Supplemental Guarantor Information - Condensed Consolidating Statement of Operations (Detail) - 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
Condensed Financial Statements Captions [Line Items]
Revenues	$ 1,141,274	$ 748,395	$ 698,714	$ 494,632	$ 1,132,697	$ 775,071	$ 771,303	$ 583,676	$ 3,083,015	$ 3,262,747	$ 2,810,272
Other operations expense									2,434	3,174	2,298
Sales and marketing									195,148	187,267	137,066
General and administrative									157,161	155,030	137,764
Homebuilding income from operations									253,859	353,204	343,634
Equity in loss of unconsolidated entities									(52)	(393)	(11,433)
Other income, net									6,857	(419)	151
Homebuilding income before income taxes									260,664	352,392	332,352
Equity in income of unconsolidated entities									9,316	8,517	6,426
Financial services income before taxes									10,423	9,673	7,466
Income before income taxes									271,087	362,065	339,818
Provision for income taxes									(63,900)	(90,552)	(152,267)
Equity of net income (loss) of subsidiaries									0	0	0
Net income	117,993	62,861	26,262	71	100,984	63,969	63,680	42,880	207,187	271,513	187,551
Net income attributable to noncontrolling interests	0	0	0	0	(1,602)	0	0	0	0	(1,602)	(360)
Net income available to common stockholders	$ 117,993	$ 62,861	$ 26,262	$ 71	$ 99,382	$ 63,969	$ 63,680	$ 42,880	207,187	269,911	187,191
Reporting Entity | Issuer
Condensed Financial Statements Captions [Line Items]
Other operations expense									0	0	0
Sales and marketing									42,432	48,593	34,286
General and administrative									80,798	78,669	67,006
Homebuilding income from operations									3,184	50,902	45,223
Equity in loss of unconsolidated entities									0	0	0
Other income, net									6,188	(623)	38
Homebuilding income before income taxes									9,372	50,279	45,261
Equity in income of unconsolidated entities									0	0	0
Financial services income before taxes									0	0	0
Income before income taxes									9,372	50,279	45,261
Provision for income taxes									(2,323)	(13,084)	(22,501)
Equity of net income (loss) of subsidiaries									200,138	232,716	164,431
Net income										269,911	187,191
Net income attributable to noncontrolling interests										0	0
Net income available to common stockholders									207,187	269,911	187,191
Reporting Entity | Guarantor Subsidiaries
Condensed Financial Statements Captions [Line Items]
Other operations expense									2,434	3,174	2,298
Sales and marketing									152,716	138,674	102,780
General and administrative									76,363	76,361	70,758
Homebuilding income from operations									250,675	302,302	298,411
Equity in loss of unconsolidated entities									(52)	(393)	(11,433)
Other income, net									669	204	113
Homebuilding income before income taxes									251,292	302,113	287,091
Equity in income of unconsolidated entities									9,316	8,517	6,426
Financial services income before taxes									10,423	9,673	7,466
Income before income taxes									261,715	311,786	294,557
Provision for income taxes									(61,577)	(77,468)	(129,766)
Equity of net income (loss) of subsidiaries									0	0	0
Net income										234,318	164,791
Net income attributable to noncontrolling interests										(1,602)	(360)
Net income available to common stockholders									200,138	232,716	164,431
Consolidating Adjustments
Condensed Financial Statements Captions [Line Items]
Other operations expense									0	0	0
Sales and marketing									0	0	0
General and administrative									0	0	0
Homebuilding income from operations									0	0	0
Equity in loss of unconsolidated entities									0	0	0
Other income, net									0	0	0
Homebuilding income before income taxes									0	0	0
Equity in income of unconsolidated entities									0	0	0
Financial services income before taxes									0	0	0
Income before income taxes									0	0	0
Provision for income taxes									0	0	0
Equity of net income (loss) of subsidiaries									(200,138)	(232,716)	(164,431)
Net income										(232,716)	(164,431)
Net income attributable to noncontrolling interests										0	0
Net income available to common stockholders									(200,138)	(232,716)	(164,431)
Homebuilding
Condensed Financial Statements Captions [Line Items]
Revenues									3,079,021	3,261,009	2,808,901
Homebuilding | Reporting Entity | Issuer
Condensed Financial Statements Captions [Line Items]
Revenues									796,959	1,073,592	927,247
Homebuilding | Reporting Entity | Guarantor Subsidiaries
Condensed Financial Statements Captions [Line Items]
Revenues									2,282,062	2,187,417	1,881,654
Homebuilding | Consolidating Adjustments
Condensed Financial Statements Captions [Line Items]
Revenues									0	0	0
Home sales
Condensed Financial Statements Captions [Line Items]
Home sales									3,069,375	3,244,087	2,732,299
Cost of home sales									2,462,708	2,536,899	2,173,251
Home sales | Reporting Entity | Issuer
Condensed Financial Statements Captions [Line Items]
Home sales									796,959	1,073,592	927,247
Cost of home sales									670,545	877,928	780,732
Home sales | Reporting Entity | Guarantor Subsidiaries
Condensed Financial Statements Captions [Line Items]
Home sales									2,272,416	2,170,495	1,805,052
Cost of home sales									1,792,163	1,658,971	1,392,519
Home sales | Consolidating Adjustments
Condensed Financial Statements Captions [Line Items]
Home sales									0	0	0
Cost of home sales									0	0	0
Land and lot sales
Condensed Financial Statements Captions [Line Items]
Home sales									7,176	8,758	74,269
Cost of home sales									7,711	25,435	14,888
Land and lot sales | Reporting Entity | Issuer
Condensed Financial Statements Captions [Line Items]
Home sales									0	0	0
Cost of home sales									0	17,500	0
Land and lot sales | Reporting Entity | Guarantor Subsidiaries
Condensed Financial Statements Captions [Line Items]
Home sales									7,176	8,758	74,269
Cost of home sales									7,711	7,935	14,888
Land and lot sales | Consolidating Adjustments
Condensed Financial Statements Captions [Line Items]
Home sales									0	0	0
Cost of home sales									0	0	0
Other operations
Condensed Financial Statements Captions [Line Items]
Revenues									2,470	8,164	2,333
Other operations | Reporting Entity | Issuer
Condensed Financial Statements Captions [Line Items]
Revenues									0	0	0
Other operations | Reporting Entity | Guarantor Subsidiaries
Condensed Financial Statements Captions [Line Items]
Revenues									2,470	8,164	2,333
Other operations | Consolidating Adjustments
Condensed Financial Statements Captions [Line Items]
Revenues									0	0	0
Financial services
Condensed Financial Statements Captions [Line Items]
Revenues									3,994	1,738	1,371
Cost of home sales									2,887	582	331
Financial services | Reporting Entity | Issuer
Condensed Financial Statements Captions [Line Items]
Revenues									0	0	0
Cost of home sales									0	0	0
Financial services | Reporting Entity | Guarantor Subsidiaries
Condensed Financial Statements Captions [Line Items]
Revenues									3,994	1,738	1,371
Cost of home sales									2,887	582	331
Financial services | Consolidating Adjustments
Condensed Financial Statements Captions [Line Items]
Revenues									0	0	0
Cost of home sales									$ 0	$ 0	$ 0