Insurance and Construction Defect Claim Reserves - Summary of Insurance and Defect Claim Reserves Activity (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Movement in Liability for Future Policy Benefits [Roll Forward]
Balance at beginning of period	$ 70,054	$ 60,415
Expense provisions	4,283	2,918
Cash payments, net of recoveries	(334)	(1,883)
Balance at end of period	$ 74,003	$ 61,450