Supplemental Guarantor Information (Statement Of Operations and Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax									$ 10,188,331	$ 8,577,686	$ 7,676,530
Selling, general, and administrative expenses									(1,012,023)	(891,581)	(957,150)
Other expense, net									(13,849)	(32,387)	(56,868)
Intercompany interest									0	0	0
Income (loss) before income taxes and equity in income (loss) of subsidiaries									1,347,540	938,828	933,850
Income tax expense	$ (91,842)	$ (95,153)	$ (85,081)	$ (53,440)	$ (331,352)	$ (90,710)	$ (21,798)	$ (47,747)	(325,517)	(491,607)	(331,147)
Income (loss) before equity in income (loss) of subsidiaries									1,022,023	447,221	602,703
Equity in income (loss) of subsidiaries									0	0	0
Net income	237,649	289,535	324,089	170,751	77,415	177,539	100,749	91,518	1,022,023	447,221	602,703
Other comprehensive income (loss)									100	81	83
Comprehensive income									1,022,123	447,302	602,786
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									(580)	(482)	(1,321)
Intercompany interest									(7,835)	(2,485)	(1,980)
Income (loss) before income taxes and equity in income (loss) of subsidiaries									(8,415)	(2,967)	(3,301)
Income tax expense									2,104	1,127	1,254
Income (loss) before equity in income (loss) of subsidiaries									(6,311)	(1,840)	(2,047)
Equity in income (loss) of subsidiaries									1,028,334	449,061	604,750
Net income									1,022,023	447,221	602,703
Other comprehensive income (loss)									100	81	83
Comprehensive income									1,022,123	447,302	602,786
Guarantor Subsidiaries [Member]
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax									9,856,715	8,287,103	7,469,399
Cost of Goods and Services Sold											5,566,653
Selling, general, and administrative expenses									(974,858)	(785,266)	(907,748)
Other expense, net									(53,765)	(63,050)	(77,389)
Intercompany interest									0	0	0
Income (loss) before income taxes and equity in income (loss) of subsidiaries									1,253,170	921,730	886,920
Income tax expense									(304,218)	(483,435)	(312,486)
Income (loss) before equity in income (loss) of subsidiaries									948,952	438,295	574,434
Equity in income (loss) of subsidiaries									73,097	58,559	58,078
Net income									1,022,049	496,854	632,512
Other comprehensive income (loss)									0	0	0
Comprehensive income									1,022,049	496,854	632,512
Non-Guarantor Subsidiaries [Member]
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax									331,616	290,583	207,131
Cost of Goods and Services Sold											21,321
Selling, general, and administrative expenses									(37,165)	(106,315)	(49,402)
Other expense, net									40,496	31,145	21,842
Intercompany interest									7,835	2,485	1,980
Income (loss) before income taxes and equity in income (loss) of subsidiaries									102,785	20,065	50,231
Income tax expense									(23,403)	(9,299)	(19,915)
Income (loss) before equity in income (loss) of subsidiaries									79,382	10,766	30,316
Equity in income (loss) of subsidiaries									782,948	226,864	457,716
Net income									862,330	237,630	488,032
Other comprehensive income (loss)									0	0	0
Comprehensive income									862,330	237,630	488,032
Total Homebuilding [Member]
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax	2,944,091	2,597,746	2,516,958	1,924,155	2,738,724	2,084,106	1,974,584	1,588,111	9,982,949	8,385,526	7,495,404
Homebuilding Cost of Revenues:
Cost of Revenue	2,319,473	1,976,220	1,900,316	1,471,488	2,147,431	1,589,728	1,637,536	1,220,906	7,667,497	6,595,601	5,620,089
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									9,856,715	8,287,103	7,469,399
Homebuilding Cost of Revenues:
Cost of Revenue									7,574,359	6,516,530	5,596,809
Total Homebuilding [Member] | Non-Guarantor Subsidiaries [Member]
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax									126,234	98,423	26,005
Homebuilding Cost of Revenues:
Cost of Revenue									93,138	79,071	23,280
Home Building [Member]
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax									9,818,445	8,323,984	7,451,315
Cost of Goods and Services Sold									7,540,937	6,461,152	5,587,974
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									9,694,703	8,229,392	7,427,757
Cost of Goods and Services Sold									7,449,343	6,385,167
Home Building [Member] | Non-Guarantor Subsidiaries [Member]
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax									123,742	94,592	23,558
Cost of Goods and Services Sold									91,594	75,985
Land [Member]
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax									164,504	61,542	44,089
Cost of Goods and Services Sold									126,560	134,449	32,115
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									162,012	57,711	41,642
Cost of Goods and Services Sold									125,016	131,363	30,156
Land [Member] | Non-Guarantor Subsidiaries [Member]
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax									2,492	3,831	2,447
Cost of Goods and Services Sold									1,544	3,086	1,959
Financial Service [Member]
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax	$ 55,059	$ 51,620	$ 52,764	$ 45,938	$ 56,166	$ 46,952	$ 47,275	$ 41,767	205,382	192,160	181,126
Homebuilding Cost of Revenues:
Cost of Revenue									147,422	119,289	108,573
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									563	527	533
Financial Service [Member] | Non-Guarantor Subsidiaries [Member]
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax									205,382	192,160	181,126
Homebuilding Cost of Revenues:
Cost of Revenue									146,859	118,762	108,040
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									(1,884,379)	(734,484)	(1,120,544)
Net income									(1,884,379)	(734,484)	(1,120,544)
Other comprehensive income (loss)									0	0	0
Comprehensive income									(1,884,379)	(734,484)	(1,120,544)
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