Segment Disclosures - Revenues (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 2,395,640	$ 1,990,012	$ 6,720,684	$ 5,192,908
Home Building Segment
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	2,336,615	1,920,751	6,524,886	5,065,216
Home Building Segment | Mid Atlantic
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	1,082,710	949,472	3,067,267	2,563,375
Home Building Segment | North East
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	213,087	157,973	568,524	362,328
Home Building Segment | Mid East
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	503,232	404,992	1,406,364	1,025,642
Home Building Segment | South East
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	537,586	408,314	1,482,731	1,113,871
Mortgage Banking
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 59,025	$ 69,261	$ 195,798	$ 127,692