Segment Disclosures - Income before Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	$ 444,073	$ 538,612	$ 1,293,210	$ 1,542,872
Equity-based compensation expense			(53,695)	(54,465)
Home Building Segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	411,354	503,667	1,198,355	1,433,881
Mortgage Banking
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	32,719	34,945	94,855	108,991
Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	386,614	483,008	1,155,029	1,375,094
Operating Segments | Home Building Segment | Mid Atlantic
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	168,141	214,132	546,364	613,262
Operating Segments | Home Building Segment | North East
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	51,964	56,246	165,039	157,476
Operating Segments | Home Building Segment | Mid East
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	76,431	81,385	191,769	211,374
Operating Segments | Home Building Segment | South East
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	56,872	95,089	154,120	280,936
Operating Segments | Mortgage Banking
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	33,206	36,156	97,737	112,046
Corporate and Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	57,459	55,604	138,181	167,778
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Contract land deposit reserve adjustment	(18,634)	(3,079)	(39,904)	5,712
Equity-based compensation expense	(17,356)	(19,223)	(53,695)	(54,465)
Corporate capital allocation	(96,562)	(86,489)	(276,087)	(246,044)
Unallocated corporate overhead	(26,359)	(36,780)	(116,692)	(122,300)
Consolidation adjustments and other	10,433	2,575	27,903	6,666
Segment Reporting, Reconciling Item, Corporate Nonsegment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Corporate Interest Expense	(6,841)	(6,787)	(20,647)	(20,052)
Interest income	$ 19,654	$ 32,409	$ 65,129	$ 106,173