Insurance and Construction Defect Claim Reserves - Summary of Insurance and Defect Claim Reserves Activity (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Movement in Liability for Future Policy Benefits [Roll Forward]
Balance at beginning of period	$ 76,286	$ 63,881	$ 70,054	$ 60,415
Expense provisions	4,776	4,058	14,447	10,562
Cash payments, net of recoveries	(2,063)	(859)	(5,502)	(3,897)
Balance at end of period	$ 78,999	$ 67,080	$ 78,999	$ 67,080