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, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Movement in Liability for Future Policy Benefits [Roll Forward]
Balance at beginning of period	$ 63,881	$ 56,817	$ 60,415	$ 55,308
Expense provisions	4,058	3,102	10,562	8,312
Cash payments, net of recoveries	(859)	(2,614)	(3,897)	(6,315)
Balance at end of period	$ 67,080	$ 57,305	$ 67,080	$ 57,305