Segment Reporting - Reconciliation of Revenue From Segments to Consolidated (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Revenues	$ 1,225,166	$ 1,037,352	$ 919,722	$ 718,971	$ 1,104,468	$ 772,662	$ 751,441	$ 664,682	$ 3,901,211	$ 3,293,253	$ 3,065,216
Homebuilding Segment
Segment Reporting Information [Line Items]
Revenues									3,765,379	3,205,248	2,981,811
Homebuilding Segment | West
Segment Reporting Information [Line Items]
Revenues									2,106,241	1,771,060	1,567,141
Homebuilding Segment | Mountain
Segment Reporting Information [Line Items]
Revenues									1,293,779	1,131,568	1,080,475
Homebuilding Segment | East
Segment Reporting Information [Line Items]
Revenues									365,359	302,620	334,195
Financial Services Segment
Segment Reporting Information [Line Items]
Revenues									135,832	88,005	83,405
Financial Services Segment | Mortgage operations
Segment Reporting Information [Line Items]
Revenues									101,675	55,222	53,476
Financial Services Segment | Other
Segment Reporting Information [Line Items]
Revenues									$ 34,157	$ 32,783	$ 29,929