Variable Interest Entities ("VIEs") - Additional Information (Detail) $ in Thousands |
Sep. 30, 2018
USD ($)
lot
|
Dec. 31, 2017
USD ($)
|
---|---|---|
Variable Interest Entity [Line Items] | ||
Contract land deposits in cash | $ 402,318 | $ 400,428 |
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 | 92,350 | |
Contract land deposits in cash under lot purchase Agreements | $ 398,800 | |
Letters of credit related to lots | $ 3,800 | |
Contract on Raw Ground with Landowners [Member] | ||
Variable Interest Entity [Line Items] | ||
Lots controlled by NVR | lot | 7,800 | |
Contract land deposits in cash | $ 3,500 | |
Letters of credit related to land contract | 100 | |
Refundable deposits and letters of credit | $ 1,300 |