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Segment Information, Nature of Operations, and Certain Concentrations - Expenditures for Property and Equipment (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Expenditures for property and equipment: | $ 20,269 | $ 22,369 | $ 18,277
Profit before taxes: |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Expenditures for property and equipment: | 19,709 | 20,608 | 16,299
Profit before taxes: | Homebuilding: | Mid Atlantic |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Expenditures for property and equipment: | 9,257 | 8,838 | 8,287
Profit before taxes: | Homebuilding: | North East |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Expenditures for property and equipment: | 1,299 | 3,423 | 2,220
Profit before taxes: | Homebuilding: | Mid East |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Expenditures for property and equipment: | 3,117 | 4,027 | 3,774
Profit before taxes: | Homebuilding: | South East |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Expenditures for property and equipment: | 3,313 | 3,594 | 1,753
Profit before taxes: | Mortgage Banking: |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Expenditures for property and equipment: | 2,723 | 726 | 265
Other unallocated interest income |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Expenditures for property and equipment: | $ 560 | $ 1,761 | $ 1,978

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- Definition Amount of acquisition of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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