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Segment Information, Nature of Operations, and Certain Concentrations - Interest Expense (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Consolidated interest expense | $ 24,185 | $ 21,707 | $ 23,559
Homebuilding: |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Consolidated interest expense | 23,037 | 20,621 | 22,918
Mortgage Banking: |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Consolidated interest expense | 1,148 | 1,086 | 641
Profit before taxes: |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Consolidated interest expense | 199,586 | 191,146 | 171,860
Profit before taxes: | Homebuilding: | Mid Atlantic |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Consolidated interest expense | 123,075 | 119,808 | 107,748
Profit before taxes: | Homebuilding: | North East |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Consolidated interest expense | 16,117 | 18,141 | 16,991
Profit before taxes: | Homebuilding: | Mid East |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Consolidated interest expense | 29,663 | 28,307 | 27,263
Profit before taxes: | Homebuilding: | South East |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Consolidated interest expense | 29,583 | 23,804 | 19,217
Profit before taxes: | Mortgage Banking: |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Consolidated interest expense | 1,148 | 1,086 | 641
Reconciling items: |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Consolidated interest expense | 22,983 | 20,553 | 22,869
Corporate capital allocation charge | 198,384 | 189,992 | 171,170
Reconciling items: | Homebuilding: | Mid Atlantic |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Corporate capital allocation charge | 123,028 | 119,758 | 107,705
Reconciling items: | Homebuilding: | North East |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Corporate capital allocation charge | 16,115 | 18,132 | 16,987
Reconciling items: | Homebuilding: | Mid East |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Corporate capital allocation charge | 29,663 | 28,303 | 27,263
Reconciling items: | Homebuilding: | South East |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Corporate capital allocation charge | $ 29,578 | $ 23,799 | $ 19,215

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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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