Segment Information, Nature of Operations, and Certain Concentrations - Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 5,834,475	$ 5,777,141
Contract land deposit reserve	(30,041)	(52,205)
Home Building
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	5,455,443	5,214,516
Cash and cash equivalents	2,545,069	2,714,720
Deferred taxes	132,894	132,980
Operating Lease, Right-of-Use Asset	59,010	53,110
Finance Lease, Right-of-Use Asset, after Accumulated Amortization	14,578	15,772
Mortgage Banking
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	379,032	562,625
Cash and cash equivalents	28,398	63,547
Operating Lease, Right-of-Use Asset	9,758	12,439
Profit before taxes:
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	2,997,449	2,770,522
Profit before taxes: | Home Building | Mid Atlantic
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	1,322,818	1,140,910
Profit before taxes: | Home Building | North East
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	235,048	202,591
Profit before taxes: | Home Building | Mid East
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	438,700	377,448
Profit before taxes: | Home Building | South East
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	629,198	494,295
Profit before taxes: | Mortgage Banking
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	371,685	555,278
Reconciling items:
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	2,837,026	3,006,619
Cash and cash equivalents	2,545,069	2,714,720
Deferred taxes	132,894	132,980
Intangible assets and goodwill	49,368	49,678
Operating Lease, Right-of-Use Asset	59,010	53,110
Finance Lease, Right-of-Use Asset, after Accumulated Amortization	14,578	15,772
Contract land deposit reserve	(30,041)	(52,205)
Consolidation adjustments and other	$ 66,148	$ 92,564