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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Significant Accounting Policies [Line Items] |  |  |  |
Cash | $ 2,809,782 | $ 1,160,804 | $ 732,248 | $ 689,557
Contract land deposit assets impairment valuation allowances | 52,205 | 27,572 |  |
Net Contract Land Deposit Impairment Recoveries | $ 25,600 | (700) | $ 5,100 |
Office facilities and other | Maximum |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Property, Plant and Equipment, Useful Life | 10 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 | $ 2,714,720 | 1,110,892 |  |
Goodwill acquired from business acquisition | 41,580 | 41,580 |  |
Contract with Customer, Liability | 240,758 | 131,886 |  |
Mortgage Banking |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Cash | 63,547 | 29,412 |  |
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 | $ 617,308 |  |  |
Mortgage Banking | Level 2 | Fair Value, Measurements, Recurring | Forward sales contracts |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Derivative, Notional Amount | 916,588 |  |  |
Consolidated Joint Venture |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Cash | 269 | 281 |  |
Other Assets |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Capitalized Contract Cost, Net | $ 22,500 | $ 14,600 |  |

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