Segment Reporting - Reconciliation of Revenue From Segments to Consolidated (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Homebuilding:
Segment Reporting Information [Line Items]
Total financial services revenues	$ 1,257,701	$ 1,000,549	$ 3,667,332	$ 2,584,392
Homebuilding: | West
Segment Reporting Information [Line Items]
Total financial services revenues	729,777	552,319	2,194,071	1,447,934
Homebuilding: | Mountain
Segment Reporting Information [Line Items]
Total financial services revenues	379,041	347,095	1,104,391	886,619
Homebuilding: | East
Segment Reporting Information [Line Items]
Total financial services revenues	148,883	101,135	368,870	249,839
Financial Services:
Segment Reporting Information [Line Items]
Total financial services revenues	43,104	36,803	121,445	91,653
Financial Services: | West
Segment Reporting Information [Line Items]
Total financial services revenues	43,104	36,803	121,445	91,653
Financial Services: | Mortgage operations
Segment Reporting Information [Line Items]
Total financial services revenues	31,122	28,548	89,608	67,536
Financial Services: | Other
Segment Reporting Information [Line Items]
Total financial services revenues	$ 11,982	$ 8,255	$ 31,837	$ 24,117