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Segment Disclosures - Assets (Detail) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Dec. 31, 2013
--- | --- | --- | --- | ---
Segment Reporting Asset Reconciling Item [Line Items] |  |  |  |
Assets | $ 2,570,682 | $ 2,351,335 |  |
Cash and cash equivalents | 387,462 | 545,419 | $ 466,293 | $ 866,253
Contract land deposit reserve | (44,532) | (56,074) |  |
Homebuilding [Member] |  |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |  |
Assets | 2,264,314 | 2,088,019 |  |
Consolidated variable interest entity | 1,799 | 3,590 |  |
Cash and cash equivalents | 375,886 | 514,780 |  |
Intangible assets and goodwill | 4,327 | 5,364 |  |
Mortgage Banking [Member] |  |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |  |
Assets | 306,368 | 263,316 |  |
Cash and cash equivalents | 10,407 | 30,158 |  |
Operating Segments [Member] |  |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |  |
Assets | 1,958,656 | 1,615,009 |  |
Operating Segments [Member] | Homebuilding [Member] | Mid Atlantic [Member] |  |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |  |
Assets | 1,094,256 | 917,689 |  |
Operating Segments [Member] | Homebuilding [Member] | North East [Member] |  |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |  |
Assets | 135,579 | 103,631 |  |
Operating Segments [Member] | Homebuilding [Member] | Mid East [Member] |  |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |  |
Assets | 249,269 | 192,781 |  |
Operating Segments [Member] | Homebuilding [Member] | South East [Member] |  |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |  |
Assets | 180,531 | 144,939 |  |
Operating Segments [Member] | Mortgage Banking [Member] |  |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |  |
Assets | 299,021 | 255,969 |  |
Reconciling Items [Member] |  |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |  |
Assets | 612,026 | 736,326 |  |
Consolidated variable interest entity | 1,799 | 3,590 |  |
Cash and cash equivalents | 375,886 | 514,780 |  |
Deferred taxes | 172,032 | 165,189 |  |
Intangible assets and goodwill | 53,254 | 54,291 |  |
Contract land deposit reserve | (44,532) | (56,074) |  |
Consolidation adjustments and other | $ 53,587 | $ 54,550 |  |

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