Organization (Details) ft² in Millions	9 Months Ended
	Sep. 30, 2019 ft² joint_venture property	Sep. 30, 2018 ft² joint_venture property
Entity Information [Line Items]
Number of operating real estate joint ventures | joint_venture	1
Corporate Joint Venture
Entity Information [Line Items]
Number of retail properties | joint_venture		1
Area of real estate | ft²	2.6	3.0
Number of managed assets | property	11	14
Retail
Entity Information [Line Items]
Area of real estate | ft²	9.3	10.5
Retail
Entity Information [Line Items]
Number of retail properties | property	57	63