Joint Ventures - Additional Information (Detail) $ in Thousands	Dec. 31, 2016 USD ($) Lot JointVenture	Dec. 31, 2015 USD ($) Lot JointVenture
Joint Ventures [Line Items]
Aggregate investment | $	$ 49,400	$ 60,500
Number of joint ventures | JointVenture	6	6
Expected production of finished lots | Lot	7,400	8,000
Total lots controlled by company under the joint venture | Lot	4,200	4,700
Total lots either under contract with unrelated parties or not under the current contract | Lot	3,200	3,300
Additional funding commitments in the aggregate | $	$ 6,200	$ 11,500
Number of joint ventures with additional funding commitment | JointVenture	3	3
Number of joint ventures NVR is not primary beneficiary | JointVenture	5
Other Assets [Member]
Joint Ventures [Line Items]
Aggregate investment | $	$ 49,000	$ 59,800