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Segment Information, Nature of Operations, and Certain Concentrations - Expenditures for Property and Equipment (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Expenditures for property and equipment: | $ 16,119 | $ 22,699 | $ 19,665
Profit before taxes: |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Expenditures for property and equipment: | 15,919 | 21,282 | 16,442
Profit before taxes: | Home Building | Mid Atlantic |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Expenditures for property and equipment: | 5,712 | 9,218 | 6,657
Profit before taxes: | Home Building | North East |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Expenditures for property and equipment: | 1,083 | 2,000 | 1,074
Profit before taxes: | Home Building | Mid East |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Expenditures for property and equipment: | 5,041 | 5,221 | 4,302
Profit before taxes: | Home Building | South East |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Expenditures for property and equipment: | 3,818 | 3,944 | 2,732
Profit before taxes: | Mortgage Banking |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Expenditures for property and equipment: | 265 | 899 | 1,677
Other unallocated interest income |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Expenditures for property and equipment: | $ 200 | $ 1,417 | $ 3,223

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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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