Segment Disclosures - Corporate Capital Allocation Charge (Detail) - Corporate and Reconciling Items - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting, Other Significant Reconciling Item [Line Items]
Corporate capital allocation charge	$ 81,020	$ 64,055	$ 228,276	$ 188,638
Home Building Segment | Mid Atlantic
Segment Reporting, Other Significant Reconciling Item [Line Items]
Corporate capital allocation charge	37,305	31,057	108,514	92,788
Home Building Segment | North East
Segment Reporting, Other Significant Reconciling Item [Line Items]
Corporate capital allocation charge	7,994	6,719	23,238	19,214
Home Building Segment | Mid East
Segment Reporting, Other Significant Reconciling Item [Line Items]
Corporate capital allocation charge	14,509	11,114	38,801	32,804
Home Building Segment | South East
Segment Reporting, Other Significant Reconciling Item [Line Items]
Corporate capital allocation charge	$ 21,212	$ 15,165	$ 57,723	$ 43,832