Segment Disclosures - Revenues (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 1,800,194	$ 1,787,305	$ 3,487,205	$ 3,316,719
Home Building [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	1,757,448	1,750,463	3,400,654	3,240,556
Home Building [Member] | Mid Atlantic [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	982,032	973,677	1,863,356	1,816,173
Home Building [Member] | North East [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	121,804	147,618	244,431	270,332
Home Building [Member] | Mid East [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	359,908	363,288	698,457	653,525
Home Building [Member] | South East [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	293,704	265,880	594,410	500,526
Mortgage Banking [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 42,746	$ 36,842	$ 86,551	$ 76,163