Segment Disclosures - Income before Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	$ 471,176	$ 574,012	$ 904,986	$ 1,139,957
Equity-based compensation expense			(47,436)	(31,755)
Corporate interest expense	(6,795)	(12,257)	(14,053)	(25,423)
Home Building Segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	434,711	544,947	840,461	1,061,834
Corporate interest expense	(6,628)	(11,852)	(13,629)	(24,656)
Mortgage Banking
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	36,465	29,065	64,525	78,123
Corporate interest expense	(167)	(405)	(424)	(767)
Interest income	3,823	2,772	6,841	4,846
Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	446,433	555,170	848,836	1,065,622
Operating Segments | Home Building Segment | Mid Atlantic
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	195,254	251,739	354,292	501,520
Operating Segments | Home Building Segment | North East
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	44,932	41,297	76,992	67,225
Operating Segments | Home Building Segment | Mid East
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	61,756	82,512	118,224	153,695
Operating Segments | Home Building Segment | South East
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	106,648	150,822	232,058	264,276
Operating Segments | Mortgage Banking
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	37,843	28,800	67,270	78,906
Corporate and Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	24,743	18,842	56,150	74,335
Contract land deposit reserve adjustment	6,888	419	10,479	6,345
Equity-based compensation expense	(25,159)	(20,087)	(47,436)	(31,755)
Corporate capital allocation	72,617	77,512	141,691	147,256
Unallocated corporate overhead	(46,360)	(32,282)	(92,325)	(77,543)
Consolidation adjustments and other (4)	(9,998)	2,004	(5,999)	50,764
Corporate interest expense	(6,589)	(11,816)	(13,543)	(24,571)
Interest income	33,344	3,092	63,283	3,839
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	35,337	37,121	68,516	71,208
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	8,272	8,158	15,597	15,245
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	9,819	12,875	19,479	24,292
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	$ 19,189	$ 19,358	$ 38,099	$ 36,511