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Segment Information, Nature of Operations, and Certain Concentrations - Depreciation and Amortization (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 depreciation and amortization | $ 22,667 | $ 22,269 | $ 21,534
Profit before taxes: |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Consolidated depreciation and amortization | 17,547 | 17,283 | 16,777
Profit before taxes: | Homebuilding: | Mid Atlantic |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Consolidated depreciation and amortization | 8,095 | 8,089 | 7,876
Profit before taxes: | Homebuilding: | North East |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Consolidated depreciation and amortization | 2,034 | 2,053 | 1,571
Profit before taxes: | Homebuilding: | Mid East |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Consolidated depreciation and amortization | 3,590 | 3,748 | 4,003
Profit before taxes: | Homebuilding: | South East |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Consolidated depreciation and amortization | 2,531 | 2,276 | 2,191
Profit before taxes: | Mortgage Banking: |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Consolidated depreciation and amortization | 1,297 | 1,117 | 1,136
Other unallocated interest income |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Consolidated depreciation and amortization | $ 5,120 | $ 4,986 | $ 4,757

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- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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