Segment Disclosures - Revenues (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Segment Reporting Revenue Reconciling Item [Line Items]
Total consolidated revenues	$ 1,243,633	$ 1,102,054	$ 2,201,382	$ 1,913,364
Homebuilding Mid Atlantic [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues	746,168	657,825	1,302,288	1,122,855
Homebuilding North East [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues	114,375	92,438	197,368	171,230
Homebuilding Mid East [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues	221,083	221,088	406,512	371,736
Homebuilding South East [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues	139,485	112,729	256,481	217,446
Mortgage Banking [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Mortgage Banking	$ 22,522	$ 17,974	$ 38,733	$ 30,097