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Land Under Development	6 Months Ended
Land Under Development	Jun. 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 June 30, 2018, NVR directly owned a total of four separate raw land parcels with a carrying value of $35,292 that are expected to produce approximately 450 finished lots. The Company also has additional funding commitments of approximately $8,300 under a joint development agreement related to one parcel, a portion of which the Company expects will be offset by development credits of approximately $4,800. None of the raw parcels had any indicators of impairment as of June 30, 2018.