Segment Information, Nature of Operations, and Certain Concentrations - Expenditures for Property and Equipment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Other Significant Reconciling Item [Line Items]
Consolidated expenditures for property and equipment	$ 18,277	$ 31,672	$ 19,016
Operating Segments [Member]
Segment Reporting Other Significant Reconciling Item [Line Items]
Consolidated expenditures for property and equipment	16,299	24,392	18,278
Operating Segments [Member] | Homebuilding [Member] | Mid Atlantic [Member]
Segment Reporting Other Significant Reconciling Item [Line Items]
Consolidated expenditures for property and equipment	8,287	9,047	7,947
Operating Segments [Member] | Homebuilding [Member] | North East [Member]
Segment Reporting Other Significant Reconciling Item [Line Items]
Consolidated expenditures for property and equipment	2,220	2,311	1,454
Operating Segments [Member] | Homebuilding [Member] | Mid East [Member]
Segment Reporting Other Significant Reconciling Item [Line Items]
Consolidated expenditures for property and equipment	3,774	6,982	3,282
Operating Segments [Member] | Homebuilding [Member] | South East [Member]
Segment Reporting Other Significant Reconciling Item [Line Items]
Consolidated expenditures for property and equipment	1,753	3,472	2,662
Operating Segments [Member] | Mortgage Banking [Member]
Segment Reporting Other Significant Reconciling Item [Line Items]
Consolidated expenditures for property and equipment	265	2,580	2,933
Consolidation adjustments and other [Member]
Segment Reporting Other Significant Reconciling Item [Line Items]
Consolidated expenditures for property and equipment	$ 1,978	$ 7,280	$ 738