Variable Interest Entities - Additional Information (Detail) $ in Thousands	Dec. 31, 2019 USD ($) lot	Dec. 31, 2018 USD ($)
Variable Interest Entity [Line Items]
Maximum range of deposits required under the purchase agreements	10.00%
Contract land deposits in cash	$ 441,423	$ 425,393
Variable Interest Entities
Variable Interest Entity [Line Items]
Maximum range of deposits required under the purchase agreements	10.00%
Lots controlled by NVR | lot	101,300
Contract land deposits in cash under Lot Purchase Agreements	$ 439,500
Letters of credit related to lots	$ 5,500
Contract on Raw Ground with Landowners
Variable Interest Entity [Line Items]
Lots controlled by NVR | lot	7,000
Contract land deposits in cash	$ 1,900
Letters of credit on raw land contracts	100
Refundable deposits	$ 900