Segment Disclosures - Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 6,372,263	$ 5,660,973
Finance Lease, Right-of-Use Asset	12,836	13,745
Contract land deposit reserve	(50,183)	(57,060)
Home Building Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	5,899,855	5,247,170
Cash and cash equivalents	2,876,606	2,503,424
Operating lease right-of-use assets	72,358	71,081
Mortgage Banking
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	472,408	413,803
Cash and cash equivalents	32,310	19,415
Operating lease right-of-use assets	24,595	16,011
Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	3,205,707	2,885,777
Operating Segments | Home Building Segment | Mid Atlantic
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	1,268,489	1,152,564
Operating Segments | Home Building Segment | North East
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	315,502	250,001
Operating Segments | Home Building Segment | Mid East
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	377,300	378,833
Operating Segments | Home Building Segment | South East
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	779,355	697,923
Operating Segments | Mortgage Banking
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	465,061	406,456
Corporate and Reconciling Items
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	3,166,556	2,775,196
Cash and cash equivalents	2,876,606	2,503,424
Deferred taxes	148,204	143,585
Intangible assets and goodwill	49,368	49,368
Operating lease right-of-use assets	72,358	71,081
Finance Lease, Right-of-Use Asset	12,836	13,745
Contract land deposit reserve	(50,183)	(57,060)
Consolidation adjustments and other	$ 57,367	$ 51,053