Segment Reporting - Reconciliation of Pretax Operating Income From Segments to Consolidated (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Income before income taxes	$ 205,542	$ 111,638	$ 349,854	$ 160,200
Homebuilding:
Segment Reporting Information [Line Items]
Income before income taxes	187,509	84,921	301,016	134,590
Financial Services:
Segment Reporting Information [Line Items]
Income before income taxes	18,033	26,717	48,838	25,610
Operating Segments | Homebuilding: | West
Segment Reporting Information [Line Items]
Income before income taxes	132,919	48,745	210,106	85,321
Operating Segments | Homebuilding: | Mountain
Segment Reporting Information [Line Items]
Income before income taxes	64,052	41,807	109,910	63,319
Operating Segments | Homebuilding: | East
Segment Reporting Information [Line Items]
Income before income taxes	10,846	3,073	18,681	3,973
Operating Segments | Financial Services: | Mortgage operations
Segment Reporting Information [Line Items]
Income before income taxes	14,088	17,506	40,127	25,749
Operating Segments | Financial Services: | Other
Segment Reporting Information [Line Items]
Income before income taxes	3,945	9,211	8,711	(139)
Corporate | Homebuilding:
Segment Reporting Information [Line Items]
Income before income taxes	$ (20,308)	$ (8,704)	$ (37,681)	$ (18,023)