Senior Notes, Secured, and Unsecured Indebtedness - Summary of Senior Notes Redemption Prices Percentage (Details) - California Lyon - Senior notes - 6% Senior Notes due 2023	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Redemption price, percentage		106.00%
September 1, 2020
Debt Instrument [Line Items]
Redemption price, percentage	103.00%
September 1, 2021
Debt Instrument [Line Items]
Redemption price, percentage	101.50%
September 1, 2022
Debt Instrument [Line Items]
Redemption price, percentage	100.00%