Supplemental Guarantor Information (Statement Of Operations and Comprehensive Income (Loss)) (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
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax									$ 10,212,957	$ 10,188,331	$ 8,577,686
Selling, general, and administrative expenses									(1,044,337)	(1,012,023)	(891,581)
Other expense, net									(13,476)	(13,849)	(32,387)
Intercompany interest									0	0	0
Income (loss) before income taxes and equity in income (loss) of subsidiaries									1,339,576	1,347,540	938,828
Income tax expense	$ (100,153)	$ (93,042)	$ (79,735)	$ (49,946)	$ (91,842)	$ (95,153)	$ (85,081)	$ (53,440)	(322,876)	(325,517)	(491,607)
Income (loss) before equity in income (loss) of subsidiaries									1,016,700	1,022,023	447,221
Equity in income (loss) of subsidiaries									0	0	0
Net income	335,798	273,104	241,041	166,757	237,649	289,535	324,089	170,751	1,016,700	1,022,023	447,221
Other comprehensive income (loss)									100	100	81
Comprehensive income									1,016,800	1,022,123	447,302
Parent Company [Member]
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax									0	0	0
Cost of Goods and Services Sold											0
Selling, general, and administrative expenses									0	0	0
Other expense, net									(5,423)	(580)	(482)
Intercompany interest									(8,194)	(7,835)	(2,485)
Income (loss) before income taxes and equity in income (loss) of subsidiaries									(13,617)	(8,415)	(2,967)
Income tax expense									3,404	2,104	1,127
Income (loss) before equity in income (loss) of subsidiaries									(10,213)	(6,311)	(1,840)
Equity in income (loss) of subsidiaries									1,026,913	1,028,334	449,061
Net income									1,016,700	1,022,023	447,221
Other comprehensive income (loss)									100	100	81
Comprehensive income									1,016,800	1,022,123	447,302
Guarantor Subsidiaries [Member]
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax									9,786,703	9,856,715	8,287,103
Cost of Goods and Services Sold											6,385,167
Selling, general, and administrative expenses									(994,262)	(974,858)	(785,266)
Other expense, net									(46,490)	(53,765)	(63,050)
Intercompany interest									0	0	0
Income (loss) before income taxes and equity in income (loss) of subsidiaries									1,206,057	1,253,170	921,730
Income tax expense									(289,102)	(304,218)	(483,435)
Income (loss) before equity in income (loss) of subsidiaries									916,955	948,952	438,295
Equity in income (loss) of subsidiaries									120,622	73,097	58,559
Net income									1,037,577	1,022,049	496,854
Other comprehensive income (loss)									0	0	0
Comprehensive income									1,037,577	1,022,049	496,854
Non-Guarantor Subsidiaries [Member]
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax									426,254	331,616	290,583
Cost of Goods and Services Sold											75,985
Selling, general, and administrative expenses									(50,075)	(37,165)	(106,315)
Other expense, net									38,437	40,496	31,145
Intercompany interest									8,194	7,835	2,485
Income (loss) before income taxes and equity in income (loss) of subsidiaries									147,136	102,785	20,065
Income tax expense									(37,178)	(23,403)	(9,299)
Income (loss) before equity in income (loss) of subsidiaries									109,958	79,382	10,766
Equity in income (loss) of subsidiaries									962,865	782,948	226,864
Net income									1,072,823	862,330	237,630
Other comprehensive income (loss)									0	0	0
Comprehensive income									1,072,823	862,330	237,630
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
Homebuilding Cost of Revenues:
Cost of Revenue	2,279,615	2,035,972	1,874,369	1,494,841	2,319,473	1,976,220	1,900,316	1,471,488	7,684,798	7,667,497	6,595,601
Total Homebuilding [Member] | Parent Company [Member]
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax									0	0	0
Homebuilding Cost of Revenues:
Cost of Revenue									0	0	0
Total Homebuilding [Member] | Guarantor Subsidiaries [Member]
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax									9,786,703	9,856,715	8,287,103
Homebuilding Cost of Revenues:
Cost of Revenue									7,539,411	7,574,359	6,516,530
Total Homebuilding [Member] | Non-Guarantor Subsidiaries [Member]
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax									191,823	126,234	98,423
Homebuilding Cost of Revenues:
Cost of Revenue									145,387	93,138	79,071
Home Building [Member]
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax									9,915,705	9,818,445	8,323,984
Cost of Goods and Services Sold									7,628,700	7,540,937	6,461,152
Home Building [Member] | Parent Company [Member]
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax									0	0	0
Cost of Goods and Services Sold									0	0
Home Building [Member] | Guarantor Subsidiaries [Member]
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax									9,725,421	9,694,703	8,229,392
Cost of Goods and Services Sold									7,485,268	7,449,343
Home Building [Member] | Non-Guarantor Subsidiaries [Member]
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax									190,284	123,742	94,592
Cost of Goods and Services Sold									143,432	91,594
Land [Member]
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax									62,821	164,504	61,542
Cost of Goods and Services Sold									56,098	126,560	134,449
Land [Member] | Parent Company [Member]
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax									0	0	0
Cost of Goods and Services Sold									0	0	0
Land [Member] | Guarantor Subsidiaries [Member]
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax									61,282	162,012	57,711
Cost of Goods and Services Sold									54,143	125,016	131,363
Land [Member] | Non-Guarantor Subsidiaries [Member]
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax									1,539	2,492	3,831
Cost of Goods and Services Sold									1,955	1,544	3,086
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
Homebuilding Cost of Revenues:
Cost of Revenue									130,770	147,422	119,289
Financial Service [Member] | Parent Company [Member]
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax									0	0	0
Homebuilding Cost of Revenues:
Cost of Revenue									0	0	0
Financial Service [Member] | Guarantor Subsidiaries [Member]
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax									0	0	0
Homebuilding Cost of Revenues:
Cost of Revenue									483	563	527
Financial Service [Member] | Non-Guarantor Subsidiaries [Member]
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax									234,431	205,382	192,160
Homebuilding Cost of Revenues:
Cost of Revenue									130,287	146,859	118,762
Eliminating Entries [Member]
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax									0	0	0
Cost of Goods and Services Sold											0
Selling, general, and administrative expenses									0	0	0
Other expense, net									0	0	0
Intercompany interest									0	0	0
Income (loss) before income taxes and equity in income (loss) of subsidiaries									0	0	0
Income tax expense									0	0	0
Income (loss) before equity in income (loss) of subsidiaries									0	0	0
Equity in income (loss) of subsidiaries									(2,110,400)	(1,884,379)	(734,484)
Net income									(2,110,400)	(1,884,379)	(734,484)
Other comprehensive income (loss)									0	0	0
Comprehensive income									(2,110,400)	(1,884,379)	(734,484)
Eliminating Entries [Member] | Total Homebuilding [Member]
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax									0	0	0
Homebuilding Cost of Revenues:
Cost of Revenue									0	0	0
Eliminating Entries [Member] | Home Building [Member]
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax									0	0	0
Cost of Goods and Services Sold									0	0
Eliminating Entries [Member] | Land [Member]
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax									0	0	0
Cost of Goods and Services Sold									0	0	0
Eliminating Entries [Member] | Financial Service [Member]
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax									0	0	0
Homebuilding Cost of Revenues:
Cost of Revenue									$ 0	$ 0	$ 0