Variable Interest Entities ("VIEs") - Additional Information (Detail) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($) lot	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) lot	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Variable Interest Entity [Line Items]
Contract land deposit reserve adjustment	$ 7,200		$ 13,400
Net Contract Land Deposit Impairment Recoveries		$ 900		$ 37,300
Loss reserve on contract land deposits	38,831		38,831		$ 52,205
Contract land deposits in cash	$ 464,132		$ 464,132		$ 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	112,000		112,000
Contract land deposits in cash under lot purchase Agreements	$ 460,900		$ 460,900
Letters of credit related to lots	$ 6,900		$ 6,900
Contract on Raw Ground with Landowners
Variable Interest Entity [Line Items]
Lots controlled by NVR | lot	9,000		9,000
Contract land deposits in cash	$ 3,200		$ 3,200
Letters of credit related to land contract	100		100
Refundable deposits and letters of credit	$ 2,800		$ 2,800