Variable Interest Entities ("VIEs") - Additional Information (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($) lot	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) lot	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Variable Interest Entity [Line Items]
Contract land deposit reserve adjustment	$ 4,100	$ (4,800)	$ 17,500	$ 32,500
Loss reserve on contract land deposits	34,704		34,704		$ 52,205
Contract land deposits in cash	$ 487,959		$ 487,959		$ 439,833
Variable Interest Entities
Variable Interest Entity [Line Items]
Maximum range of deposits required under the purchase agreements	10.00%		10.00%
Lots controlled by NVR | lot	116,550		116,550
Contract land deposits in cash under lot purchase Agreements	$ 483,600		$ 483,600
Letters of credit related to lots	$ 10,700		$ 10,700
Contract on Raw Ground with Landowners
Variable Interest Entity [Line Items]
Lots controlled by NVR | lot	12,500		12,500
Contract land deposits in cash	$ 4,400		$ 4,400
Letters of credit related to land contract	100		100
Refundable deposits and letters of credit	$ 3,300		$ 3,300