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Segment Information, Nature of Operations, and Certain Concentrations - Interest Expense (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Consolidated interest expense | $ 21,707 | $ 23,559 | $ 23,140
Homebuilding [Member] |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Consolidated interest expense | 20,621 | 22,918 | 22,591
Mortgage Banking [Member] |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Consolidated interest expense | 1,086 | 641 | 549
Operating Segments [Member] |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Consolidated interest expense | 191,146 | 171,860 | 152,736
Operating Segments [Member] | Homebuilding [Member] | Mid Atlantic [Member] |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Consolidated interest expense | 119,808 | 107,748 | 96,364
Operating Segments [Member] | Homebuilding [Member] | North East [Member] |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Consolidated interest expense | 18,141 | 16,991 | 12,114
Operating Segments [Member] | Homebuilding [Member] | Mid East [Member] |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Consolidated interest expense | 28,307 | 27,263 | 26,300
Operating Segments [Member] | Homebuilding [Member] | South East [Member] |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Consolidated interest expense | 23,804 | 19,217 | 17,409
Operating Segments [Member] | Mortgage Banking [Member] |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Consolidated interest expense | 1,086 | 641 | 549
Reconciling Items [Member] |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Consolidated interest expense | 20,553 | 22,869 | 22,544
Corporate capital allocation | (189,992) | (171,170) | (152,140)
Reconciling Items [Member] | Homebuilding [Member] | Mid Atlantic [Member] |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Corporate capital allocation | (119,758) | (107,705) | (96,328)
Reconciling Items [Member] | Homebuilding [Member] | North East [Member] |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Corporate capital allocation | (18,132) | (16,987) | (12,107)
Reconciling Items [Member] | Homebuilding [Member] | Mid East [Member] |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Corporate capital allocation | (28,303) | (27,263) | (26,299)
Reconciling Items [Member] | Homebuilding [Member] | South East [Member] |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Corporate capital allocation | $ (23,799) | $ (19,215) | $ (17,406)

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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 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 Reference 3: 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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