us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
[1] Aggregate exercise proceeds include the Option exercise price received in cash or the fair market value of NVR stock surrendered by the optionee in lieu of cash.