Segment Information, Nature of Operations, and Certain Concentrations - Depreciation and Amortization (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting, Other Significant Reconciling Item [Line Items]
Consolidated depreciation and amortization	$ 16,916	$ 17,396	$ 19,463
Profit before taxes:
Segment Reporting, Other Significant Reconciling Item [Line Items]
Consolidated depreciation and amortization	15,277	15,315	16,678
Profit before taxes: | Home Building | Mid Atlantic
Segment Reporting, Other Significant Reconciling Item [Line Items]
Consolidated depreciation and amortization	5,914	5,923	6,183
Profit before taxes: | Home Building | North East
Segment Reporting, Other Significant Reconciling Item [Line Items]
Consolidated depreciation and amortization	1,125	1,216	1,628
Profit before taxes: | Home Building | Mid East
Segment Reporting, Other Significant Reconciling Item [Line Items]
Consolidated depreciation and amortization	3,724	3,948	4,259
Profit before taxes: | Home Building | South East
Segment Reporting, Other Significant Reconciling Item [Line Items]
Consolidated depreciation and amortization	3,218	3,093	3,325
Profit before taxes: | Mortgage Banking
Segment Reporting, Other Significant Reconciling Item [Line Items]
Consolidated depreciation and amortization	1,296	1,135	1,283
Other unallocated interest income
Segment Reporting, Other Significant Reconciling Item [Line Items]
Consolidated depreciation and amortization	$ 1,639	$ 2,081	$ 2,785