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Joint Ventures - Additional Information (Detail) $ in Thousands | Jun. 30, 2020 USD ($) lot joint_venture | Dec. 31, 2019 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($)
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Joint Ventures [Line Items] |  |  |  |
Aggregate investment | $ 28,400 |  |  |
Number of joint ventures | joint_venture | 4 |  |  |
Expected production of finished lots | lot | 6,150 |  |  |
Total lots controlled by company under the joint venture | lot | 2,800 |  |  |
Total lots either under contract with unrelated parties or not under the current contract | lot | 3,350 |  |  |
Additional funding commitments in the aggregate | $ 4,200 |  |  |
Number of joint ventures with additional funding commitment | joint_venture | 1 |  |  |
Number of joint ventures NVR is not primary beneficiary | joint_venture | 3 |  |  |
Other Assets [Member] |  |  |  |
Joint Ventures [Line Items] |  |  |  |
Aggregate investment | $ 28,400 | $ 26,700 |  |
Home Building [Member] |  |  |  |
Joint Ventures [Line Items] |  |  |  |
Restricted cash and cash equivalents | 24,650 | 17,943 |  |
Accrued expenses and other liabilities | 349,113 | 346,035 |  |
Consolidated Joint Venture [Member] | Home Building [Member] | Other Assets [Member] |  |  |  |
Joint Ventures [Line Items] |  |  |  |
Restricted cash and cash equivalents | 272 | $ 281 | $ 294 | $ 320
Consolidated Joint Venture [Member] | Home Building [Member] | Accounts Payable and Accrued Liabilities [Member] |  |  |  |
Joint Ventures [Line Items] |  |  |  |
Accrued expenses and other liabilities | $ 248 |  |  |

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