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Property, net - Narrative (Details) - USD ($) $ in Thousands			3 Months Ended		9 Months Ended
	Jan. 14, 2016	Jan. 06, 2016	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Property, Plant and Equipment [Line Items]
Depreciation expense			$ 68,792	$ 90,540	$ 206,870	$ 271,861
(Loss) gain on sale or write down of assets, net			(19,321)	(3,342)	426,050	(7,078)
Gain (loss) on remeasurement, sale or write down of assets, net			343	(3,573)	343	(3,996)
Adjustment to contingent consideration			2,570		(12,180)
Impairment loss				5,916
Capitola Mall
Property, Plant and Equipment [Line Items]
(Loss) gain on sale or write down of assets, net			24,897		24,897
Mervyn's
Property, Plant and Equipment [Line Items]
(Loss) gain on sale or write down of assets, net			$ (3,058)		(3,066)
Arrowhead Towne Center
Property, Plant and Equipment [Line Items]
Gain (loss) on remeasurement, sale or write down of assets, net		$ (104,259)			$ (104,259)
Ownership interest sold (percent)		40.00%			40.00%
MAC Heitman Portfolio
Property, Plant and Equipment [Line Items]
Gain (loss) on remeasurement, sale or write down of assets, net	$ (340,745)				$ (340,745)
Ownership interest sold (percent)	49.00%				49.00%
Promenade at Casa Grande
Property, Plant and Equipment [Line Items]
Gain (loss) on remeasurement, sale or write down of assets, net					$ 23,335
The Market Place at Flagstaff
Property, Plant and Equipment [Line Items]
Gain (loss) on remeasurement, sale or write down of assets, net					$ 7,188
Flagstaff Mall
Property, Plant and Equipment [Line Items]
Gain (loss) on remeasurement, sale or write down of assets, net				$ 4,078		4,078
Freestanding Store
Property, Plant and Equipment [Line Items]
Gain (loss) on remeasurement, sale or write down of assets, net						$ 4,566

X

- Definition

Represents the amount of gain or loss resulting from either the difference between the carrying value and the sales price or remeasurement of the carrying value of assets during the period, reported by an equity method investment of the entity.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting that was sold by the entity during the period.

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Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 4
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- Definition

The expense recognized in the current period that allocates the cost of nonproduction tangible assets over their useful lives.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 1
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The charge against earnings in the period to reduce the carrying amount of real property to fair value.

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