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Investments in Unconsolidated Joint Ventures - Narrative (Details) ft² in Thousands, $ in Thousands							3 Months Ended		9 Months Ended
	Sep. 18, 2017 USD ($)	Mar. 17, 2017 USD ($)	Mar. 28, 2016 USD ($)	Mar. 01, 2016 USD ($) ft²	Jan. 14, 2016 USD ($) ft²	Jan. 06, 2016 USD ($) ft²	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)
Investments in unconsolidated joint ventures:
Gain on sale or write down of assets, net							$ (11,854)	$ (19,321)	$ 37,234	$ 426,050
Joint Venture | Country Club Plaza
Investments in unconsolidated joint ventures:
Property area (in square feet) | ft²				1,001
Ownership percentage owned (percent)				50.00%
Purchase price				$ 660,000
Purchase price paid through assumption of debt by the Company			$ 320,000	$ 330,000
Effective interest rate			3.88%
Country Club Plaza | Office building
Investments in unconsolidated joint ventures:
Gain on sale of building		$ 2,290
Country Club Plaza | Joint Venture | Office building
Investments in unconsolidated joint ventures:
Proceeds from sale of building		78,000
Gain on sale of building		$ 4,580
Fashion District Philadelphia | Office building
Investments in unconsolidated joint ventures:
Gain on sale of building	$ 6,713
Fashion District Philadelphia | Joint Venture | Office building
Investments in unconsolidated joint ventures:
Proceeds from sale of building	61,500
Gain on sale of building	$ 13,426
Arrowhead Towne Center
Investments in unconsolidated joint ventures:
Ownership interest						40.00%
Property area (in square feet) | ft²						1,197
Proceeds from sale						$ 289,496
Cash proceeds from sale of business						129,496
Debt proceeds from sale of business						160,000
Arrowhead Towne Center | Joint Venture
Investments in unconsolidated joint ventures:
Ownership interest								40.00%		40.00%
Gain on sale or write down of assets, net						$ 101,629
MAC Heitman Portfolio | Joint Venture
Investments in unconsolidated joint ventures:
Ownership interest					49.00%			49.00%		49.00%
Proceeds from sale					$ 771,478
Gain on sale or write down of assets, net					340,734
Cash proceeds from sale of business					478,608
Debt proceeds from sale of business					$ 292,870
MAC Heitman Portfolio | Deptford Mall | Joint Venture
Investments in unconsolidated joint ventures:
Property area (in square feet) | ft²					1,040
MAC Heitman Portfolio | FlatIron Crossing | Joint Venture
Investments in unconsolidated joint ventures:
Property area (in square feet) | ft²					1,432
MAC Heitman Portfolio | Twenty Ninth Street | Joint Venture
Investments in unconsolidated joint ventures:
Property area (in square feet) | ft²					847

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