Joint Ventures - Additional Information (Detail) $ in Thousands	Jun. 30, 2015 USD ($) Lot JointVenture	Dec. 31, 2014 USD ($)
Joint Ventures [Line Items]
Aggregate investment | $	$ 68,500
Number of joint ventures	5
Expected production of finished lots | Lot	8,300
Total lots not under contract with NVR under the joint venture | Lot	3,300
Additional funding commitments in the aggregate | $	$ 12,100
Number of joint ventures with additional funding commitment	3
Number of joint ventures NVR is not primary beneficiary	4
Other Assets [Member]
Joint Ventures [Line Items]
Aggregate investment | $	$ 67,300	$ 80,100