Segment Disclosures - Income before Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Segment Reporting [Line Items]
Income before taxes	$ 318,641	$ 447,133	$ 570,335	$ 849,137
Equity-based compensation expense	(19,293)	(17,813)	(32,580)	(36,339)
Home Building Segment
Segment Reporting [Line Items]
Income before taxes	293,230	417,517	517,794	787,001
Mortgage Banking
Segment Reporting [Line Items]
Income before taxes	25,411	29,616	52,541	62,136
Operating Segments
Segment Reporting [Line Items]
Income before taxes	277,932	393,426	492,932	768,415
Operating Segments \| Home Building Segment \| Mid Atlantic
Segment Reporting [Line Items]
Income before taxes	105,550	191,390	196,859	378,223
Operating Segments \| Home Building Segment \| North East
Segment Reporting [Line Items]
Income before taxes	38,933	57,964	71,382	113,075
Operating Segments \| Home Building Segment \| Mid East
Segment Reporting [Line Items]
Income before taxes	58,881	61,729	93,547	115,338
Operating Segments \| Home Building Segment \| South East
Segment Reporting [Line Items]
Income before taxes	48,099	51,518	76,744	97,248
Operating Segments \| Mortgage Banking
Segment Reporting [Line Items]
Income before taxes	26,469	30,825	54,400	64,531
Corporate and Reconciling Items
Segment Reporting [Line Items]
Income before taxes	40,709	53,707	77,403	80,722
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment
Segment Reporting [Line Items]
Contract land deposit reserve adjustment	(21,664)	(13,153)	(30,481)	(21,270)
Equity-based compensation expense	(19,293)	(17,813)	(32,580)	(36,339)
Corporate capital allocation	(96,796)	(91,898)	(183,256)	(179,525)
Unallocated corporate overhead	(36,673)	(34,364)	(92,673)	(90,333)
Consolidation adjustments and other	17,016	13,538	34,834	17,470
Segment Reporting, Reconciling Item, Corporate Nonsegment
Segment Reporting [Line Items]
Corporate Interest Expense	(6,688)	(6,675)	(13,527)	(13,806)
Interest income	$ 11,215	$ 20,276	$ 28,574	$ 45,475

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