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Joint Ventures - Additional Information (Detail) $ in Thousands | Sep. 30, 2021 USD ($) lot joint_venture | Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2019 USD ($)
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Joint Ventures [Line Items] |  |  |  |
Aggregate investment | $ 20,800 |  |  |
Number of joint ventures | joint_venture | 4 |  |  |
Expected production of finished lots | lot | 2,300 |  |  |
Total lots controlled by company under the joint venture | lot | 1,950 |  |  |
Total lots either under contract with unrelated parties or not under the current contract | lot | 350 |  |  |
Additional funding commitments in the aggregate | $ 2,900 |  |  |
Number of joint ventures NVR is not primary beneficiary | joint_venture | 3 |  |  |
Other Assets |  |  |  |
Joint Ventures [Line Items] |  |  |  |
Aggregate investment | $ 20,800 | $ 23,600 |  |
Home Building Segment |  |  |  |
Joint Ventures [Line Items] |  |  |  |
Restricted cash and cash equivalents | 41,820 | 28,912 |  |
Accrued expenses and other liabilities | 416,266 | 440,671 |  |
Consolidated Joint Venture | Home Building Segment | Other Assets |  |  |  |
Joint Ventures [Line Items] |  |  |  |
Restricted cash and cash equivalents | 271 | $ 269 | $ 271 | $ 281
Consolidated Joint Venture | Home Building Segment | Accounts Payable and Accrued Liabilities |  |  |  |
Joint Ventures [Line Items] |  |  |  |
Accrued expenses and other liabilities | $ 250 |  |  |

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