Segment Disclosures - Income before Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	$ 538,515	$ 434,127	$ 1,678,472	$ 1,163,598
Equity-based compensation expense	(26,686)	(15,009)	(58,441)	(42,859)
Corporate interest expense	(7,202)	(13,243)	(32,625)	(39,910)
Home Building Segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	520,929	395,108	1,582,763	1,026,790
Corporate interest expense	(6,854)	(12,838)	(31,510)	(38,694)
Mortgage Banking
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	17,586	39,019	95,709	136,808
Corporate interest expense	(348)	(405)	(1,115)	(1,216)
Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	579,450	478,347	1,645,072	1,162,978
Operating Segments | Home Building Segment | Mid Atlantic
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	272,860	222,504	774,380	526,052
Operating Segments | Home Building Segment | North East
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	49,614	33,885	116,839	70,622
Operating Segments | Home Building Segment | Mid East
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	92,364	81,021	246,059	189,849
Operating Segments | Home Building Segment | South East
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	145,619	100,688	409,895	236,272
Operating Segments | Mortgage Banking
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	18,993	40,249	97,899	140,183
Corporate and Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	(40,935)	(44,220)	33,400	620
Contract land deposit reserve adjustment	(8,736)	4,126	(2,391)	17,500
Equity-based compensation expense	(26,686)	(15,009)	(58,441)	(42,859)
Corporate capital allocation	81,020	64,055	228,276	188,638
Unallocated corporate overhead	(22,565)	(27,801)	(100,109)	(101,605)
Consolidation adjustments and other (4)	(57,165)	(56,786)	(2,561)	(22,456)
Corporate interest expense	(6,803)	(12,805)	(31,374)	(38,598)
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	37,305	31,057	108,514	92,788
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	7,994	6,719	23,238	19,214
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	14,509	11,114	38,801	32,804
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	$ 21,212	$ 15,165	$ 57,723	$ 43,832