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Segment Information, Nature of Operations, and Certain Concentrations - Interest Expense (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Consolidated interest expense | $ 23,559 | $ 23,140 | $ 22,385
Homebuilding [Member] |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Consolidated interest expense | 22,918 | 22,591 | 21,840
Mortgage Banking [Member] |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Consolidated interest expense | 641 | 549 | 545
Operating Segments [Member] |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Consolidated interest expense | 171,860 | 152,736 | 117,100
Operating Segments [Member] | Homebuilding [Member] | Mid Atlantic [Member] |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Consolidated interest expense | 107,748 | 96,364 | 72,351
Operating Segments [Member] | Homebuilding [Member] | North East [Member] |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Consolidated interest expense | 16,991 | 12,114 | 9,466
Operating Segments [Member] | Homebuilding [Member] | Mid East [Member] |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Consolidated interest expense | 27,263 | 26,300 | 22,587
Operating Segments [Member] | Homebuilding [Member] | South East [Member] |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Consolidated interest expense | 19,217 | 17,409 | 12,151
Operating Segments [Member] | Mortgage Banking [Member] |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Consolidated interest expense | 641 | 549 | 545
Reconciling Items [Member] |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Consolidated interest expense | 22,869 | 22,544 | 21,743
Corporate capital allocation | (171,170) | (152,140) | (116,458)
Reconciling Items [Member] | Homebuilding [Member] | Mid Atlantic [Member] |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Corporate capital allocation | (107,705) | (96,328) | (72,272)
Reconciling Items [Member] | Homebuilding [Member] | North East [Member] |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Corporate capital allocation | (16,987) | (12,107) | (9,461)
Reconciling Items [Member] | Homebuilding [Member] | Mid East [Member] |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Corporate capital allocation | (27,263) | (26,299) | (22,580)
Reconciling Items [Member] | Homebuilding [Member] | South East [Member] |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Corporate capital allocation | $ (19,215) | $ (17,406) | $ (12,145)

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- Definition Amount of the cost of borrowed funds accounted for as interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.9) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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