Variable Interest Entities ("VIEs") - Additional Information (Detail) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2020 USD ($) lot	Jun. 30, 2020 USD ($) lot	Dec. 31, 2019 USD ($)
Variable Interest Entity [Line Items]
Contract land deposits in cash	$ 424,625	$ 424,625	$ 441,423
Contract land deposit reserve adjustment	900	37,300
Loss Reserve On Contract Land Deposits	$ 63,647	$ 63,647	$ 27,572
Variable Interest Entities [Member]
Variable Interest Entity [Line Items]
Maximum range of deposits required under the purchase agreements	10.00%	10.00%
Power of developers equity holders to direct operating activities of development entity	100.00%	100.00%
Lots controlled by NVR | lot	98,600	98,600
Contract land deposits in cash under lot purchase Agreements	$ 423,600	$ 423,600
Letters of credit related to lots	$ 6,400	$ 6,400
Contract on Raw Ground with Landowners [Member]
Variable Interest Entity [Line Items]
Lots controlled by NVR | lot	6,300	6,300
Contract land deposits in cash	$ 1,000	$ 1,000
Letters of credit related to land contract	100	100
Refundable deposits and letters of credit	$ 600	$ 600