Supplemental Guarantor Information (Statement Of Operations and Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Homebuilding
Home sale revenues									$ 8,323,984	$ 7,451,315	$ 5,792,675
Land sale revenues									57,106	36,035	48,536
Total homebuilding revenues	$ 2,737,391	$ 2,083,067	$ 1,973,571	$ 1,587,061	$ 2,438,903	$ 1,894,885	$ 1,756,832	$ 1,396,730	8,381,090	7,487,350	5,841,211
Financial Services	56,166	46,952	47,275	41,767	54,175	48,020	43,082	35,848	192,160	181,126	140,753
Total revenues	2,793,557	2,130,019	2,020,846	1,628,828	2,493,078	1,942,905	1,799,914	1,432,578	8,573,250	7,668,476	5,981,964
Homebuilding Cost of Revenues:
Home sale cost of revenues									(6,461,152)	(5,587,974)	(4,235,945)
Land sale cost of revenues									(134,449)	(32,115)	(35,858)
Total cost of revenues	(2,147,431)	(1,589,728)	(1,637,536)	(1,220,906)	(1,835,928)	(1,429,133)	(1,314,972)	(1,040,056)	(6,595,601)	(5,620,089)	(4,271,803)
Financial Services expenses									(119,289)	(108,573)	(82,047)
Selling, general, and administrative expenses									(891,581)	(957,150)	(794,728)
Other expense, net									(27,951)	(48,814)	(17,363)
Intercompany interest									0	0	0
Income (loss) before income taxes and equity in income (loss) of subsidiaries									938,828	933,850	816,023
Income tax expense	(331,352)	(90,710)	(21,798)	(47,747)	(140,549)	(83,865)	(71,820)	(34,913)	(491,607)	(331,147)	(321,933)
Income (loss) before equity in income (loss) of subsidiaries									447,221	602,703	494,090
Equity in income (loss) of subsidiaries									0	0	0
Net income	$ 77,415	$ 177,539	$ 100,749	$ 91,518	$ 273,172	$ 128,470	$ 117,760	$ 83,300	447,221	602,703	494,090
Other comprehensive income (loss)									81	83	81
Comprehensive income									447,302	602,786	494,171
Parent Company [Member]
Homebuilding
Home sale revenues									0	0	0
Land sale revenues									0	0	0
Total homebuilding revenues									0	0	0
Financial Services									0	0	0
Total revenues									0	0	0
Homebuilding Cost of Revenues:
Home sale cost of revenues									0	0	0
Land sale cost of revenues									0	0	0
Total cost of revenues									0	0	0
Financial Services expenses									0	0	(313)
Selling, general, and administrative expenses									0	0	(3)
Other expense, net									(482)	(1,321)	(760)
Intercompany interest									(2,485)	(1,980)	(2,110)
Income (loss) before income taxes and equity in income (loss) of subsidiaries									(2,967)	(3,301)	(3,186)
Income tax expense									1,127	1,254	1,210
Income (loss) before equity in income (loss) of subsidiaries									(1,840)	(2,047)	(1,976)
Equity in income (loss) of subsidiaries									449,061	604,750	496,066
Net income									447,221	602,703	494,090
Other comprehensive income (loss)									81	83	81
Comprehensive income									447,302	602,786	494,171
Guarantor Subsidiaries [Member]
Homebuilding
Home sale revenues									8,229,392	7,427,757	5,792,675
Land sale revenues									53,280	33,598	48,536
Total homebuilding revenues									8,282,672	7,461,355	5,841,211
Financial Services									0	0	1
Total revenues									8,282,672	7,461,355	5,841,212
Homebuilding Cost of Revenues:
Home sale cost of revenues									(6,385,167)	(5,566,653)	(4,235,945)
Land sale cost of revenues									(131,363)	(30,156)	(35,858)
Total cost of revenues									(6,516,530)	(5,596,809)	(4,271,803)
Financial Services expenses									(527)	(533)	276
Selling, general, and administrative expenses									(785,266)	(907,748)	(790,818)
Other expense, net									(58,619)	(69,345)	(17,424)
Intercompany interest									0	0	(7,922)
Income (loss) before income taxes and equity in income (loss) of subsidiaries									921,730	886,920	753,521
Income tax expense									(483,435)	(312,486)	(297,485)
Income (loss) before equity in income (loss) of subsidiaries									438,295	574,434	456,036
Equity in income (loss) of subsidiaries									58,559	58,078	40,484
Net income									496,854	632,512	496,520
Other comprehensive income (loss)									0	0	0
Comprehensive income									496,854	632,512	496,520
Non-Guarantor Subsidiaries [Member]
Homebuilding
Home sale revenues									94,592	23,558	0
Land sale revenues									3,826	2,437	0
Total homebuilding revenues									98,418	25,995	0
Financial Services									192,160	181,126	140,752
Total revenues									290,578	207,121	140,752
Homebuilding Cost of Revenues:
Home sale cost of revenues									(75,985)	(21,321)	0
Land sale cost of revenues									(3,086)	(1,959)	0
Total cost of revenues									(79,071)	(23,280)	0
Financial Services expenses									(118,762)	(108,040)	(82,010)
Selling, general, and administrative expenses									(106,315)	(49,402)	(3,907)
Other expense, net									31,150	21,852	821
Intercompany interest									2,485	1,980	10,032
Income (loss) before income taxes and equity in income (loss) of subsidiaries									20,065	50,231	65,688
Income tax expense									(9,299)	(19,915)	(25,658)
Income (loss) before equity in income (loss) of subsidiaries									10,766	30,316	40,030
Equity in income (loss) of subsidiaries									226,864	457,716	411,699
Net income									237,630	488,032	451,729
Other comprehensive income (loss)									0	0	0
Comprehensive income									237,630	488,032	451,729
Eliminating Entries [Member]
Homebuilding
Home sale revenues									0	0	0
Land sale revenues									0	0	0
Total homebuilding revenues									0	0	0
Financial Services									0	0	0
Total revenues									0	0	0
Homebuilding Cost of Revenues:
Home sale cost of revenues									0	0	0
Land sale cost of revenues									0	0	0
Total cost of revenues									0	0	0
Financial Services expenses									0	0	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									(734,484)	(1,120,544)	(948,249)
Net income									(734,484)	(1,120,544)	(948,249)
Other comprehensive income (loss)									0	0	0
Comprehensive income									$ (734,484)	$ (1,120,544)	$ (948,249)