Segment Information, Nature of Operations, and Certain Concentrations - Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 6,601,757	$ 5,660,973
Contract land deposit reserve	(53,397)	(57,060)
Home Building
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	6,142,087	5,247,170
Cash and cash equivalents	3,126,472	2,503,424
Deferred taxes	148,005	143,585
Operating Lease, Right-of-Use Asset	70,384	71,081
Finance Lease, Right-of-Use Asset, after Accumulated Amortization	13,310	13,745
Mortgage Banking
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	459,670	413,803
Cash and cash equivalents	36,422	19,415
Operating Lease, Right-of-Use Asset	23,541	16,011
Profit before taxes:
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	3,184,246	2,885,777
Profit before taxes: | Home Building | Mid Atlantic
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	1,252,360	1,152,564
Profit before taxes: | Home Building | North East
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	314,904	250,001
Profit before taxes: | Home Building | Mid East
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	368,154	378,833
Profit before taxes: | Home Building | South East
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	796,505	697,923
Profit before taxes: | Mortgage Banking
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	452,323	406,456
Reconciling items:
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	3,417,511	2,775,196
Cash and cash equivalents	3,126,472	2,503,424
Deferred taxes	148,005	143,585
Intangible assets and goodwill	49,368	49,368
Operating Lease, Right-of-Use Asset	70,384	71,081
Finance Lease, Right-of-Use Asset, after Accumulated Amortization	13,310	13,745
Contract land deposit reserve	(53,397)	(57,060)
Consolidation adjustments and other	$ 63,369	$ 51,053