Segment Information, Nature of Operations, and Certain Concentrations - Depreciation and Amortization (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 depreciation and amortization	$ 21,534	$ 17,614	$ 13,391
Operating Segments [Member]
Segment Reporting Other Significant Reconciling Item [Line Items]
Consolidated depreciation and amortization	16,777	13,713	9,225
Operating Segments [Member] | Homebuilding [Member] | Mid Atlantic [Member]
Segment Reporting Other Significant Reconciling Item [Line Items]
Consolidated depreciation and amortization	7,876	6,489	4,784
Operating Segments [Member] | Homebuilding [Member] | North East [Member]
Segment Reporting Other Significant Reconciling Item [Line Items]
Consolidated depreciation and amortization	1,571	1,208	853
Operating Segments [Member] | Homebuilding [Member] | Mid East [Member]
Segment Reporting Other Significant Reconciling Item [Line Items]
Consolidated depreciation and amortization	4,003	3,212	1,911
Operating Segments [Member] | Homebuilding [Member] | South East [Member]
Segment Reporting Other Significant Reconciling Item [Line Items]
Consolidated depreciation and amortization	2,191	1,715	1,008
Operating Segments [Member] | Mortgage Banking [Member]
Segment Reporting Other Significant Reconciling Item [Line Items]
Consolidated depreciation and amortization	1,136	1,089	669
Consolidation adjustments and other [Member]
Segment Reporting Other Significant Reconciling Item [Line Items]
Consolidated depreciation and amortization	$ 4,757	$ 3,901	$ 4,166