Equity-Based Compensation, Profit Sharing and Deferred Compensation Plans - Equity-Based Compensation Plans (Parenthetical) (Detail) (USD $)	12 Months Ended
Dec. 31, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Restricted share grants exercise price	$ 0

Share based compensation arrangement by share based payment award equity instruments other than options grants in period weighted average exercise price.

No definition available.

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Namespace Prefix:	nvr_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration