Segment Disclosures - Income before Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	$ 565,945	$ 312,006
Equity-based compensation expense	(11,668)	(14,471)
Corporate interest expense	(13,166)	(13,397)
Home Building Segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	516,887	253,419
Corporate interest expense	(12,804)	(13,006)
Mortgage Banking
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	49,058	58,587
Corporate interest expense	(362)	(391)
Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	510,452	309,462
Operating Segments | Home Building Segment | Mid Atlantic
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	249,781	129,067
Operating Segments | Home Building Segment | North East
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	25,928	15,227
Operating Segments | Home Building Segment | Mid East
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	71,183	48,941
Operating Segments | Home Building Segment | South East
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	113,454	56,665
Operating Segments | Mortgage Banking
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	50,106	59,562
Corporate and Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	55,493	2,544
Contract land deposit reserve adjustment	5,926	6,196
Equity-based compensation expense	(11,668)	(14,471)
Corporate capital allocation	69,744	61,551
Unallocated corporate overhead	(45,261)	(39,717)
Consolidation adjustments and other (4)	49,507	1,967
Corporate interest expense	(12,755)	(12,982)
Corporate and Reconciling Items | Home Building Segment | Mid Atlantic
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Corporate capital allocation	34,087	30,596
Corporate and Reconciling Items | Home Building Segment | North East
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Corporate capital allocation	7,087	6,038
Corporate and Reconciling Items | Home Building Segment | Mid East
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Corporate capital allocation	11,417	10,624
Corporate and Reconciling Items | Home Building Segment | South East
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Corporate capital allocation	$ 17,153	$ 14,293