Segment Disclosures - Income before Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	$ 533,568	$ 471,176	$ 1,004,260	$ 904,986
Equity-based compensation expense			(35,242)	(47,436)
Home Building Segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	488,536	434,711	930,214	840,461
Mortgage Banking
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	45,032	36,465	74,046	64,525
Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	467,802	446,433	892,085	848,836
Operating Segments | Home Building Segment | Mid Atlantic
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	209,166	195,254	399,130	354,292
Operating Segments | Home Building Segment | North East
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	54,372	44,932	101,229	76,992
Operating Segments | Home Building Segment | Mid East
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	63,588	61,756	129,989	118,224
Operating Segments | Home Building Segment | South East
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	94,442	106,648	185,847	232,058
Operating Segments | Mortgage Banking
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	46,234	37,843	75,890	67,270
Corporate and Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	65,766	24,743	112,175	56,150
Segment Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Contract land deposit reserve adjustment	1,325	6,888	8,791	10,479
Equity-based compensation expense	(18,101)	(25,159)	(35,242)	(47,436)
Corporate capital allocation	82,494	72,617	159,555	141,691
Unallocated corporate overhead	(33,816)	(46,360)	(85,520)	(92,325)
Consolidation adjustments and other	6,363	(9,998)	4,092	(5,999)
Corporate, Non-Segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Corporate Interest Expense	(6,670)	(6,589)	(13,265)	(13,543)
Interest income	$ 34,171	$ 33,344	$ 73,764	$ 63,283