Segment Reporting - Reconciliation of Pretax Operating Income From Segments to Consolidated (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Segment Reporting Information [Line Items]
Income before income taxes	$ 144,312	$ 48,562
Homebuilding:
Segment Reporting Information [Line Items]
Income before income taxes	113,507	49,669
Financial Services:
Segment Reporting Information [Line Items]
Income before income taxes	30,805	(1,107)
Operating Segments | Homebuilding: | West
Segment Reporting Information [Line Items]
Income before income taxes	77,187	36,576
Operating Segments | Homebuilding: | Mountain
Segment Reporting Information [Line Items]
Income before income taxes	45,858	21,512
Operating Segments | Homebuilding: | East
Segment Reporting Information [Line Items]
Income before income taxes	7,835	900
Operating Segments | Financial Services: | Mortgage operations
Segment Reporting Information [Line Items]
Income before income taxes	26,039	8,243
Operating Segments | Financial Services: | Other
Segment Reporting Information [Line Items]
Income before income taxes	4,766	(9,350)
Corporate | Homebuilding:
Segment Reporting Information [Line Items]
Income before income taxes	$ (17,373)	$ (9,319)