Segment Disclosures - Revenues (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 1,620,368	$ 1,800,194	$ 3,202,896	$ 3,487,205
Home Building [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	1,588,758	1,757,448	3,144,465	3,400,654
Home Building [Member] | Mid Atlantic [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	839,845	982,032	1,613,903	1,863,356
Home Building [Member] | North East [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	98,219	121,804	204,355	244,431
Home Building [Member] | Mid East [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	299,955	359,908	620,650	698,457
Home Building [Member] | South East [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	350,739	293,704	705,557	594,410
Mortgage Banking [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 31,610	$ 42,746	$ 58,431	$ 86,551