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Basis of Presentation - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Contract liability, revenue recognized | $ 91,000 |  |  |  |
Cumulative-effect adjustment from adoption of ASU 2014-09, net of tax |  |  | $ 2,196 |  |
Retained Earnings [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cumulative-effect adjustment from adoption of ASU 2014-09, net of tax |  |  | 2,196 |  |
Other Assets [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Contract cost | 21,500 |  | 19,500 |  |
Home Building [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Customer deposits | 167,676 | $ 172,033 | 150,033 |  |
Restricted cash and cash equivalents | 19,194 |  | 19,438 |  |
Consolidated Joint Venture [Member] | Home Building [Member] | Other Assets [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Restricted cash and cash equivalents | $ 335 |  | $ 1,069 | $ 1,177 | $ 1,214

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