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Land Under Development	9 Months Ended
Land Under Development	Sep. 30, 2018
Real Estate [Abstract]
Land Under Development	Land Under Development On a limited basis, NVR directly acquires raw land parcels already zoned for its intended use to develop into finished lots. Land under development includes the land acquisition costs, direct improvement costs, capitalized interest where applicable, and real estate taxes. As of September 30, 2018, NVR directly owned a total of three separate raw land parcels with a carrying value of $36,064 that are expected to produce approximately 500 finished lots. The Company also has additional funding commitments of approximately $7,900 under a joint development agreement related to one parcel, a portion of which the Company expects will be offset by development credits of approximately $4,700. None of the raw parcels had any indicators of impairment as of September 30, 2018.