Investments in Unconsolidated Joint Ventures - Additional Information (Detail)			6 Months Ended	12 Months Ended
	Nov. 03, 2017 USD ($) Property	Jul. 12, 2017 USD ($) Property	Dec. 31, 2015 USD ($)	Dec. 31, 2017 USD ($) Property	Dec. 31, 2016 USD ($)
Schedule Of Equity Method Investments [Line Items]
Net proceeds from disposition of interest in unconsolidated joint venture		$ 247,600,000		$ 257,373,000
Number of properties | Property				23
Gain on sale of interest in unconsolidated joint venture				$ 60,302,000
Gain on sale of real estate				11,447,000
Cash proceeds from closing costs, to used redevelopment pipelines		171,600,000
Joint venture impairment charges			$ 0	$ 0	$ 0
Mortgage Loans [Member]
Schedule Of Equity Method Investments [Line Items]
Reduction of amounts outstanding under mortgage loan		(50,600,000)
General Growth Properties, Inc. I [Member]
Schedule Of Equity Method Investments [Line Items]
Net proceeds from disposition of interest in unconsolidated joint venture		$ 190,100,000
Percentage of interest sold		50.00%
Number of joint venture properties sold | Property		8
Number of properties | Property		12		4
Gain on sale of interest in unconsolidated joint venture		$ 43,700,000
General Growth Properties, Inc. II [Member]
Schedule Of Equity Method Investments [Line Items]
Number of properties | Property				5
Number of wholly owned properties contributed | Property		5
New JV Properties [Member]
Schedule Of Equity Method Investments [Line Items]
Net proceeds from disposition of interest in unconsolidated joint venture		$ 57,500,000
Percentage of interest sold		50.00%
Gain on sale of real estate		$ 11,500,000
Simon Property Group Inc [Member]
Schedule Of Equity Method Investments [Line Items]
Net proceeds from disposition of interest in unconsolidated joint venture	$ 68,000,000
Percentage of interest sold	50.00%
Number of joint venture properties sold | Property	5
Number of properties | Property	10			5
Gain on sale of interest in unconsolidated joint venture	$ 16,600,000