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Related Party Transactions	12 Months Ended
Related Party Transactions	Dec. 31, 2018
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions During the year ended December 31, 2018, NVR entered into Lot Purchase Agreements to purchase finished building lots for a total purchase price of approximately $121,700 with Elm Street Development, Inc. (“Elm Street”), which is controlled by one of the Company’s directors, William Moran. The independent members of the Company’s Board of Directors approved these transactions. During 2018, 2017 and 2016, NVR purchased developed lots at market prices from Elm Street for approximately $36,100, $37,100 and $44,500, respectively. The Company also continues to control a parcel of raw land expected to yield approximately 2,300 finished lots through a JV entered into with Elm Street during 2009. NVR did not make any investments in the JV in 2018. During 2017, NVR and Elm Street each made an additional investment of $2,900 in the JV. Further, during 2016, the Company paid Elm Street $143 to manage the development of a property that the Company purchased from Elm Street in 2010. No management fees were paid to Elm Street in 2018 or 2017 related to this property.