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Segment Information, Nature of Operations, and Certain Concentrations - Depreciation and Amortization (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Consolidated depreciation and amortization | $ 22,269 | $ 21,534 | $ 17,614
Operating Segments [Member] |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Consolidated depreciation and amortization | 17,283 | 16,777 | 13,713
Operating Segments [Member] | Homebuilding [Member] | Mid Atlantic [Member] |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Consolidated depreciation and amortization | 8,089 | 7,876 | 6,489
Operating Segments [Member] | Homebuilding [Member] | North East [Member] |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Consolidated depreciation and amortization | 2,053 | 1,571 | 1,208
Operating Segments [Member] | Homebuilding [Member] | Mid East [Member] |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Consolidated depreciation and amortization | 3,748 | 4,003 | 3,212
Operating Segments [Member] | Homebuilding [Member] | South East [Member] |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Consolidated depreciation and amortization | 2,276 | 2,191 | 1,715
Operating Segments [Member] | Mortgage Banking [Member] |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Consolidated depreciation and amortization | 1,117 | 1,136 | 1,089
Consolidation adjustments and other [Member] |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Consolidated depreciation and amortization | $ 4,986 | $ 4,757 | $ 3,901

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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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