Homebuilding Accrued Liabilities and Financial Services Accounts Payable and Accrued Liabilities - Financial Services Accounts Payable and Accrued Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Insurance reserves	$ 67,080	$ 63,881	$ 60,415	$ 57,305	$ 56,817	$ 55,308
Financial Services:
Segment Reporting Information [Line Items]
Insurance reserves	58,601		52,219
Accounts payable and other accrued liabilities	25,567		16,310
Total accounts payable and accrued liabilities	$ 84,168		$ 68,529