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Segment Information, Nature of Operations, and Certain Concentrations - Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Assets | $ 2,989,279 | $ 2,643,943 |  |
Cash and cash equivalents | 667,863 | 396,619 | $ 425,316 | $ 545,419
Contract land deposit reserve | (29,999) | (31,306) |  |
Homebuilding: |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Assets | 2,584,880 | 2,233,346 |  |
Cash and cash equivalents | 645,087 | 375,748 |  |
Deferred taxes | 111,953 | 170,652 |  |
Mortgage Banking: |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Assets | 404,399 | 410,597 |  |
Cash and cash equivalents | 21,707 | 19,657 |  |
Profit before taxes: |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Assets | 2,160,009 | 2,021,710 |  |
Profit before taxes: | Homebuilding: | Mid Atlantic |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Assets | 1,079,225 | 1,054,779 |  |
Profit before taxes: | Homebuilding: | North East |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Assets | 143,008 | 126,720 |  |
Profit before taxes: | Homebuilding: | Mid East |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Assets | 263,019 | 222,736 |  |
Profit before taxes: | Homebuilding: | South East |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Assets | 277,705 | 214,225 |  |
Profit before taxes: | Mortgage Banking: |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Assets | 397,052 | 403,250 |  |
Reconciling items: |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Assets | 829,270 | 622,233 |  |
Cash and cash equivalents | 645,087 | 375,748 |  |
Deferred taxes | 111,953 | 170,652 |  |
Intangible assets and goodwill | 50,144 | 51,526 |  |
Contract land deposit reserve | (29,999) | (31,306) |  |
Consolidation adjustments and other | $ 52,085 | $ 55,613 |  |

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