Equity-Based Compensation, Profit Sharing and Deferred Compensation Plans - Exercised Option Proceeds (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Aggregate exercise proceeds	[1]	$ 38,106	$ 85,948	$ 76,153
Aggregate intrinsic value on exercise dates		$ 96,600	$ 99,288	$ 62,136

[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.