Segment Disclosures - Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 6,266,775	$ 5,660,973
Finance Lease, Right-of-Use Asset	13,231	13,745
Contract land deposit reserve	(46,401)	(57,060)
Home Building Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	5,705,502	5,247,170
Cash and cash equivalents	2,678,709	2,503,424
Operating lease right-of-use assets	73,469	71,081
Mortgage Banking
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	561,273	413,803
Cash and cash equivalents	13,873	19,415
Operating lease right-of-use assets	22,814	16,011
Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	3,289,336	2,885,777
Operating Segments | Home Building Segment | Mid Atlantic
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	1,271,377	1,152,564
Operating Segments | Home Building Segment | North East
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	317,956	250,001
Operating Segments | Home Building Segment | Mid East
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	393,767	378,833
Operating Segments | Home Building Segment | South East
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	752,310	697,923
Operating Segments | Mortgage Banking
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	553,926	406,456
Corporate and Reconciling Items
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	2,977,439	2,775,196
Cash and cash equivalents	2,678,709	2,503,424
Deferred taxes	146,663	143,585
Intangible assets and goodwill	49,368	49,368
Operating lease right-of-use assets	73,469	71,081
Finance Lease, Right-of-Use Asset	13,231	13,745
Contract land deposit reserve	(46,401)	(57,060)
Consolidation adjustments and other	$ 62,400	$ 51,053