Segment Disclosures - Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 6,075,905	$ 5,660,973
Finance Lease, Right-of-Use Asset	13,492	13,745
Contract land deposit reserve	(53,469)	(57,060)
Home Building Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	5,631,752	5,247,170
Cash and cash equivalents	2,786,503	2,503,424
Operating lease right-of-use assets	71,593	71,081
Mortgage Banking
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	444,153	413,803
Cash and cash equivalents	14,259	19,415
Operating lease right-of-use assets	21,714	16,011
Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	2,987,880	2,885,777
Operating Segments | Home Building Segment | Mid Atlantic
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	1,219,228	1,152,564
Operating Segments | Home Building Segment | North East
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	277,044	250,001
Operating Segments | Home Building Segment | Mid East
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	364,849	378,833
Operating Segments | Home Building Segment | South East
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	689,953	697,923
Operating Segments | Mortgage Banking
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	436,806	406,456
Corporate and Reconciling Items
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	3,088,025	2,775,196
Cash and cash equivalents	2,786,503	2,503,424
Deferred taxes	147,363	143,585
Intangible assets and goodwill	49,368	49,368
Operating lease right-of-use assets	71,593	71,081
Finance Lease, Right-of-Use Asset	13,492	13,745
Contract land deposit reserve	(53,469)	(57,060)
Consolidation adjustments and other	$ 73,175	$ 51,053