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Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Other Assets |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Contract cost | $ 24,300 | $ 22,500 |  |
Home Building Segment |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Restricted cash and cash equivalents | 41,820 | 28,912 |  |
Contract liabilities for customer deposits | 381,594 | 240,758 |  |
Consolidated Joint Venture | Home Building Segment | Other Assets |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Restricted cash and cash equivalents | $ 271 | $ 269 | $ 271 | $ 281

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