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Land Under Development	12 Months Ended
Land Under Development	Dec. 31, 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 December 31, 2018, NVR directly owned three separate raw parcels of land with a carrying value of $38,857 that it intends to develop into approximately 500 finished lots primarily for use in its homebuilding operations. The Company also has additional funding commitments of approximately $7,300 under a joint development agreement related to one parcel, a portion of which the Company expects will be offset by development credits of approximately $4,600. None of the raw parcels had any indicators of impairment as of December 31, 2018. As of December 31, 2017, NVR directly owned four separate raw parcels of land with a carrying value of $34,212, which were expected to produce approximately 500 finished lots.