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Segment Disclosures - Income before Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	$ 539,340	$ 538,515	$ 1,444,326	$ 1,678,472
Home Building Segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	500,806	520,929	1,341,267	1,582,763
Mortgage Banking
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	38,534	17,586	103,059	95,709
Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	484,336	579,450	1,333,172	1,645,072
Operating Segments | Home Building Segment | Mid Atlantic
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	212,826	272,860	567,119	774,380
Operating Segments | Home Building Segment | North East
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	48,787	49,614	125,779	116,839
Operating Segments | Home Building Segment | Mid East
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	75,136	92,364	193,360	246,059
Operating Segments | Home Building Segment | South East
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	107,666	145,619	339,723	409,895
Operating Segments | Mortgage Banking
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	39,921	18,993	107,191	97,899
Corporate and Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	55,004	(40,935)	111,154	33,400
Corporate and Reconciling Items | Corporate Capital Allocation
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	74,171	81,020	215,862	228,276
Corporate and Reconciling Items | Consolidation Adjustments and Other
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	16,947	(66,182)	10,948	(15,417)
Corporate and Reconciling Items | Corporate Interest Expense
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	6,583	6,803	20,126	31,374
Corporate and Reconciling Items | Corporate Interest Income
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	38,680	9,017	101,963	12,856
Segment Reconciling Items | Contract Land Deposit Reserve Adjustment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	(3,783)	(8,736)	6,696	(2,391)
Segment Reconciling Items | Equity-based Compensation Expense
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	26,052	26,686	73,488	58,441
Segment Reconciling Items | Unallocated Corporate Overhead
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before taxes	$ (38,376)	$ (22,565)	$ (130,701)	$ (100,109)

X

- Definition

The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(h)(1))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 6.I.Fact.3)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479360/740-10-S99-1

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