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Summary of Significant Accounting Policies - Narrative (Details) ft² in Thousands		3 Months Ended		6 Months Ended
	Mar. 01, 2018 ft²	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) joint_venture	Jun. 30, 2017 USD ($)
Variable Interest Entity [Line Items]
Rental revenue and tenant recoveries		$ 162,900,000	$ 167,900,000	$ 324,600,000	$ 326,100,000
Indirect leasing costs capitalized during period		2,000,000	$ 1,700,000	3,800,000	$ 3,200,000
Future undiscounted minimum lease payments on ground leases		507,959,000		$ 507,959,000
VIE, Primary Beneficiary
Variable Interest Entity [Line Items]
Number of joint ventures meeting VIE definition | joint_venture				4
Number of joint ventures consolidated | joint_venture				3
VIE, Primary Beneficiary | HPP-MAC WSP, LLC
Variable Interest Entity [Line Items]
Ownership Interest	75.00%			75.00%
Equity method investments		$ 190,000,000		$ 190,000,000
Equity method investment agreement, defaulting penalty				$ 25,000,000
VIE, Primary Beneficiary | HPP-MAC WSP, LLC | Macerich, WSP, LLC
Variable Interest Entity [Line Items]
Ownership Interest	25.00%
VIE, Primary Beneficiary | HPP-MAC WSP, LLC | Creative Office Space
Variable Interest Entity [Line Items]
Area of real estate property, retail and entertainment space (in square feet) | ft²	500
VIE, Primary Beneficiary | HPP-MAC WSP, LLC | Retail And Entertainment Space
Variable Interest Entity [Line Items]
Area of real estate property, retail and entertainment space (in square feet) | ft²	100
VIE, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Number of joint ventures not consolidated | joint_venture				1
Ownership Interest				21.00%

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 10
-Section 55
-Paragraph 40
-Subparagraph (Note 3)
-URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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