Variable Interest Entities ("VIEs") - Additional Information (Detail) $ in Thousands	Sep. 30, 2019 USD ($) lot	Dec. 31, 2018 USD ($)
Variable Interest Entity [Line Items]
Contract land deposits in cash	$ 432,494	$ 425,393
Variable Interest Entities [Member]
Variable Interest Entity [Line Items]
Maximum range of deposits required under the purchase agreements	10.00%
Power of developers equity holders to direct operating activities of development entity	100.00%
Lots controlled by NVR | lot	98,150
Contract land deposits in cash under lot purchase Agreements	$ 430,200
Letters of credit related to lots	$ 4,400
Contract on Raw Ground with Landowners [Member]
Variable Interest Entity [Line Items]
Lots controlled by NVR | lot	7,000
Contract land deposits in cash	$ 2,300
Letters of credit related to land contract	100
Refundable deposits and letters of credit	$ 1,400