Segment Disclosures - Corporate Capital Allocation Charge (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Segment Reporting, Other Significant Reconciling Item [Line Items]
Corporate Capital Allocation	$ 34,511	$ 29,673	$ 63,477	$ 55,291
Operating Segments [Member] | Homebuilding Mid Atlantic [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Corporate Capital Allocation	21,742	18,609	39,898	34,716
Operating Segments [Member] | Homebuilding North East [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Corporate Capital Allocation	2,733	2,353	5,182	4,347
Operating Segments [Member] | Homebuilding Mid East [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Corporate Capital Allocation	6,180	5,716	11,478	10,731
Operating Segments [Member] | Homebuilding South East [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Corporate Capital Allocation	$ 3,856	$ 2,995	$ 6,919	$ 5,497