Segment Information (Operating Data By Segment) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information
Impairment Losses Related to Real Estate Partnerships									$ 0	$ 0	$ 8,018
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax									10,212,957	10,188,331	8,577,686
Consolidated revenues	$ 3,016,913	$ 2,710,365	$ 2,488,985	$ 1,996,693	$ 2,999,150	$ 2,649,366	$ 2,569,722	$ 1,970,093
Income (loss) before income taxes:
Consolidated income (loss) before income taxes	435,951	366,146	320,776	216,703	329,491	384,688	409,170	224,191	1,339,576	1,347,540	938,828
Homebuilding	402,407	333,862	295,698	204,294	324,938	365,055	388,453	210,358	1,236,261	1,288,804	865,332
Total land-related charges									27,101	99,446	191,913
Write-off of insurance receivables			12,600	11,600
Loss on debt retirements									4,927	76	0
Adjustment to self insurance reserves	31,100		12,800				37,900		(49,437)	(35,873)	(97,789)
Reserves provided					16,200				(225)	16,130	(50)
Northeast [Member]
Income (loss) before income taxes:
Consolidated income (loss) before income taxes									116,221	29,629	21,190
Total land-related charges									1,122	74,488	51,362
Southeast [Member]
Income (loss) before income taxes:
Consolidated income (loss) before income taxes									175,763	202,639	122,532
Total land-related charges									15,697	8,140	55,689
Product Warranty Expense									14,800
Florida [Member]
Income (loss) before income taxes:
Consolidated income (loss) before income taxes									309,596	289,418	208,825
Total land-related charges									2,811	1,166	9,702
Product Warranty Expense											12,400
Texas [Member]
Income (loss) before income taxes:
Consolidated income (loss) before income taxes									195,751	193,946	182,862
Total land-related charges									1,151	1,204	2,521
Midwest [Member]
Income (loss) before income taxes:
Consolidated income (loss) before income taxes									184,438	179,568	178,231
Total land-related charges									2,581	7,361	8,917
West [Member]
Income (loss) before income taxes:
Consolidated income (loss) before income taxes									386,361	511,828	229,504
Total land-related charges									2,568	5,159	56,996
Other Homebuilding [Member]
Income (loss) before income taxes:
Consolidated income (loss) before income taxes									(131,869)	(118,224)	(77,812)
Total land-related charges									1,171	1,928	6,726
Write-off of insurance receivables									22,600		29,600
Financial Services [Member]
Income (loss) before income taxes:
Consolidated income (loss) before income taxes									103,315	58,736	73,496
Financial Service [Member]
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax	69,797	64,815	55,957	43,862	55,059	51,620	52,764	45,938	234,431	205,382	192,160
Total Homebuilding [Member]
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax	$ 2,947,116	$ 2,645,550	$ 2,433,028	$ 1,952,831	$ 2,944,091	$ 2,597,746	$ 2,516,958	$ 1,924,155	9,978,526	9,982,949	8,385,526
Total Homebuilding [Member] | Northeast [Member]
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax									797,963	839,700	693,877
Total Homebuilding [Member] | Southeast [Member]
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax									1,684,655	1,746,161	1,564,116
Total Homebuilding [Member] | Florida [Member]
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax									2,074,194	1,944,170	1,494,389
Total Homebuilding [Member] | Texas [Member]
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax									1,389,211	1,301,004	1,168,755
Total Homebuilding [Member] | Midwest [Member]
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax									1,495,037	1,497,389	1,450,192
Total Homebuilding [Member] | West [Member]
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax									$ 2,537,466	2,654,525	$ 2,014,197
California | Land Sales [Member] | West [Member]
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax										$ (26,400)