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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Significant Accounting Policies [Line Items] |  |  |
Loss reserve on contract land deposits | $ 30,041 | $ 52,205 |
Net Contract Land Deposit Impairment Recoveries | $ 22,100 | (25,600) | $ 700
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration] | Accrued Liabilities [Member] |  |
Office facilities and other | Minimum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 3 years |  |
Office facilities and other | Maximum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 10 years |  |
Manufacturing Facilities | Minimum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 5 years |  |
Manufacturing Facilities | Maximum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 40 years |  |
Home Building |  |  |
Significant Accounting Policies [Line Items] |  |  |
Cash | $ 2,545,069 | 2,714,720 |
Goodwill acquired from business acquisition | 41,580 | 41,580 |
Contract with Customer, Liability | 417,463 | 240,758 |
Mortgage Banking |  |  |
Significant Accounting Policies [Line Items] |  |  |
Cash | 28,398 | 63,547 |
Goodwill acquired from business acquisition | $ 7,347 | 7,347 |
Mortgage Banking | Level 2 | Fair Value, Measurements, Recurring |  |  |
Significant Accounting Policies [Line Items] |  |  |
Typical length of days loans sold into secondary market | 30 days |  |
Mortgage Banking | Level 2 | Fair Value, Measurements, Recurring | Rate lock commitments |  |  |
Significant Accounting Policies [Line Items] |  |  |
Derivative, Notional Amount | $ 1,028,451 |  |
Mortgage Banking | Level 2 | Fair Value, Measurements, Recurring | Forward sales contracts |  |  |
Significant Accounting Policies [Line Items] |  |  |
Derivative, Notional Amount | 1,184,999 |  |
Consolidated Joint Venture |  |  |
Significant Accounting Policies [Line Items] |  |  |
Cash | 268 | 269 |
Other Assets |  |  |
Significant Accounting Policies [Line Items] |  |  |
Capitalized Contract Cost, Net | $ 25,200 | $ 22,500 |

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