Segment Reporting - Reconciliation of Revenue From Segments to Consolidated (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Homebuilding:
Segment Reporting Information [Line Items]
Total financial services revenues	$ 1,000,549	$ 750,274	$ 2,584,392	$ 2,130,396
Homebuilding: | West
Segment Reporting Information [Line Items]
Total financial services revenues	552,319	410,414	1,447,934	1,164,502
Homebuilding: | Mountain
Segment Reporting Information [Line Items]
Total financial services revenues	347,095	263,802	886,619	760,470
Homebuilding: | East
Segment Reporting Information [Line Items]
Total financial services revenues	101,135	76,058	249,839	205,424
Financial Services: | West
Segment Reporting Information [Line Items]
Total financial services revenues	36,803	22,388	91,653	58,389
Financial Services: | Mortgage operations
Segment Reporting Information [Line Items]
Total financial services revenues	28,548	14,395	67,536	36,258
Financial Services: | Other
Segment Reporting Information [Line Items]
Total financial services revenues	$ 8,255	$ 7,993	$ 24,117	$ 22,131