Segment Disclosures - Income before Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	$ 574,012	$ 417,465	$ 1,139,957	$ 729,471
Equity-based compensation expense	(20,087)	(13,379)	(31,755)	(27,850)
Corporate interest expense	(12,257)	(13,270)	(25,423)	(26,667)
Home Building Segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	544,947	378,263	1,061,834	631,682
Corporate interest expense	(11,852)	(12,850)	(24,656)	(25,856)
Mortgage Banking
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	29,065	39,202	78,123	97,789
Corporate interest expense	(405)	(420)	(767)	(811)
Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	555,170	375,169	1,065,622	684,631
Operating Segments | Home Building Segment | Mid Atlantic
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	251,739	174,481	501,520	303,548
Operating Segments | Home Building Segment | North East
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	41,297	21,510	67,225	36,737
Operating Segments | Home Building Segment | Mid East
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	82,512	59,887	153,695	108,828
Operating Segments | Home Building Segment | South East
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	150,822	78,919	264,276	135,584
Operating Segments | Mortgage Banking
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	28,800	40,372	78,906	99,934
Corporate and Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	18,842	42,296	74,335	44,840
Contract land deposit reserve adjustment	419	7,178	6,345	13,374
Equity-based compensation expense	(20,087)	(13,379)	(31,755)	(27,850)
Corporate capital allocation	77,512	63,032	147,256	124,583
Unallocated corporate overhead	(32,282)	(33,668)	(77,543)	(73,804)
Consolidation adjustments and other (4)	5,096	31,944	54,603	34,330
Corporate interest expense	(11,816)	(12,811)	(24,571)	(25,793)
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	37,121	31,135	71,208	61,731
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	8,158	6,457	15,245	12,495
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	12,875	11,066	24,292	21,690
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	$ 19,358	$ 14,374	$ 36,511	$ 28,667