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Basis of Presentation - Additional Information (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Operating Lease, Liability | $ 86,199 | $ 86 |  |  |
Cumulative-effect adjustment from adoption of ASU 2014-09, net of tax |  |  |  |  | $ 2,196
Operating Lease, Right-of-Use Asset |  | $ 79 |  |  |
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 | 16,300 |  | $ 17,000 |  |
Home Building [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Operating Lease, Liability | 72,965 |  | 0 |  |
Customer deposits | 142,634 |  | 138,246 |  |
Restricted cash and cash equivalents | 19,609 |  | 16,982 |  |
Operating Lease, Right-of-Use Asset | 65,519 |  | 0 |  |
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 | $ 300 |  | $ 320 | $ 1,148 | $ 1,069

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