Joint Ventures - Additional Information (Detail) $ in Thousands	Sep. 30, 2015 USD ($) Lot JointVenture	Dec. 31, 2014 USD ($)
Joint Ventures [Line Items]
Aggregate investment	$ 63,700
Number of joint ventures | JointVenture	5
Expected production of finished lots | Lot	8,100
Total lots not under contract with NVR under the joint venture | Lot	3,300
Additional funding commitments in the aggregate	$ 6,800
Number of joint ventures with additional funding commitment | JointVenture	2
Number of joint ventures NVR is not primary beneficiary | JointVenture	4
Other Assets [Member]
Joint Ventures [Line Items]
Aggregate investment	$ 63,500	$ 80,100