Segment Reporting - Reconciliation of Revenue From Segments to Consolidated (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Homebuilding:
Segment Reporting Information [Line Items]
Total financial services revenues	$ 1,041,858	$ 697,085
Homebuilding: | West
Segment Reporting Information [Line Items]
Total financial services revenues	616,611	405,498
Homebuilding: | Mountain
Segment Reporting Information [Line Items]
Total financial services revenues	324,717	222,858
Homebuilding: | East
Segment Reporting Information [Line Items]
Total financial services revenues	100,530	68,729
Financial Services: | West
Segment Reporting Information [Line Items]
Total financial services revenues	45,023	21,886
Financial Services: | Mortgage operations
Segment Reporting Information [Line Items]
Total financial services revenues	35,165	14,625
Financial Services: | Other
Segment Reporting Information [Line Items]
Total financial services revenues	$ 9,858	$ 7,261