Segment Disclosures - Corporate Capital Allocation Charge (Detail) - Corporate and Reconciling Items - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Segment Reporting, Other Significant Reconciling Item [Line Items]
Corporate capital allocation charge	$ 96,562	$ 86,489	$ 276,087	$ 246,044
Home Building Segment | Mid Atlantic
Segment Reporting, Other Significant Reconciling Item [Line Items]
Corporate capital allocation charge	38,204	35,976	112,350	104,872
Home Building Segment | North East
Segment Reporting, Other Significant Reconciling Item [Line Items]
Corporate capital allocation charge	12,383	10,578	34,275	30,456
Home Building Segment | Mid East
Segment Reporting, Other Significant Reconciling Item [Line Items]
Corporate capital allocation charge	12,917	11,929	36,157	32,850
Home Building Segment | South East
Segment Reporting, Other Significant Reconciling Item [Line Items]
Corporate capital allocation charge	$ 33,058	$ 28,006	$ 93,305	$ 77,866